Disable integration test

Sync integration tests
Introduce workshop module and configure integration-test
2026-03-10 08:11:25 +00:00 · 2024-04-09 17:04:19 +02:00 · 2024-04-09 15:57:44 +02:00 · 2024-04-09 14:56:37 +02:00 · 2024-04-08 07:18:40 +02:00 · 2024-04-06 14:52:39 +02:00
74 changed files with 2525 additions and 59666 deletions
--- a/.github/release.yml
+++ b/.github/release.yml
@@ -3,16 +3,16 @@ changelog:
    labels:
      - "ignore-changelog"
  categories:
+    - title: ":warning: Update considerations and deprecations"
+      labels:
+        - "breaking change"
+        - "deprecation"
    - title: ":rocket: New Error Prone checks and Refaster rules"
      labels:
        - "new feature"
    - title: ":sparkles: Improvements"
      labels:
        - "improvement"
-    - title: ":warning: Update considerations and deprecations"
-      labels:
-        - "breaking change"
-        - "deprecation"
    - title: ":bug: Bug fixes"
      labels:
        - "bug"
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -7,6 +7,7 @@ permissions:
  contents: read
 jobs:
  build:
+    if: github.repository == 'PicnicSupermarket/error-prone-support'
    strategy:
      matrix:
        os: [ ubuntu-22.04 ]
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -13,6 +13,7 @@ permissions:
  contents: read
 jobs:
  analyze:
+    if: github.repository == 'PicnicSupermarket/error-prone-support'
    strategy:
      matrix:
        language: [ java, ruby ]
@@ -39,13 +40,13 @@ jobs:
          java-distribution: temurin
          maven-version: 3.9.6
      - name: Initialize CodeQL
-        uses: github/codeql-action/init@47b3d888fe66b639e431abf22ebca059152f1eea # v3.24.5
+        uses: github/codeql-action/init@1b1aada464948af03b950897e5eb522f92603cc2 # v3.24.9
        with:
          languages: ${{ matrix.language }}
      - name: Perform minimal build
        if: matrix.language == 'java'
        run: mvn -T1C clean package -DskipTests -Dverification.skip
      - name: Perform CodeQL analysis
-        uses: github/codeql-action/analyze@47b3d888fe66b639e431abf22ebca059152f1eea # v3.24.5
+        uses: github/codeql-action/analyze@1b1aada464948af03b950897e5eb522f92603cc2 # v3.24.9
        with:
          category: /language:${{ matrix.language }}
--- a/.github/workflows/deploy-website.yml
+++ b/.github/workflows/deploy-website.yml
@@ -9,6 +9,7 @@ concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
 jobs:
  build:
+    if: github.repository == 'PicnicSupermarket/error-prone-support'
    runs-on: ubuntu-22.04
    steps:
      - name: Install Harden-Runner
@@ -42,12 +43,12 @@ jobs:
        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
        with:
          persist-credentials: false
-      - uses: ruby/setup-ruby@d4526a55538b775af234ba4af27118ed6f8f6677 # v1.172.0
+      - uses: ruby/setup-ruby@5f19ec79cedfadb78ab837f95b87734d0003c899 # v1.173.0
        with:
          working-directory: ./website
          bundler-cache: true
      - name: Configure Github Pages
-        uses: actions/configure-pages@1f0c5cde4bc74cd7e1254d0cb4de8d49e9068c7d # v4.0.0
+        uses: actions/configure-pages@983d7736d9b0ae728b81ab479565c72886d7745b # v5.0.0
      - name: Generate documentation
        run: ./generate-docs.sh
      - name: Build website with Jekyll
@@ -82,4 +83,4 @@ jobs:
            api.github.com:443
      - name: Deploy to GitHub Pages
        id: deployment
-        uses: actions/deploy-pages@decdde0ac072f6dcbe43649d82d9c635fff5b4e4 # v4.0.4
+        uses: actions/deploy-pages@d6db90164ac5ed86f2b6aed7e0febac5b3c0c03e # v4.0.5
--- a/.github/workflows/openssf-scorecard.yml
+++ b/.github/workflows/openssf-scorecard.yml
@@ -14,6 +14,7 @@ permissions:
  contents: read
 jobs:
  analyze:
+    if: github.repository == 'PicnicSupermarket/error-prone-support'
    permissions:
      contents: read
      security-events: write
@@ -46,6 +47,6 @@ jobs:
          results_format: sarif
          publish_results: ${{ github.ref == 'refs/heads/master' }}
      - name: Update GitHub's code scanning dashboard
-        uses: github/codeql-action/upload-sarif@47b3d888fe66b639e431abf22ebca059152f1eea # v3.24.5
+        uses: github/codeql-action/upload-sarif@1b1aada464948af03b950897e5eb522f92603cc2 # v3.24.9
        with:
          sarif_file: results.sarif
--- a/.github/workflows/pitest-analyze-pr.yml
+++ b/.github/workflows/pitest-analyze-pr.yml
@@ -9,6 +9,7 @@ permissions:
  contents: read
 jobs:
  analyze-pr:
+    if: github.repository == 'PicnicSupermarket/error-prone-support'
    runs-on: ubuntu-22.04
    steps:
      - name: Install Harden-Runner
--- a/.github/workflows/pitest-update-pr.yml
+++ b/.github/workflows/pitest-update-pr.yml
@@ -11,7 +11,7 @@ permissions:
  actions: read
 jobs:
  update-pr:
-    if: ${{ github.event.workflow_run.conclusion == 'success' }}
+    if: ${{ github.event.workflow_run.conclusion == 'success' && github.repository == 'PicnicSupermarket/error-prone-support' }}
    permissions:
      actions: read
      checks: write
@@ -35,7 +35,7 @@ jobs:
          java-distribution: temurin
          maven-version: 3.9.6
      - name: Download Pitest analysis artifact
-        uses: dawidd6/action-download-artifact@71072fbb1229e1317f1a8de6b04206afb461bd67 # v3.1.2
+        uses: dawidd6/action-download-artifact@09f2f74827fd3a8607589e5ad7f9398816f540fe # v3.1.4
        with:
          workflow: ${{ github.event.workflow_run.workflow_id }}
          name: pitest-reports
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@
 .DS_Store
 .factorypath
 .idea
+!.idea/icon.svg
 .project
 .settings
 target
--- a/.idea/icon.svg
+++ b/.idea/icon.svg
@@ -0,0 +1,65 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg width="100%" height="100%" viewBox="0 0 1259 1199" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" xmlns:serif="http://www.serif.com/" style="fill-rule:evenodd;clip-rule:evenodd;stroke-linejoin:round;stroke-miterlimit:2;">
+    <g transform="matrix(1,0,0,1,-624.154,-988.431)">
+        <g transform="matrix(1,0,0,1,-70.1122,-35.0561)">
+            <g transform="matrix(1,0,0,1,0,9.81959)">
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+            <g transform="matrix(1,0,0,1,0,9.81959)">
+                <path d="M1576.29,1470.72C1576.29,1481.36 1568.75,1491.56 1555.31,1499.08C1541.88,1506.6 1523.67,1510.83 1504.68,1510.83C1465.12,1510.83 1433.06,1492.87 1433.06,1470.72C1433.06,1448.57 1465.12,1430.62 1504.68,1430.62C1523.67,1430.62 1541.88,1434.84 1555.31,1442.36C1568.75,1449.89 1576.29,1460.09 1576.29,1470.72Z" style="fill:rgb(255,155,173);fill-rule:nonzero;"/>
+            </g>
+            <g transform="matrix(1,0,0,1,0,9.81959)">
+                <path d="M1214.28,1470.72C1214.28,1481.36 1206.73,1491.56 1193.31,1499.08C1179.87,1506.6 1161.66,1510.83 1142.66,1510.83C1103.11,1510.83 1071.05,1492.87 1071.05,1470.72C1071.05,1448.57 1103.11,1430.62 1142.66,1430.62C1161.66,1430.62 1179.87,1434.84 1193.31,1442.36C1206.73,1449.89 1214.28,1460.09 1214.28,1470.72Z" style="fill:rgb(255,155,173);fill-rule:nonzero;"/>
+            </g>
+            <g transform="matrix(1,0,0,1,0,9.81959)">
+                <path d="M1104.39,1401.46C1104.39,1375.15 1118.45,1350.79 1141.24,1337.63C1164.03,1324.48 1192.16,1324.48 1214.95,1337.63C1237.74,1350.79 1251.81,1375.15 1251.81,1401.46L1224.41,1401.46C1224.41,1384.9 1215.6,1369.64 1201.25,1361.36C1186.9,1353.07 1169.29,1353.07 1154.94,1361.36C1140.59,1369.64 1131.78,1384.9 1131.78,1401.46L1104.39,1401.46Z" style="fill:rgb(26,26,26);fill-rule:nonzero;"/>
+            </g>
+            <g transform="matrix(1,0,0,1,0,9.81959)">
+                <path d="M1395.54,1401.46C1395.54,1375.15 1409.61,1350.79 1432.39,1337.63C1455.18,1324.48 1483.32,1324.48 1506.11,1337.63C1528.89,1350.79 1542.96,1375.15 1542.96,1401.46L1515.56,1401.46C1515.56,1384.9 1506.75,1369.64 1492.41,1361.36C1478.06,1353.07 1460.44,1353.07 1446.09,1361.36C1431.74,1369.64 1422.93,1384.9 1422.93,1401.46L1395.54,1401.46Z" style="fill:rgb(26,26,26);fill-rule:nonzero;"/>
+            </g>
+            <g transform="matrix(1,0,0,1,0,9.81959)">
+                <path d="M1256.81,1448.61C1256.81,1472.48 1269.56,1494.57 1290.24,1506.51C1310.92,1518.45 1336.42,1518.45 1357.1,1506.51C1377.78,1494.57 1390.53,1472.48 1390.53,1448.61L1376.83,1448.61C1376.83,1467.61 1366.71,1485.15 1350.25,1494.65C1333.79,1504.15 1313.55,1504.15 1297.09,1494.65C1280.63,1485.15 1270.51,1467.61 1270.51,1448.61L1256.81,1448.61Z" style="fill:rgb(26,26,26);fill-rule:nonzero;"/>
+            </g>
+        </g>
+    </g>
+</svg>
--- a/documentation-support/pom.xml
+++ b/documentation-support/pom.xml
@@ -5,7 +5,7 @@
    <parent>
        <groupId>tech.picnic.error-prone-support</groupId>
        <artifactId>error-prone-support</artifactId>
-        <version>0.16.1</version>
+        <version>0.16.2-SNAPSHOT</version>
    </parent>

    <artifactId>documentation-support</artifactId>
--- a/error-prone-contrib/pom.xml
+++ b/error-prone-contrib/pom.xml
@@ -5,7 +5,7 @@
    <parent>
        <groupId>tech.picnic.error-prone-support</groupId>
        <artifactId>error-prone-support</artifactId>
-        <version>0.16.1</version>
+        <version>0.16.2-SNAPSHOT</version>
    </parent>

    <artifactId>error-prone-contrib</artifactId>
--- a/error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/OptionalOrElse.java
+++ b/error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/OptionalOrElse.java
@@ -0,0 +1,135 @@
+package tech.picnic.errorprone.bugpatterns;
+
+import static com.google.errorprone.BugPattern.LinkType.NONE;
+import static com.google.errorprone.BugPattern.SeverityLevel.WARNING;
+import static com.google.errorprone.BugPattern.StandardTags.PERFORMANCE;
+import static com.google.errorprone.matchers.Matchers.instanceMethod;
+import static com.google.errorprone.matchers.Matchers.staticMethod;
+import static java.util.stream.Collectors.joining;
+
+import com.google.auto.service.AutoService;
+import com.google.common.collect.Iterables;
+import com.google.errorprone.BugPattern;
+import com.google.errorprone.VisitorState;
+import com.google.errorprone.bugpatterns.BugChecker;
+import com.google.errorprone.bugpatterns.BugChecker.MethodInvocationTreeMatcher;
+import com.google.errorprone.fixes.SuggestedFix;
+import com.google.errorprone.fixes.SuggestedFixes;
+import com.google.errorprone.matchers.Description;
+import com.google.errorprone.matchers.Matcher;
+import com.google.errorprone.refaster.Refaster;
+import com.google.errorprone.util.ASTHelpers;
+import com.sun.source.tree.ExpressionTree;
+import com.sun.source.tree.IdentifierTree;
+import com.sun.source.tree.LiteralTree;
+import com.sun.source.tree.MemberSelectTree;
+import com.sun.source.tree.MethodInvocationTree;
+import java.util.Optional;
+import java.util.function.Supplier;
+import tech.picnic.errorprone.utils.SourceCode;
+
+/**
+ * A {@link BugChecker} that flags arguments to {@link Optional#orElse(Object)} that should be
+ * deferred using {@link Optional#orElseGet(Supplier)}.
+ *
+ * <p>The suggested fix assumes that the argument to {@code orElse} does not have side effects. If
+ * it does, the suggested fix changes the program's semantics. Such fragile code must instead be
+ * refactored such that the side-effectful code does not appear accidental.
+ */
+// XXX: Consider also implementing the inverse, in which `.orElseGet(() -> someConstant)` is
+// flagged.
+// XXX: Once the `MethodReferenceUsageCheck` becomes generally usable, consider leaving the method
+// reference cleanup to that check, and express the remainder of the logic in this class using a
+// Refaster template, i.c.w. a `@Matches` constraint that implements the `requiresComputation`
+// logic.
+@AutoService(BugChecker.class)
+@BugPattern(
+    summary =
+        """
+        Prefer `Optional#orElseGet` over `Optional#orElse` if the fallback requires additional \
+        computation""",
+    linkType = NONE,
+    severity = WARNING,
+    tags = PERFORMANCE)
+public final class OptionalOrElse extends BugChecker implements MethodInvocationTreeMatcher {
+  private static final long serialVersionUID = 1L;
+  private static final Matcher<ExpressionTree> OPTIONAL_OR_ELSE_METHOD =
+      instanceMethod().onExactClass(Optional.class.getCanonicalName()).namedAnyOf("orElse");
+  // XXX: Also exclude invocations of `@Placeholder`-annotated methods.
+  private static final Matcher<ExpressionTree> REFASTER_METHOD =
+      staticMethod().onClass(Refaster.class.getCanonicalName());
+
+  /** Instantiates a new {@link OptionalOrElse} instance. */
+  public OptionalOrElse() {}
+
+  @Override
+  public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
+    if (!OPTIONAL_OR_ELSE_METHOD.matches(tree, state)) {
+      return Description.NO_MATCH;
+    }
+
+    ExpressionTree argument = Iterables.getOnlyElement(tree.getArguments());
+    if (!requiresComputation(argument) || REFASTER_METHOD.matches(argument, state)) {
+      return Description.NO_MATCH;
+    }
+
+    /*
+     * We have a match. Construct the method reference or lambda expression to be passed to the
+     * replacement `#orElseGet` invocation.
+     */
+    String newArgument =
+        tryMethodReferenceConversion(argument, state)
+            .orElseGet(() -> "() -> " + SourceCode.treeToString(argument, state));
+
+    /* Construct the suggested fix, replacing the method invocation and its argument. */
+    SuggestedFix fix =
+        SuggestedFix.builder()
+            .merge(SuggestedFixes.renameMethodInvocation(tree, "orElseGet", state))
+            .replace(argument, newArgument)
+            .build();
+
+    return describeMatch(tree, fix);
+  }
+
+  /**
+   * Tells whether the given expression contains anything other than a literal or a (possibly
+   * dereferenced) variable or constant.
+   */
+  private static boolean requiresComputation(ExpressionTree tree) {
+    return !(tree instanceof IdentifierTree
+        || tree instanceof LiteralTree
+        || (tree instanceof MemberSelectTree memberSelect
+            && !requiresComputation(memberSelect.getExpression()))
+        || ASTHelpers.constValue(tree) != null);
+  }
+
+  /** Returns the nullary method reference matching the given expression, if any. */
+  private static Optional<String> tryMethodReferenceConversion(
+      ExpressionTree tree, VisitorState state) {
+    if (!(tree instanceof MethodInvocationTree methodInvocation)) {
+      return Optional.empty();
+    }
+
+    if (!methodInvocation.getArguments().isEmpty()) {
+      return Optional.empty();
+    }
+
+    if (!(methodInvocation.getMethodSelect() instanceof MemberSelectTree memberSelect)) {
+      return Optional.empty();
+    }
+
+    if (requiresComputation(memberSelect.getExpression())) {
+      return Optional.empty();
+    }
+
+    return Optional.of(
+        SourceCode.treeToString(memberSelect.getExpression(), state)
+            + "::"
+            + (methodInvocation.getTypeArguments().isEmpty()
+                ? ""
+                : methodInvocation.getTypeArguments().stream()
+                    .map(arg -> SourceCode.treeToString(arg, state))
+                    .collect(joining(",", "<", ">")))
+            + memberSelect.getIdentifier());
+  }
+}
--- a/error-prone-contrib/src/main/java/tech/picnic/errorprone/refasterrules/CollectionRules.java
+++ b/error-prone-contrib/src/main/java/tech/picnic/errorprone/refasterrules/CollectionRules.java
@@ -39,7 +39,7 @@ final class CollectionRules {
      "java:S1155" /* This violation will be rewritten. */,
      "LexicographicalAnnotationAttributeListing" /* `key-*` entry must remain last. */,
      "OptionalFirstCollectionElement" /* This is a more specific template. */,
-      "StreamIsEmpty" /* This is a more specific template. */,
+      "StreamFindAnyIsEmpty" /* This is a more specific template. */,
      "key-to-resolve-AnnotationUseStyle-and-TrailingComment-check-conflict"
    })
    boolean before(Collection<T> collection) {
--- a/error-prone-contrib/src/main/java/tech/picnic/errorprone/refasterrules/ComparatorRules.java
+++ b/error-prone-contrib/src/main/java/tech/picnic/errorprone/refasterrules/ComparatorRules.java
@@ -16,8 +16,11 @@ import com.google.common.collect.ImmutableSet;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import com.google.errorprone.refaster.Refaster;
 import com.google.errorprone.refaster.annotation.AfterTemplate;
+import com.google.errorprone.refaster.annotation.AlsoNegation;
 import com.google.errorprone.refaster.annotation.BeforeTemplate;
 import com.google.errorprone.refaster.annotation.Matches;
+import com.google.errorprone.refaster.annotation.MayOptionallyUse;
+import com.google.errorprone.refaster.annotation.Placeholder;
 import com.google.errorprone.refaster.annotation.Repeated;
 import com.google.errorprone.refaster.annotation.UseImportPolicy;
 import java.util.Arrays;
@@ -92,6 +95,24 @@ final class ComparatorRules {
    }
  }

+  /** Don't explicitly compare enums by their ordinal. */
+  abstract static class ComparingEnum<E extends Enum<E>, T> {
+    @Placeholder(allowsIdentity = true)
+    abstract E toEnumFunction(@MayOptionallyUse T value);
+
+    @BeforeTemplate
+    @SuppressWarnings("EnumOrdinal" /* This violation will be rewritten. */)
+    Comparator<T> before() {
+      return comparingInt(v -> toEnumFunction(v).ordinal());
+    }
+
+    @AfterTemplate
+    @UseImportPolicy(STATIC_IMPORT_ALWAYS)
+    Comparator<T> after() {
+      return comparing(v -> toEnumFunction(v));
+    }
+  }
+
  /** Don't explicitly create {@link Comparator}s unnecessarily. */
  static final class ThenComparing<S, T extends Comparable<? super T>> {
    @BeforeTemplate
@@ -419,4 +440,34 @@ final class ComparatorRules {
      return maxBy(naturalOrder());
    }
  }
+
+  /** Don't explicitly compare enums by their ordinal. */
+  static final class IsLessThan<E extends Enum<E>> {
+    @BeforeTemplate
+    @SuppressWarnings("EnumOrdinal" /* This violation will be rewritten. */)
+    boolean before(E value1, E value2) {
+      return value1.ordinal() < value2.ordinal();
+    }
+
+    @AfterTemplate
+    @AlsoNegation
+    boolean after(E value1, E value2) {
+      return value1.compareTo(value2) < 0;
+    }
+  }
+
+  /** Don't explicitly compare enums by their ordinal. */
+  static final class IsLessThanOrEqualTo<E extends Enum<E>> {
+    @BeforeTemplate
+    @SuppressWarnings("EnumOrdinal" /* This violation will be rewritten. */)
+    boolean before(E value1, E value2) {
+      return value1.ordinal() <= value2.ordinal();
+    }
+
+    @AfterTemplate
+    @AlsoNegation
+    boolean after(E value1, E value2) {
+      return value1.compareTo(value2) <= 0;
+    }
+  }
 }
--- a/error-prone-contrib/src/main/java/tech/picnic/errorprone/refasterrules/EqualityRules.java
+++ b/error-prone-contrib/src/main/java/tech/picnic/errorprone/refasterrules/EqualityRules.java
@@ -30,8 +30,9 @@ final class EqualityRules {
    // XXX: This Refaster rule is the topic of https://github.com/google/error-prone/issues/559. We
    // work around the issue by selecting the "largest replacements". See the `Refaster` check.
    @BeforeTemplate
+    @SuppressWarnings("EnumOrdinal" /* This violation will be rewritten. */)
    boolean before(T a, T b) {
-      return Refaster.anyOf(a.equals(b), Objects.equals(a, b));
+      return Refaster.anyOf(a.equals(b), Objects.equals(a, b), a.ordinal() == b.ordinal());
    }

    @AfterTemplate
--- a/error-prone-contrib/src/main/java/tech/picnic/errorprone/refasterrules/OptionalRules.java
+++ b/error-prone-contrib/src/main/java/tech/picnic/errorprone/refasterrules/OptionalRules.java
@@ -360,7 +360,7 @@ final class OptionalRules {
  /** Prefer {@link Optional#or(Supplier)} over more verbose alternatives. */
  static final class OptionalOrOtherOptional<T> {
    @BeforeTemplate
-    @SuppressWarnings("NestedOptionals" /* Auto-fix for the `NestedOptionals` check. */)
+    @SuppressWarnings("NestedOptionals")
    Optional<T> before(Optional<T> optional1, Optional<T> optional2) {
      // XXX: Note that rewriting the first and third variant will change the code's behavior if
      // `optional2` has side-effects.
@@ -386,9 +386,13 @@ final class OptionalRules {
   */
  static final class OptionalIdentity<T> {
    @BeforeTemplate
+    @SuppressWarnings("NestedOptionals")
    Optional<T> before(Optional<T> optional, Comparator<? super T> comparator) {
      return Refaster.anyOf(
          optional.or(Refaster.anyOf(() -> Optional.empty(), Optional::empty)),
+          optional
+              .map(Optional::of)
+              .orElseGet(Refaster.anyOf(() -> Optional.empty(), Optional::empty)),
          optional.stream().findFirst(),
          optional.stream().findAny(),
          optional.stream().min(comparator),
@@ -442,9 +446,7 @@ final class OptionalRules {
  static final class OptionalStream<T> {
    @BeforeTemplate
    Stream<T> before(Optional<T> optional) {
-      return Refaster.anyOf(
-          optional.map(Stream::of).orElse(Stream.empty()),
-          optional.map(Stream::of).orElseGet(Stream::empty));
+      return optional.map(Stream::of).orElseGet(Stream::empty);
    }

    @AfterTemplate
--- a/error-prone-contrib/src/main/java/tech/picnic/errorprone/refasterrules/StreamRules.java
+++ b/error-prone-contrib/src/main/java/tech/picnic/errorprone/refasterrules/StreamRules.java
@@ -25,6 +25,7 @@ import com.google.common.collect.Streams;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import com.google.errorprone.refaster.Refaster;
 import com.google.errorprone.refaster.annotation.AfterTemplate;
+import com.google.errorprone.refaster.annotation.AlsoNegation;
 import com.google.errorprone.refaster.annotation.BeforeTemplate;
 import com.google.errorprone.refaster.annotation.Matches;
 import com.google.errorprone.refaster.annotation.MayOptionallyUse;
@@ -256,7 +257,7 @@ final class StreamRules {
  // XXX: This rule assumes that any matched `Collector` does not perform any filtering.
  // (Perhaps we could add a `@Matches` guard that validates that the collector expression does not
  // contain a `Collectors#filtering` call. That'd still not be 100% accurate, though.)
-  static final class StreamIsEmpty<T, K, V, C extends Collection<K>, M extends Map<K, V>> {
+  static final class StreamFindAnyIsEmpty<T, K, V, C extends Collection<K>, M extends Map<K, V>> {
    @BeforeTemplate
    boolean before(Stream<T> stream, Collector<? super T, ?, ? extends C> collector) {
      return Refaster.anyOf(
@@ -274,20 +275,20 @@ final class StreamRules {
    }

    @AfterTemplate
+    @AlsoNegation
    boolean after(Stream<T> stream) {
      return stream.findAny().isEmpty();
    }
  }

-  /** In order to test whether a stream has any element, simply try to find one. */
-  static final class StreamIsNotEmpty<T> {
+  /**
+   * Prefer {@link Stream#findAny()} over {@link Stream#findFirst()} if one only cares whether the
+   * stream is nonempty.
+   */
+  static final class StreamFindAnyIsPresent<T> {
    @BeforeTemplate
    boolean before(Stream<T> stream) {
-      return Refaster.anyOf(
-          stream.count() != 0,
-          stream.count() > 0,
-          stream.count() >= 1,
-          stream.findFirst().isPresent());
+      return stream.findFirst().isPresent();
    }

    @AfterTemplate
--- a/error-prone-contrib/src/test/java/tech/picnic/errorprone/bugpatterns/OptionalOrElseTest.java
+++ b/error-prone-contrib/src/test/java/tech/picnic/errorprone/bugpatterns/OptionalOrElseTest.java
@@ -0,0 +1,135 @@
+package tech.picnic.errorprone.bugpatterns;
+
+import com.google.errorprone.BugCheckerRefactoringTestHelper;
+import com.google.errorprone.BugCheckerRefactoringTestHelper.TestMode;
+import com.google.errorprone.CompilationTestHelper;
+import org.junit.jupiter.api.Test;
+
+final class OptionalOrElseTest {
+  @Test
+  void identification() {
+    CompilationTestHelper.newInstance(OptionalOrElse.class, getClass())
+        .addSourceLines(
+            "A.java",
+            "import com.google.errorprone.refaster.Refaster;",
+            "import java.util.Optional;",
+            "",
+            "class A {",
+            "  private final Optional<Object> optional = Optional.empty();",
+            "  private final String string = optional.toString();",
+            "",
+            "  void m() {",
+            "    Optional.empty().orElse(null);",
+            "    optional.orElse(null);",
+            "    optional.orElse(\"constant\");",
+            "    optional.orElse(\"constant\" + 0);",
+            "    optional.orElse(Boolean.TRUE);",
+            "    optional.orElse(string);",
+            "    optional.orElse(this.string);",
+            "    optional.orElse(Refaster.anyOf(\"constant\", \"another\"));",
+            "",
+            "    // BUG: Diagnostic contains:",
+            "    Optional.empty().orElse(string + \"constant\");",
+            "    // BUG: Diagnostic contains:",
+            "    optional.orElse(string + \"constant\");",
+            "    // BUG: Diagnostic contains:",
+            "    optional.orElse(\"constant\".toString());",
+            "    // BUG: Diagnostic contains:",
+            "    optional.orElse(string.toString());",
+            "    // BUG: Diagnostic contains:",
+            "    optional.orElse(this.string.toString());",
+            "    // BUG: Diagnostic contains:",
+            "    optional.orElse(String.valueOf(42));",
+            "    // BUG: Diagnostic contains:",
+            "    optional.orElse(string.toString().length());",
+            "    // BUG: Diagnostic contains:",
+            "    optional.orElse(\"constant\".equals(string));",
+            "    // BUG: Diagnostic contains:",
+            "    optional.orElse(string.equals(string));",
+            "    // BUG: Diagnostic contains:",
+            "    optional.orElse(this.string.equals(string));",
+            "    // BUG: Diagnostic contains:",
+            "    optional.orElse(foo());",
+            "    // BUG: Diagnostic contains:",
+            "    optional.orElse(this.foo());",
+            "    // BUG: Diagnostic contains:",
+            "    optional.orElse(new Object() {});",
+            "    // BUG: Diagnostic contains:",
+            "    optional.orElse(new int[0].length);",
+            "  }",
+            "",
+            "  private <T> T foo() {",
+            "    return null;",
+            "  }",
+            "}")
+        .doTest();
+  }
+
+  @Test
+  void replacement() {
+    BugCheckerRefactoringTestHelper.newInstance(OptionalOrElse.class, getClass())
+        .addInputLines(
+            "A.java",
+            "import java.util.Optional;",
+            "",
+            "class A {",
+            "  private final Optional<Object> optional = Optional.empty();",
+            "  private final String string = optional.toString();",
+            "",
+            "  void m() {",
+            "    optional.orElse(string + \"constant\");",
+            "    optional.orElse(\"constant\".toString());",
+            "    optional.orElse(string.toString());",
+            "    optional.orElse(this.string.toString());",
+            "    optional.orElse(String.valueOf(42));",
+            "    optional.orElse(string.toString().length());",
+            "    optional.orElse(string.equals(string));",
+            "    optional.orElse(foo());",
+            "    optional.orElse(this.<Number>foo());",
+            "    optional.orElse(this.<String, Integer>bar());",
+            "    optional.orElse(new Object() {});",
+            "    optional.orElse(new int[0].length);",
+            "  }",
+            "",
+            "  private <T> T foo() {",
+            "    return null;",
+            "  }",
+            "",
+            "  private <S, T> T bar() {",
+            "    return null;",
+            "  }",
+            "}")
+        .addOutputLines(
+            "A.java",
+            "import java.util.Optional;",
+            "",
+            "class A {",
+            "  private final Optional<Object> optional = Optional.empty();",
+            "  private final String string = optional.toString();",
+            "",
+            "  void m() {",
+            "    optional.orElseGet(() -> string + \"constant\");",
+            "    optional.orElseGet(\"constant\"::toString);",
+            "    optional.orElseGet(string::toString);",
+            "    optional.orElseGet(this.string::toString);",
+            "    optional.orElseGet(() -> String.valueOf(42));",
+            "    optional.orElseGet(() -> string.toString().length());",
+            "    optional.orElseGet(() -> string.equals(string));",
+            "    optional.orElseGet(() -> foo());",
+            "    optional.orElseGet(this::<Number>foo);",
+            "    optional.orElseGet(this::<String, Integer>bar);",
+            "    optional.orElseGet(() -> new Object() {});",
+            "    optional.orElseGet(() -> new int[0].length);",
+            "  }",
+            "",
+            "  private <T> T foo() {",
+            "    return null;",
+            "  }",
+            "",
+            "  private <S, T> T bar() {",
+            "    return null;",
+            "  }",
+            "}")
+        .doTest(TestMode.TEXT_MATCH);
+  }
+}
--- a/error-prone-contrib/src/test/java/tech/picnic/errorprone/bugpatterns/Slf4jLogStatementTest.java
+++ b/error-prone-contrib/src/test/java/tech/picnic/errorprone/bugpatterns/Slf4jLogStatementTest.java
@@ -19,7 +19,6 @@ final class Slf4jLogStatementTest {
            "class A {",
            "  private static final String FMT0 = \"format-string-without-placeholders\";",
            "  private static final String FMT1 = \"format-string-with-{}-placeholder\";",
-            "  private static final String FMT2 = \"format-string-with-{}-{}-placeholders\";",
            "  private static final String FMT_ERR = \"format-string-with-%s-placeholder\";",
            "  private static final Logger LOG = LoggerFactory.getLogger(A.class);",
            "",
--- a/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/ComparatorRulesTestInput.java
+++ b/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/ComparatorRulesTestInput.java
@@ -9,6 +9,7 @@ import static java.util.stream.Collectors.minBy;
 import com.google.common.collect.Comparators;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
+import java.math.RoundingMode;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.Comparator;
@@ -54,6 +55,10 @@ final class ComparatorRulesTest implements RefasterRuleCollectionTestCase {
        Comparator.comparing(s -> "foo", Comparator.comparingInt(String::length)));
  }

+  Comparator<String> testComparingEnum() {
+    return Comparator.comparingInt(s -> RoundingMode.valueOf(s).ordinal());
+  }
+
  Comparator<String> testThenComparing() {
    return Comparator.<String>naturalOrder().thenComparing(Comparator.comparing(String::isEmpty));
  }
@@ -173,4 +178,16 @@ final class ComparatorRulesTest implements RefasterRuleCollectionTestCase {
  Collector<Integer, ?, Optional<Integer>> testMaxByNaturalOrder() {
    return minBy(reverseOrder());
  }
+
+  ImmutableSet<Boolean> testIsLessThan() {
+    return ImmutableSet.of(
+        RoundingMode.UP.ordinal() < RoundingMode.DOWN.ordinal(),
+        RoundingMode.UP.ordinal() >= RoundingMode.DOWN.ordinal());
+  }
+
+  ImmutableSet<Boolean> testIsLessThanOrEqualTo() {
+    return ImmutableSet.of(
+        RoundingMode.UP.ordinal() <= RoundingMode.DOWN.ordinal(),
+        RoundingMode.UP.ordinal() > RoundingMode.DOWN.ordinal());
+  }
 }
--- a/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/ComparatorRulesTestOutput.java
+++ b/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/ComparatorRulesTestOutput.java
@@ -1,5 +1,6 @@
 package tech.picnic.errorprone.refasterrules;

+import static java.util.Comparator.comparing;
 import static java.util.Comparator.naturalOrder;
 import static java.util.Comparator.reverseOrder;
 import static java.util.function.Function.identity;
@@ -9,6 +10,7 @@ import static java.util.stream.Collectors.minBy;
 import com.google.common.collect.Comparators;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
+import java.math.RoundingMode;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.Comparator;
@@ -52,6 +54,10 @@ final class ComparatorRulesTest implements RefasterRuleCollectionTestCase {
        Comparator.comparing(s -> "foo", Comparator.comparingInt(String::length)));
  }

+  Comparator<String> testComparingEnum() {
+    return comparing(s -> RoundingMode.valueOf(s));
+  }
+
  Comparator<String> testThenComparing() {
    return Comparator.<String>naturalOrder().thenComparing(String::isEmpty);
  }
@@ -163,4 +169,16 @@ final class ComparatorRulesTest implements RefasterRuleCollectionTestCase {
  Collector<Integer, ?, Optional<Integer>> testMaxByNaturalOrder() {
    return maxBy(naturalOrder());
  }
+
+  ImmutableSet<Boolean> testIsLessThan() {
+    return ImmutableSet.of(
+        RoundingMode.UP.compareTo(RoundingMode.DOWN) < 0,
+        RoundingMode.UP.compareTo(RoundingMode.DOWN) >= 0);
+  }
+
+  ImmutableSet<Boolean> testIsLessThanOrEqualTo() {
+    return ImmutableSet.of(
+        RoundingMode.UP.compareTo(RoundingMode.DOWN) <= 0,
+        RoundingMode.UP.compareTo(RoundingMode.DOWN) > 0);
+  }
 }
--- a/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/EqualityRulesTestInput.java
+++ b/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/EqualityRulesTestInput.java
@@ -21,8 +21,10 @@ final class EqualityRulesTest implements RefasterRuleCollectionTestCase {
    return ImmutableSet.of(
        RoundingMode.UP.equals(RoundingMode.DOWN),
        Objects.equals(RoundingMode.UP, RoundingMode.DOWN),
+        RoundingMode.UP.ordinal() == RoundingMode.DOWN.ordinal(),
        !RoundingMode.UP.equals(RoundingMode.DOWN),
-        !Objects.equals(RoundingMode.UP, RoundingMode.DOWN));
+        !Objects.equals(RoundingMode.UP, RoundingMode.DOWN),
+        RoundingMode.UP.ordinal() != RoundingMode.DOWN.ordinal());
  }

  boolean testEqualsPredicate() {
--- a/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/EqualityRulesTestOutput.java
+++ b/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/EqualityRulesTestOutput.java
@@ -21,6 +21,8 @@ final class EqualityRulesTest implements RefasterRuleCollectionTestCase {
    return ImmutableSet.of(
        RoundingMode.UP == RoundingMode.DOWN,
        RoundingMode.UP == RoundingMode.DOWN,
+        RoundingMode.UP == RoundingMode.DOWN,
+        RoundingMode.UP != RoundingMode.DOWN,
        RoundingMode.UP != RoundingMode.DOWN,
        RoundingMode.UP != RoundingMode.DOWN);
  }
--- a/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/OptionalRulesTestInput.java
+++ b/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/OptionalRulesTestInput.java
@@ -120,10 +120,12 @@ final class OptionalRulesTest implements RefasterRuleCollectionTestCase {
    return ImmutableSet.of(
        Optional.of("foo").or(() -> Optional.empty()),
        Optional.of("bar").or(Optional::empty),
-        Optional.of("baz").stream().findFirst(),
-        Optional.of("qux").stream().findAny(),
-        Optional.of("quux").stream().min(String::compareTo),
-        Optional.of("quuz").stream().max(String::compareTo));
+        Optional.of("baz").map(Optional::of).orElseGet(() -> Optional.empty()),
+        Optional.of("qux").map(Optional::of).orElseGet(Optional::empty),
+        Optional.of("quux").stream().findFirst(),
+        Optional.of("quuz").stream().findAny(),
+        Optional.of("corge").stream().min(String::compareTo),
+        Optional.of("grault").stream().max(String::compareTo));
  }

  ImmutableSet<Optional<String>> testOptionalFilter() {
@@ -136,9 +138,7 @@ final class OptionalRulesTest implements RefasterRuleCollectionTestCase {
    return Optional.of(1).stream().map(String::valueOf).findAny();
  }

-  ImmutableSet<Stream<String>> testOptionalStream() {
-    return ImmutableSet.of(
-        Optional.of("foo").map(Stream::of).orElse(Stream.empty()),
-        Optional.of("bar").map(Stream::of).orElseGet(Stream::empty));
+  Stream<String> testOptionalStream() {
+    return Optional.of("foo").map(Stream::of).orElseGet(Stream::empty);
  }
 }
--- a/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/OptionalRulesTestOutput.java
+++ b/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/OptionalRulesTestOutput.java
@@ -120,7 +120,9 @@ final class OptionalRulesTest implements RefasterRuleCollectionTestCase {
        Optional.of("baz"),
        Optional.of("qux"),
        Optional.of("quux"),
-        Optional.of("quuz"));
+        Optional.of("quuz"),
+        Optional.of("corge"),
+        Optional.of("grault"));
  }

  ImmutableSet<Optional<String>> testOptionalFilter() {
@@ -132,7 +134,7 @@ final class OptionalRulesTest implements RefasterRuleCollectionTestCase {
    return Optional.of(1).map(String::valueOf);
  }

-  ImmutableSet<Stream<String>> testOptionalStream() {
-    return ImmutableSet.of(Optional.of("foo").stream(), Optional.of("bar").stream());
+  Stream<String> testOptionalStream() {
+    return Optional.of("foo").stream();
  }
 }
--- a/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/StreamRulesTestInput.java
+++ b/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/StreamRulesTestInput.java
@@ -120,7 +120,7 @@ final class StreamRulesTest implements RefasterRuleCollectionTestCase {
        Stream.of("bar").map(String::length).findFirst());
  }

-  ImmutableSet<Boolean> testStreamIsEmpty() {
+  ImmutableSet<Boolean> testStreamFindAnyIsEmpty() {
    return ImmutableSet.of(
        Stream.of(1).count() == 0,
        Stream.of(2).count() <= 0,
@@ -131,15 +131,14 @@ final class StreamRulesTest implements RefasterRuleCollectionTestCase {
        Stream.of(7).collect(collectingAndThen(toImmutableList(), ImmutableList::isEmpty)),
        Stream.of(8).collect(collectingAndThen(toImmutableMap(k -> k, v -> v), Map::isEmpty)),
        Stream.of(9)
-            .collect(collectingAndThen(toImmutableMap(k -> k, v -> v), ImmutableMap::isEmpty)));
+            .collect(collectingAndThen(toImmutableMap(k -> k, v -> v), ImmutableMap::isEmpty)),
+        Stream.of(10).count() != 0,
+        Stream.of(11).count() > 0,
+        Stream.of(12).count() >= 1);
  }

-  ImmutableSet<Boolean> testStreamIsNotEmpty() {
-    return ImmutableSet.of(
-        Stream.of(1).count() != 0,
-        Stream.of(2).count() > 0,
-        Stream.of(3).count() >= 1,
-        Stream.of(4).findFirst().isPresent());
+  boolean testStreamFindAnyIsPresent() {
+    return Stream.of(1).findFirst().isPresent();
  }

  ImmutableSet<Optional<String>> testStreamMin() {
--- a/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/StreamRulesTestOutput.java
+++ b/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/StreamRulesTestOutput.java
@@ -121,7 +121,7 @@ final class StreamRulesTest implements RefasterRuleCollectionTestCase {
        Stream.of("bar").findFirst().map(String::length));
  }

-  ImmutableSet<Boolean> testStreamIsEmpty() {
+  ImmutableSet<Boolean> testStreamFindAnyIsEmpty() {
    return ImmutableSet.of(
        Stream.of(1).findAny().isEmpty(),
        Stream.of(2).findAny().isEmpty(),
@@ -131,15 +131,14 @@ final class StreamRulesTest implements RefasterRuleCollectionTestCase {
        Stream.of(6).findAny().isEmpty(),
        Stream.of(7).findAny().isEmpty(),
        Stream.of(8).findAny().isEmpty(),
-        Stream.of(9).findAny().isEmpty());
+        Stream.of(9).findAny().isEmpty(),
+        !Stream.of(10).findAny().isEmpty(),
+        !Stream.of(11).findAny().isEmpty(),
+        !Stream.of(12).findAny().isEmpty());
  }

-  ImmutableSet<Boolean> testStreamIsNotEmpty() {
-    return ImmutableSet.of(
-        Stream.of(1).findAny().isPresent(),
-        Stream.of(2).findAny().isPresent(),
-        Stream.of(3).findAny().isPresent(),
-        Stream.of(4).findAny().isPresent());
+  boolean testStreamFindAnyIsPresent() {
+    return Stream.of(1).findAny().isPresent();
  }

  ImmutableSet<Optional<String>> testStreamMin() {
--- a/error-prone-experimental/pom.xml
+++ b/error-prone-experimental/pom.xml
@@ -5,7 +5,7 @@
    <parent>
        <groupId>tech.picnic.error-prone-support</groupId>
        <artifactId>error-prone-support</artifactId>
-        <version>0.16.1</version>
+        <version>0.16.2-SNAPSHOT</version>
    </parent>

    <artifactId>error-prone-experimental</artifactId>
--- a/error-prone-guidelines/pom.xml
+++ b/error-prone-guidelines/pom.xml
@@ -5,7 +5,7 @@
    <parent>
        <groupId>tech.picnic.error-prone-support</groupId>
        <artifactId>error-prone-support</artifactId>
-        <version>0.16.1</version>
+        <version>0.16.2-SNAPSHOT</version>
    </parent>

    <artifactId>error-prone-guidelines</artifactId>
--- a/error-prone-utils/pom.xml
+++ b/error-prone-utils/pom.xml
@@ -5,7 +5,7 @@
    <parent>
        <groupId>tech.picnic.error-prone-support</groupId>
        <artifactId>error-prone-support</artifactId>
-        <version>0.16.1</version>
+        <version>0.16.2-SNAPSHOT</version>
    </parent>

    <artifactId>error-prone-utils</artifactId>
--- a/integration-tests/checkstyle-expected-changes.patch
+++ b/integration-tests/checkstyle-expected-changes.patch
--- a/integration-tests/checkstyle-expected-warnings.txt
+++ b/integration-tests/checkstyle-expected-warnings.txt
@@ -1,142 +0,0 @@
-src/it/java/com/google/checkstyle/test/chapter7javadoc/rule711generalform/InvalidJavadocPositionTest.java:[35,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/it/java/com/google/checkstyle/test/chapter7javadoc/rule734nonrequiredjavadoc/InvalidJavadocPositionTest.java:[35,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/it/java/com/sun/checkstyle/test/chapter5comments/rule52documentationcomments/InvalidJavadocPositionTest.java:[35,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionAbbreviationAsWordInNameTest.java:[117,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `enum` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionAbbreviationAsWordInNameTest.java:[169,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `interface` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionAbbreviationAsWordInNameTest.java:[91,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `class` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionAnnotationLocationTest.java:[104,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `enum` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionAnnotationLocationTest.java:[39,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `class` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionAnnotationLocationTest.java:[71,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `interface` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionAnonInnerLengthTest.java:[39,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionAvoidEscapedUnicodeCharactersTest.java:[40,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionAvoidNoArgumentSuperConstructorCallTest.java:[41,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionCatchParameterNameTest.java:[166,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `enum` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionCatchParameterNameTest.java:[193,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `interface` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionEqualsAvoidNullTest.java:[39,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that a method named `equals` is already defined in this class or a supertype)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionIllegalInstantiationTest.java:[91,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `interface` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionLambdaBodyLengthTest.java:[39,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionMissingJavadocTypeTest.java:[39,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `class` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionMissingOverrideTest.java:[39,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `class` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionMissingOverrideTest.java:[67,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `interface` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionMultipleStringLiteralsTest.java:[41,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionNeedBracesTest.java:[40,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `do` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionOuterTypeNumberTest.java:[39,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionParameterNumberTest.java:[39,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionSimplifyBooleanExpressionTest.java:[90,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `interface` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionUnnecessarySemicolonAfterTypeMemberDeclarationTest.java:[41,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/it/java/org/checkstyle/suppressionxpathfilter/XpathRegressionUnnecessarySemicolonInTryWithResourcesTest.java:[41,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/DetailAstImplTest.java:[595,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that a method named `toString` is already defined in this class or a supertype)
-src/test/java/com/puppycrawl/tools/checkstyle/PackageNamesLoaderTest.java:[58,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/api/FilterSetTest.java:[49,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that a method named `toString` is already defined in this class or a supertype)
-src/test/java/com/puppycrawl/tools/checkstyle/api/FullIdentTest.java:[41,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that a method named `toString` is already defined in this class or a supertype)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/AvoidEscapedUnicodeCharactersCheckTest.java:[77,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/DescendantTokenCheckTest.java:[39,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/OrderedPropertiesCheckTest.java:[49,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/UniquePropertiesCheckTest.java:[65,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/annotation/AnnotationLocationCheckTest.java:[214,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `class` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/annotation/AnnotationLocationCheckTest.java:[227,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `enum` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/annotation/AnnotationLocationCheckTest.java:[238,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `interface` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/annotation/AnnotationLocationCheckTest.java:[249,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `package` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/annotation/AnnotationUseStyleCheckTest.java:[103,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/blocks/EmptyBlockCheckTest.java:[49,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/blocks/EmptyCatchBlockCheckTest.java:[46,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/blocks/LeftCurlyCheckTest.java:[59,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/blocks/RightCurlyCheckTest.java:[50,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/ArrayTrailingCommaCheckTest.java:[36,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/AvoidDoubleBraceInitializationCheckTest.java:[37,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/AvoidInlineConditionalsCheckTest.java:[36,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/AvoidNoArgumentSuperConstructorCallCheckTest.java:[37,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/CovariantEqualsCheckTest.java:[36,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/DeclarationOrderCheckTest.java:[44,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/DefaultComesLastCheckTest.java:[55,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/ExplicitInitializationCheckTest.java:[36,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/FallThroughCheckTest.java:[38,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/HiddenFieldCheckTest.java:[105,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/IllegalInstantiationCheckTest.java:[48,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/IllegalThrowsCheckTest.java:[37,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/NestedIfDepthCheckTest.java:[37,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/NestedTryDepthCheckTest.java:[36,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/NoArrayTrailingCommaCheckTest.java:[36,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/OverloadMethodsDeclarationOrderCheckTest.java:[37,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/ParameterAssignmentCheckTest.java:[45,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/RequireThisCheckTest.java:[290,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `static` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/RequireThisCheckTest.java:[373,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `for` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/ReturnCountCheckTest.java:[48,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/UnnecessaryParenthesesCheckTest.java:[125,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `return` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/UnnecessaryParenthesesCheckTest.java:[44,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/UnnecessarySemicolonAfterOuterTypeDeclarationCheckTest.java:[40,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/UnnecessarySemicolonAfterTypeMemberDeclarationCheckTest.java:[40,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/UnnecessarySemicolonInEnumerationCheckTest.java:[38,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/coding/UnnecessarySemicolonInTryWithResourcesCheckTest.java:[38,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/design/InterfaceIsTypeCheckTest.java:[37,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/design/MutableExceptionCheckTest.java:[54,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/design/ThrowsCountCheckTest.java:[39,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/imports/ImportControlCheckTest.java:[99,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `null` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/imports/ImportOrderCheckTest.java:[81,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/javadoc/InvalidJavadocPositionCheckTest.java:[59,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/javadoc/JavadocContentLocationCheckTest.java:[57,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/javadoc/JavadocContentLocationCheckTest.java:[75,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `package` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/javadoc/JavadocContentLocationCheckTest.java:[83,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `interface` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/javadoc/JavadocNodeImplTest.java:[30,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that a method named `toString` is already defined in this class or a supertype)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/javadoc/JavadocTagInfoTest.java:[230,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `throws` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/javadoc/JavadocTagInfoTest.java:[294,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `return` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/javadoc/JavadocTagTest.java:[58,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that a method named `toString` is already defined in this class or a supertype)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/javadoc/JavadocTypeCheckTest.java:[83,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `protected` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/javadoc/JavadocTypeCheckTest.java:[89,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `public` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/javadoc/JavadocVariableCheckTest.java:[60,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/javadoc/MissingJavadocTypeCheckTest.java:[118,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `protected` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/javadoc/MissingJavadocTypeCheckTest.java:[126,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `public` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/javadoc/utils/InlineTagUtilTest.java:[38,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that a method named `extractInlineTags` is already defined in this class or a supertype)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/metrics/ClassDataAbstractionCouplingCheckTest.java:[189,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `new` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/metrics/ClassFanOutComplexityCheckTest.java:[188,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `extends` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/metrics/ClassFanOutComplexityCheckTest.java:[196,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `implements` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/metrics/ClassFanOutComplexityCheckTest.java:[266,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `throws` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/naming/AbbreviationAsWordInNameCheckTest.java:[36,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/naming/AccessModifierOptionTest.java:[45,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `case` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/naming/ConstantNameCheckTest.java:[67,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/naming/LocalFinalVariableNameCheckTest.java:[48,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/naming/LocalVariableNameCheckTest.java:[48,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/naming/MethodNameCheckTest.java:[48,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/naming/PackageNameCheckTest.java:[60,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/naming/ParameterNameCheckTest.java:[48,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `catch` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/naming/ParameterNameCheckTest.java:[78,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/naming/PatternVariableNameCheckTest.java:[47,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/naming/TypeNameCheckTest.java:[44,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/regexp/RegexpCheckTest.java:[71,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/regexp/RegexpSinglelineCheckTest.java:[120,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/regexp/RegexpSinglelineJavaCheckTest.java:[195,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/sizes/AnonInnerLengthCheckTest.java:[56,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/sizes/LambdaBodyLengthCheckTest.java:[56,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/sizes/MethodCountCheckTest.java:[106,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `enum` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/sizes/OuterTypeNumberCheckTest.java:[73,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/sizes/ParameterNumberCheckTest.java:[58,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/sizes/RecordComponentNumberCheckTest.java:[62,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/whitespace/EmptyForInitializerPadCheckTest.java:[50,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/whitespace/EmptyForIteratorPadCheckTest.java:[49,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/whitespace/EmptyLineSeparatorCheckTest.java:[51,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/whitespace/FileTabCharacterCheckTest.java:[36,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/whitespace/GenericWhitespaceCheckTest.java:[62,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/whitespace/MethodParamPadCheckTest.java:[50,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/whitespace/NoWhitespaceAfterCheckTest.java:[174,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `synchronized` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/whitespace/NoWhitespaceAfterCheckTest.java:[40,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/whitespace/NoWhitespaceBeforeCaseDefaultColonCheckTest.java:[38,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/whitespace/NoWhitespaceBeforeCheckTest.java:[36,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/whitespace/OperatorWrapCheckTest.java:[39,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/whitespace/ParenPadCheckTest.java:[44,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/whitespace/TypecastParenPadCheckTest.java:[41,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/checks/whitespace/WhitespaceAfterCheckTest.java:[46,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/filters/IntMatchFilterElementTest.java:[45,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that a method named `toString` is already defined in this class or a supertype)
-src/test/java/com/puppycrawl/tools/checkstyle/filters/SeverityMatchFilterTest.java:[36,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/filters/SuppressFilterElementTest.java:[185,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that a method named `equals` is already defined in this class or a supertype)
-src/test/java/com/puppycrawl/tools/checkstyle/filters/SuppressWarningsFilterTest.java:[83,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/filters/SuppressWithNearbyCommentFilterTest.java:[210,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/filters/SuppressionCommentFilterTest.java:[151,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/filters/SuppressionSingleFilterTest.java:[42,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `default` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/grammar/antlr4/Antlr4AstRegressionTest.java:[34,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `package` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/grammar/comments/CommentsTest.java:[53,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that a method named `toString` is already defined in this class or a supertype)
-src/test/java/com/puppycrawl/tools/checkstyle/grammar/java8/DefaultMethodsTest.java:[40,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `switch` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/gui/BaseCellEditorTest.java:[31,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that a method named `toString` is already defined in this class or a supertype)
-src/test/java/com/puppycrawl/tools/checkstyle/utils/CheckUtilTest.java:[71,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that a method named `equals` is already defined in this class or a supertype)
-src/test/java/com/puppycrawl/tools/checkstyle/xpath/XpathQueryGeneratorTest.java:[205,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `package` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/xpath/XpathQueryGeneratorTest.java:[219,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `import` is not a valid identifier)
-src/test/java/com/puppycrawl/tools/checkstyle/xpath/XpathQueryGeneratorTest.java:[265,8] [JUnitMethodDeclaration] This method's name should not redundantly start with `test` (but note that `switch` is not a valid identifier)
--- a/integration-tests/checkstyle.sh
+++ b/integration-tests/checkstyle.sh
@@ -66,21 +66,23 @@ error_prone_patch_flags="${error_prone_shared_flags} -XepPatchLocation:IN_PLACE
     -path "*/META-INF/services/com.google.errorprone.bugpatterns.BugChecker" \
     -not -path "*/error-prone-experimental/*" \
     -not -path "*/error-prone-guidelines/*" \
+     -not -path "*/error-prone-contrib/*" \
     -print0 \
    | xargs -0 "${grep_command}" -hoP '[^.]+$' \
    | paste -s -d ',' -
-)"
+) -XepOpt:Refaster:NamePattern=.*Workshop.*"

 error_prone_validation_flags="${error_prone_shared_flags} -XepDisableAllChecks $(
  find "${error_prone_support_root}" \
     -path "*/META-INF/services/com.google.errorprone.bugpatterns.BugChecker" \
     -not -path "*/error-prone-experimental/*" \
     -not -path "*/error-prone-guidelines/*" \
+     -not -path "*/error-prone-contrib/*" \
     -print0 \
    | xargs -0 "${grep_command}" -hoP '[^.]+$' \
    | "${sed_command}" -r 's,(.*),-Xep:\1:WARN,' \
    | paste -s -d ' ' -
-)"
+) -XepOpt:Refaster:NamePattern=.*Workshop.*"

 echo "Shared build flags: ${shared_build_flags}"
 echo "Error Prone patch flags: ${error_prone_patch_flags}"
@@ -168,6 +170,7 @@ mvn ${shared_build_flags} \
      -Dtest='
        !MetadataGeneratorUtilTest#metadataFilesGenerationAllFiles,
        !XdocsJavaDocsTest#allCheckSectionJavaDocs' \
+      -Dstyle.color=always \
    | tee "${validation_build_log}" \
  || failure=1

@@ -191,12 +194,15 @@ else
  # XXX: This "diff of diffs" also contains vacuous sections, introduced due to
  # line offset differences. Try to omit those from the final output.
  if ! diff -u "${expected_changes}" "${actual_changes}"; then
-    echo 'There are unexpected changes. Inspect the preceding output for details.'
+    echo 'There are unexpected changes.'
+    echo "Inspect the changes here: ${report_directory}/${test_name}-diff-of-diffs-changes.patch"
+    diff -u "${expected_changes}" "${actual_changes}" > "${report_directory}/${test_name}-diff-of-diffs-changes.patch"
    failure=1
  fi
  echo 'Inspecting emitted warnings...'
  if ! diff -u "${expected_warnings}" "${actual_warnings}"; then
-    echo 'Diagnostics output changed. Inspect the preceding output for details.'
+    echo 'Diagnostics output changed.'
+    diff -u "${expected_warnings}" "${actual_warnings}" > "${report_directory}/${test_name}-diff-of-diffs-warnings.patch"
    failure=1
  fi
 fi
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@

    <groupId>tech.picnic.error-prone-support</groupId>
    <artifactId>error-prone-support</artifactId>
-    <version>0.16.1</version>
+    <version>0.16.2-SNAPSHOT</version>
    <packaging>pom</packaging>

    <name>Picnic :: Error Prone Support</name>
@@ -48,11 +48,12 @@
        <module>refaster-runner</module>
        <module>refaster-support</module>
        <module>refaster-test-support</module>
+        <module>workshop</module>
    </modules>

    <scm child.scm.developerConnection.inherit.append.path="false" child.scm.url.inherit.append.path="false">
        <developerConnection>scm:git:git@github.com:PicnicSupermarket/error-prone-support.git</developerConnection>
-        <tag>v0.16.1</tag>
+        <tag>HEAD</tag>
        <url>https://github.com/PicnicSupermarket/error-prone-support</url>
    </scm>
    <issueManagement>
@@ -148,7 +149,7 @@
        <groupId.error-prone>com.google.errorprone</groupId.error-prone>
        <!-- The build timestamp is derived from the most recent commit
        timestamp in support of reproducible builds. -->
-        <project.build.outputTimestamp>2024-03-15T12:02:48Z</project.build.outputTimestamp>
+        <project.build.outputTimestamp>2024-03-15T12:04:44Z</project.build.outputTimestamp>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <!-- Glob pattern identifying Refaster rule definition files. These
        Java classes don't contain "regular" code, and thus require special
@@ -208,16 +209,16 @@
        <version.auto-value>1.10.4</version.auto-value>
        <version.error-prone>${version.error-prone-orig}</version.error-prone>
        <version.error-prone-fork>v${version.error-prone-orig}-picnic-2</version.error-prone-fork>
-        <version.error-prone-orig>2.25.0</version.error-prone-orig>
-        <version.error-prone-slf4j>0.1.22</version.error-prone-slf4j>
+        <version.error-prone-orig>2.26.1</version.error-prone-orig>
+        <version.error-prone-slf4j>0.1.23</version.error-prone-slf4j>
        <version.guava-beta-checker>1.0</version.guava-beta-checker>
        <version.jdk>17</version.jdk>
        <version.maven>3.9.5</version.maven>
        <version.mockito>5.11.0</version.mockito>
        <version.nopen-checker>1.0.1</version.nopen-checker>
-        <version.nullaway>0.10.24</version.nullaway>
+        <version.nullaway>0.10.25</version.nullaway>
        <version.pitest-git>1.1.4</version.pitest-git>
-        <version.rewrite-templating>1.6.2</version.rewrite-templating>
+        <version.rewrite-templating>1.6.3</version.rewrite-templating>
        <version.surefire>3.2.3</version.surefire>
    </properties>

@@ -296,7 +297,7 @@
            <dependency>
                <groupId>com.fasterxml.jackson</groupId>
                <artifactId>jackson-bom</artifactId>
-                <version>2.16.2</version>
+                <version>2.17.0</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
@@ -328,7 +329,7 @@
            <dependency>
                <groupId>com.google.googlejavaformat</groupId>
                <artifactId>google-java-format</artifactId>
-                <version>1.21.0</version>
+                <version>1.22.0</version>
            </dependency>
            <dependency>
                <groupId>com.google.guava</groupId>
@@ -338,7 +339,7 @@
            <dependency>
                <groupId>com.google.guava</groupId>
                <artifactId>guava-bom</artifactId>
-                <version>33.0.0-jre</version>
+                <version>33.1.0-jre</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
@@ -360,7 +361,7 @@
            <dependency>
                <groupId>io.projectreactor</groupId>
                <artifactId>reactor-bom</artifactId>
-                <version>2023.0.3</version>
+                <version>2023.0.4</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
@@ -372,12 +373,12 @@
            <dependency>
                <groupId>io.swagger</groupId>
                <artifactId>swagger-annotations</artifactId>
-                <version>1.6.13</version>
+                <version>1.6.14</version>
            </dependency>
            <dependency>
                <groupId>io.swagger.core.v3</groupId>
                <artifactId>swagger-annotations</artifactId>
-                <version>2.2.20</version>
+                <version>2.2.21</version>
            </dependency>
            <dependency>
                <groupId>jakarta.servlet</groupId>
@@ -407,20 +408,12 @@
            <dependency>
                <groupId>net.bytebuddy</groupId>
                <artifactId>byte-buddy</artifactId>
-                <version>1.14.12</version>
-            </dependency>
-            <!-- Specified so that Renovate will file Maven upgrade PRs, which
-            subsequently will cause `maven-enforcer-plugin` to require that
-            developers build the project using the latest Maven release. -->
-            <dependency>
-                <groupId>org.apache.maven</groupId>
-                <artifactId>maven-plugin-api</artifactId>
-                <version>${version.maven}</version>
+                <version>1.14.13</version>
            </dependency>
            <dependency>
                <groupId>org.aspectj</groupId>
                <artifactId>aspectjweaver</artifactId>
-                <version>1.9.21.1</version>
+                <version>1.9.22</version>
            </dependency>
            <dependency>
                <groupId>org.assertj</groupId>
@@ -466,7 +459,7 @@
            <dependency>
                <groupId>org.mongodb</groupId>
                <artifactId>mongodb-driver-core</artifactId>
-                <version>5.0.0</version>
+                <version>5.0.1</version>
            </dependency>
            <dependency>
                <groupId>org.openrewrite</groupId>
@@ -476,7 +469,7 @@
            <dependency>
                <groupId>org.openrewrite.recipe</groupId>
                <artifactId>rewrite-recipe-bom</artifactId>
-                <version>2.7.1</version>
+                <version>2.9.0</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
@@ -490,26 +483,26 @@
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-framework-bom</artifactId>
-                <version>6.1.4</version>
+                <version>6.1.5</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-test</artifactId>
-                <version>3.2.3</version>
+                <version>3.2.4</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.security</groupId>
                <artifactId>spring-security-bom</artifactId>
-                <version>6.2.2</version>
+                <version>6.2.3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.testng</groupId>
                <artifactId>testng</artifactId>
-                <version>7.9.0</version>
+                <version>7.10.0</version>
            </dependency>
        </dependencies>
    </dependencyManagement>
@@ -520,7 +513,7 @@
                <plugin>
                    <groupId>com.github.ekryd.sortpom</groupId>
                    <artifactId>sortpom-maven-plugin</artifactId>
-                    <version>3.4.0</version>
+                    <version>3.4.1</version>
                    <configuration>
                        <createBackupFile>false</createBackupFile>
                        <encoding>${project.build.sourceEncoding}</encoding>
@@ -577,7 +570,7 @@
                <plugin>
                    <groupId>de.thetaphi</groupId>
                    <artifactId>forbiddenapis</artifactId>
-                    <version>3.6</version>
+                    <version>3.7</version>
                    <configuration>
                        <bundledSignatures>
                            <bundledSignature>jdk-internal</bundledSignature>
@@ -624,7 +617,7 @@
                <plugin>
                    <groupId>io.github.git-commit-id</groupId>
                    <artifactId>git-commit-id-maven-plugin</artifactId>
-                    <version>8.0.1</version>
+                    <version>8.0.2</version>
                    <configuration>
                        <injectAllReactorProjects>true</injectAllReactorProjects>
                        <runOnlyOnce>true</runOnlyOnce>
@@ -891,7 +884,7 @@
                        <dependency>
                            <groupId>com.puppycrawl.tools</groupId>
                            <artifactId>checkstyle</artifactId>
-                            <version>10.14.0</version>
+                            <version>10.15.0</version>
                        </dependency>
                        <dependency>
                            <groupId>io.spring.nohttp</groupId>
@@ -916,7 +909,7 @@
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
-                    <version>3.12.1</version>
+                    <version>3.13.0</version>
                    <configuration>
                        <annotationProcessorPaths>
                            <!-- XXX: Inline and drop the version
@@ -1041,9 +1034,6 @@
                            <requireJavaVersion>
                                <version>${version.jdk}</version>
                            </requireJavaVersion>
-                            <requireMavenVersion>
-                                <version>${version.maven}</version>
-                            </requireMavenVersion>
                            <requireNoRepositories />
                            <requirePluginVersions />
                            <requireUpperBoundDeps />
@@ -1068,7 +1058,7 @@
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-gpg-plugin</artifactId>
-                    <version>3.1.0</version>
+                    <version>3.2.2</version>
                    <executions>
                        <execution>
                            <id>sign-artifacts</id>
@@ -1170,7 +1160,7 @@
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-source-plugin</artifactId>
-                    <version>3.3.0</version>
+                    <version>3.3.1</version>
                    <executions>
                        <execution>
                            <id>generate-source-jar</id>
@@ -1382,7 +1372,7 @@
                <plugin>
                    <groupId>org.jacoco</groupId>
                    <artifactId>jacoco-maven-plugin</artifactId>
-                    <version>0.8.11</version>
+                    <version>0.8.12</version>
                    <configuration>
                        <excludes>
                            <!-- Refaster rules are tested using a custom method
@@ -1394,7 +1384,7 @@
                <plugin>
                    <groupId>org.kordamp.maven</groupId>
                    <artifactId>pomchecker-maven-plugin</artifactId>
-                    <version>1.10.0</version>
+                    <version>1.11.0</version>
                    <configuration>
                        <failOnError>false</failOnError>
                        <release>false</release>
@@ -1466,7 +1456,7 @@
                <plugin>
                    <groupId>org.sonarsource.scanner.maven</groupId>
                    <artifactId>sonar-maven-plugin</artifactId>
-                    <version>3.10.0.2594</version>
+                    <version>3.11.0.3922</version>
                </plugin>
            </plugins>
        </pluginManagement>
--- a/refaster-compiler/pom.xml
+++ b/refaster-compiler/pom.xml
@@ -5,7 +5,7 @@
    <parent>
        <groupId>tech.picnic.error-prone-support</groupId>
        <artifactId>error-prone-support</artifactId>
-        <version>0.16.1</version>
+        <version>0.16.2-SNAPSHOT</version>
    </parent>

    <artifactId>refaster-compiler</artifactId>
--- a/refaster-runner/pom.xml
+++ b/refaster-runner/pom.xml
@@ -5,7 +5,7 @@
    <parent>
        <groupId>tech.picnic.error-prone-support</groupId>
        <artifactId>error-prone-support</artifactId>
-        <version>0.16.1</version>
+        <version>0.16.2-SNAPSHOT</version>
    </parent>

    <artifactId>refaster-runner</artifactId>
--- a/refaster-runner/src/main/java/tech/picnic/errorprone/refaster/runner/Refaster.java
+++ b/refaster-runner/src/main/java/tech/picnic/errorprone/refaster/runner/Refaster.java
@@ -166,7 +166,7 @@ public final class Refaster extends BugChecker implements CompilationUnitTreeMat
            "Refaster Rule",
            description.getLink(),
            String.join(": ", description.checkName, description.getRawMessage()))
-        .overrideSeverity(severityOverride.orElse(description.severity()))
+        .overrideSeverity(severityOverride.orElseGet(description::severity))
        .addAllFixes(description.fixes)
        .build();
  }
--- a/refaster-support/pom.xml
+++ b/refaster-support/pom.xml
@@ -5,7 +5,7 @@
    <parent>
        <groupId>tech.picnic.error-prone-support</groupId>
        <artifactId>error-prone-support</artifactId>
-        <version>0.16.1</version>
+        <version>0.16.2-SNAPSHOT</version>
    </parent>

    <artifactId>refaster-support</artifactId>
--- a/refaster-test-support/pom.xml
+++ b/refaster-test-support/pom.xml
@@ -5,7 +5,7 @@
    <parent>
        <groupId>tech.picnic.error-prone-support</groupId>
        <artifactId>error-prone-support</artifactId>
-        <version>0.16.1</version>
+        <version>0.16.2-SNAPSHOT</version>
    </parent>

    <artifactId>refaster-test-support</artifactId>
--- a/website/_data/compatibility.yml
+++ b/website/_data/compatibility.yml
@@ -1,8 +1,36 @@
 # An overview of Error Prone Support releases, along with compatible Error
 # Prone releases. This data was generated by `generate-version-compatibility-overview.sh`.
 releases:
+  - version: 0.16.1
+    compatible:
+      - "2.26.1"
+      - "2.26.0"
+      - "2.25.0"
+      - "2.24.1"
+      - "2.24.0"
+      - "2.23.0"
+  - version: 0.16.0
+    compatible:
+      - "2.26.1"
+      - "2.26.0"
+      - "2.25.0"
+      - "2.24.1"
+      - "2.24.0"
+      - "2.23.0"
+  - version: 0.15.0
+    compatible:
+      - "2.26.1"
+      - "2.26.0"
+      - "2.25.0"
+      - "2.24.1"
+      - "2.24.0"
+      - "2.23.0"
  - version: 0.14.0
    compatible:
+      - "2.26.1"
+      - "2.26.0"
+      - "2.25.0"
+      - "2.24.1"
      - "2.24.0"
      - "2.23.0"
      - "2.22.0"
--- a/website/generate-version-compatibility-overview.sh
+++ b/website/generate-version-compatibility-overview.sh
@@ -10,15 +10,21 @@ source "${HOME}/.sdkman/bin/sdkman-init.sh"

 set -e -u -o pipefail

+# Currently all released Error Prone Support versions are compatible with Java
+# 17.
+java_version=17.0.10-tem
+(set +u && echo n | sdk install java "${java_version}")
+sdk use java "${java_version}"
+
 output_file="$(dirname "${0}")/_data/compatibility.yml"

-ep_versions=$(
+ep_versions="$(
  git ls-remote \
      --exit-code --refs --sort='-v:refname' \
      https://github.com/google/error-prone.git \
      'v*.*' \
    | grep -oP '(?<=/v)[^/]+$'
-)
+)"

 work_dir="$(mktemp -d)"
 trap 'rm -rf -- "${work_dir=}"' INT TERM HUP EXIT
@@ -39,26 +45,43 @@ for eps_version in ${eps_versions}; do
  (set +u && echo n | sdk install maven "${mvn_version}")
  sdk use maven "${mvn_version}"

+  # Collect the list of checks supported by this version of Error Prone
+  # Support.
+  # XXX: Conditionally omit the `MethodReferenceUsage` exclusion once that
+  # check is production-ready.
+  mvn clean compile -Dverification.skip -DskipTests
+  checks="$(
+    find \
+       -path "*/META-INF/services/com.google.errorprone.bugpatterns.BugChecker" \
+       -not -path "*/error-prone-experimental/*" \
+       -not -path "*/error-prone-guidelines/*" \
+       -print0 \
+      | xargs -0 grep -hoP '[^.]+$' \
+      | grep -v '^MethodReferenceUsage$' \
+      | paste -s -d ',' -
+    )"
+
  # Remove any Error Prone flags used by this build that may not be compatible
  # with the targeted version of Error Prone. Removal of these build flags does
  # not influence the compatibility assessment.
  sed -i -r 's,-XepAllSuggestionsAsWarnings|-Xep:\w+:\w+,,g' pom.xml

  # Using each Error Prone release, attempt to build and test the source, while
-  # also applying the Maven Central-hosted Refaster rules. This determines
-  # source and behavioral (in)compatibility with Error Prone APIs, while also
-  # assessing whether the Refaster rules are deserialization-compatible.
+  # also applying the Maven Central-hosted Error Prone Support-defined checks
+  # and Refaster rules. This determines source and behavioral (in)compatibility
+  # with Error Prone APIs, while also assessing whether the Refaster rules are
+  # deserialization-compatible.
  for ep_version in ${ep_versions}; do
    echo "Testing Error Prone Support ${eps_version} with Error Prone ${ep_version}..."
    mvn clean test \
        -Perror-prone \
-        -Derror-prone.patch-checks=Refaster \
+        -Derror-prone.patch-checks="${checks}" \
        -Ppatch \
        -Pself-check \
        -Dverification.skip \
        -Dversion.error-prone-orig="${ep_version}" \
      && echo "SUCCESS: { \"eps_version\": \"${eps_version}\", \"ep_version\": \"${ep_version}\" }" || true
-    # Undo any changes applied by Refaster.
+    # Undo any changes applied by the checks.
    git checkout -- '*.java'
  done
 done | tee "${build_log}"
--- a/workshop/README.md
+++ b/workshop/README.md
@@ -0,0 +1,66 @@
+# Error Prone Workshop
+
+Download the slides [here][eps-workshop-codelabjug].
+
+## Initial setup of the workshop
+
+1. Start by cloning this repository locally from GitHub.
+2. Checkout the `workshop` branch.
+3. Make sure to run `mvn clean install` in the root of this repository.
+4. Open your code editor and familiarize yourself with the project structure.
+
+In IntelliJ IDEA (or your preferred editor), try to run the
+`WorkshopRefasterRulesTest` test. You might see the following error:
+
+```
+java: exporting a package from system module jdk.compiler is not allowed with --release
+```
+
+If this happens, go to _Settings -> Build, Execution, Deployment -> Compiler ->
+Java Compiler_ and deselect the option _Use '--release' option for
+cross-compilation (Java 9 and later)_.
+
+Now the project is ready for the workshop.
+
+## Part 1: Writing Refaster rules
+
+During this part of the workshop we will implement multiple Refaster rules.
+
+Go to the `workshop` module and open the
+`tech.picnic.errorprone.workshop.refasterrules` package. There you can find one
+example and 5 different exercises to do. Make sure to check out the
+`WorkshopRefasterRulesTest.java` class where you can enable tests. Per
+assignment there is a test in this class that one can enable (by dropping the
+`@Disabled` annotation) to validate your changes. The goal is to implement or
+improve the Refaster rules such that the enabled tests pass.
+
+Tips:
+
+* Go through the exercises in the proposed order.
+* The `XXX:` comments explains what needs to happen.
+* See the test cases for each Refaster rule by looking for the name of the
+  Refaster rule prefixed with `test`. For example, the
+  `WorkshopAssignment0Rules.java` rule collection has a Refaster rule named
+  `ExampleStringIsEmpty`. In the `WorkshopAssignment0RulesTestInput.java` and
+  `WorkshopAssignment0RulesTestOutput.java` files there is a
+  `testExampleStringIsEmpty` method that shows the input and output to test the
+  Refaster rule.
+
+## Part 2: Writing Error Prone checks
+
+During this part of the workshop we will implement parts of multiple Error
+Prone `BugChecker`s. Each of these classes contain `XXX` comments explaining
+what needs to be implemented. However, before diving in, make sure to first
+navigate to a check's associated test class to drop the class-level `@Disabled`
+annotation. Upon initial execution the tests will fail; the goal is to get then
+to pass.
+
+Some utility classes that you can use:
+
+* `com.google.errorprone.util.ASTHelpers`: contains many common operations on
+  the Abstract Syntax Tree.
+* `com.google.errorprone.fixes.SuggestedFixes`: contains helper methods for
+  creating `Fix`es.
+
+[eps-github]: https://github.com/PicnicSupermarket/error-prone-support
+[eps-workshop-codelabjug]: https://drive.google.com/file/d/1Q9HD5rKrcFszonOGqPqa2p7vyvV30brg/view
--- a/workshop/pom.xml
+++ b/workshop/pom.xml
@@ -0,0 +1,150 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>tech.picnic.error-prone-support</groupId>
+        <artifactId>error-prone-support</artifactId>
+        <version>0.16.2-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>workshop</artifactId>
+
+    <name>Picnic :: Error Prone Support :: Workshop</name>
+    <description>Project for the Error Prone Workshop.</description>
+    <url>https://error-prone.picnic.tech</url>
+
+    <dependencies>
+        <dependency>
+            <groupId>${groupId.error-prone}</groupId>
+            <artifactId>error_prone_annotation</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>${groupId.error-prone}</groupId>
+            <artifactId>error_prone_annotations</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>${groupId.error-prone}</groupId>
+            <artifactId>error_prone_check_api</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>${groupId.error-prone}</groupId>
+            <artifactId>error_prone_core</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>${groupId.error-prone}</groupId>
+            <artifactId>error_prone_test_helpers</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>error-prone-utils</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>refaster-compiler</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>refaster-support</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>refaster-test-support</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.auto.service</groupId>
+            <artifactId>auto-service-annotations</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.aspectj</groupId>
+            <artifactId>aspectjweaver</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-params</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.openrewrite</groupId>
+            <artifactId>rewrite-core</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.openrewrite</groupId>
+            <artifactId>rewrite-java</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.openrewrite</groupId>
+            <artifactId>rewrite-java-11</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.openrewrite</groupId>
+            <artifactId>rewrite-templating</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-context</artifactId>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-compiler-plugin</artifactId>
+                    <configuration>
+                        <annotationProcessorPaths combine.children="append">
+                            <path>
+                                <groupId>${project.groupId}</groupId>
+                                <artifactId>refaster-compiler</artifactId>
+                                <version>${project.version}</version>
+                            </path>
+                            <path>
+                                <groupId>${project.groupId}</groupId>
+                                <artifactId>refaster-support</artifactId>
+                                <version>${project.version}</version>
+                            </path>
+                        </annotationProcessorPaths>
+                        <compilerArgs combine.children="append">
+                            <arg>-Xplugin:RefasterRuleCompiler</arg>
+                        </compilerArgs>
+                    </configuration>
+                </plugin>
+            </plugins>
+        </pluginManagement>
+    </build>
+</project>
--- a/workshop/src/main/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment0DeleteEmptyMethod.java
+++ b/workshop/src/main/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment0DeleteEmptyMethod.java
@@ -0,0 +1,33 @@
+package tech.picnic.errorprone.workshop.bugpatterns;
+
+import static com.google.errorprone.BugPattern.SeverityLevel.WARNING;
+import static com.google.errorprone.BugPattern.StandardTags.SIMPLIFICATION;
+
+import com.google.auto.service.AutoService;
+import com.google.errorprone.BugPattern;
+import com.google.errorprone.VisitorState;
+import com.google.errorprone.bugpatterns.BugChecker;
+import com.google.errorprone.bugpatterns.BugChecker.MethodTreeMatcher;
+import com.google.errorprone.matchers.Description;
+import com.sun.source.tree.MethodTree;
+
+/** A {@link BugChecker} that flags empty methods that seemingly can simply be deleted. */
+@AutoService(BugChecker.class)
+@BugPattern(
+    summary = "Empty method can likely be deleted",
+    severity = WARNING,
+    tags = SIMPLIFICATION)
+public final class Assignment0DeleteEmptyMethod extends BugChecker implements MethodTreeMatcher {
+  private static final long serialVersionUID = 1L;
+
+  /** Instantiates a new {@link Assignment0DeleteEmptyMethod} instance. */
+  public Assignment0DeleteEmptyMethod() {}
+
+  @Override
+  public Description matchMethod(MethodTree tree, VisitorState state) {
+    // XXX: Part 1: Ensure that we only delete methods that contain no statements.
+    // XXX: Part 2: Don't delete methods that are annotated with `@Override`.
+
+    return Description.NO_MATCH;
+  }
+}
--- a/workshop/src/main/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment1AssertJIsNullMethod.java
+++ b/workshop/src/main/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment1AssertJIsNullMethod.java
@@ -0,0 +1,61 @@
+package tech.picnic.errorprone.workshop.bugpatterns;
+
+import static com.google.errorprone.BugPattern.SeverityLevel.SUGGESTION;
+import static com.google.errorprone.BugPattern.StandardTags.SIMPLIFICATION;
+import static com.google.errorprone.matchers.Matchers.allOf;
+import static com.google.errorprone.matchers.Matchers.argument;
+import static com.google.errorprone.matchers.Matchers.argumentCount;
+import static com.google.errorprone.matchers.Matchers.instanceMethod;
+import static com.google.errorprone.matchers.Matchers.nullLiteral;
+
+import com.google.errorprone.BugPattern;
+import com.google.errorprone.VisitorState;
+import com.google.errorprone.bugpatterns.BugChecker;
+import com.google.errorprone.bugpatterns.BugChecker.MethodInvocationTreeMatcher;
+import com.google.errorprone.fixes.SuggestedFix;
+import com.google.errorprone.matchers.Description;
+import com.google.errorprone.matchers.Matcher;
+import com.sun.source.tree.MethodInvocationTree;
+
+/**
+ * A {@link BugChecker} that flags AssertJ {@code isEqualTo(null)} checks for simplification.
+ *
+ * <p>This bug checker cannot be replaced with a simple Refaster rule, as the Refaster approach
+ * would require that all overloads of {@link org.assertj.core.api.Assert#isEqualTo(Object)} (such
+ * as {@link org.assertj.core.api.AbstractStringAssert#isEqualTo(String)}) are explicitly
+ * enumerated. This bug checker generically matches all such current and future overloads.
+ */
+@BugPattern(
+    summary = "Prefer `.isNull()` over `.isEqualTo(null)`",
+    severity = SUGGESTION,
+    tags = SIMPLIFICATION)
+public final class Assignment1AssertJIsNullMethod extends BugChecker
+    implements MethodInvocationTreeMatcher {
+  private static final long serialVersionUID = 1L;
+  private static final Matcher<MethodInvocationTree> ASSERT_IS_EQUAL_TO_NULL =
+      allOf(
+          instanceMethod().onDescendantOf("org.assertj.core.api.Assert").named("isEqualTo"),
+          argumentCount(1),
+          argument(0, nullLiteral()));
+
+  /** Instantiates a new {@link Assignment1AssertJIsNullMethod} instance. */
+  public Assignment1AssertJIsNullMethod() {}
+
+  @Override
+  public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
+    // This statement filters out `MethodInvocation`s that are *not* `assertThat().isEqualTo(null)`
+    // statements.
+    if (!ASSERT_IS_EQUAL_TO_NULL.matches(tree, state)) {
+      return Description.NO_MATCH;
+    }
+
+    SuggestedFix.Builder fix = SuggestedFix.builder();
+
+    // XXX: Using `fix.merge(<some code>);` make sure we rename the method invocation to `isNull`.
+    // See the `SuggestedFixes` class ;).
+
+    tree.getArguments().forEach(arg -> fix.merge(SuggestedFix.delete(arg)));
+
+    return describeMatch(tree, fix.build());
+  }
+}
--- a/workshop/src/main/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment2DropMockitoEq.java
+++ b/workshop/src/main/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment2DropMockitoEq.java
@@ -0,0 +1,56 @@
+package tech.picnic.errorprone.workshop.bugpatterns;
+
+import static com.google.errorprone.BugPattern.SeverityLevel.SUGGESTION;
+import static com.google.errorprone.BugPattern.StandardTags.SIMPLIFICATION;
+import static com.google.errorprone.matchers.Matchers.staticMethod;
+
+import com.google.common.collect.Iterables;
+import com.google.errorprone.BugPattern;
+import com.google.errorprone.VisitorState;
+import com.google.errorprone.bugpatterns.BugChecker;
+import com.google.errorprone.bugpatterns.BugChecker.MethodInvocationTreeMatcher;
+import com.google.errorprone.fixes.SuggestedFix;
+import com.google.errorprone.matchers.Description;
+import com.google.errorprone.matchers.Matcher;
+import com.sun.source.tree.ExpressionTree;
+import com.sun.source.tree.MethodInvocationTree;
+import tech.picnic.errorprone.utils.SourceCode;
+
+/**
+ * A {@link BugChecker} that flags method invocations for which all arguments are wrapped using
+ * {@link org.mockito.Mockito#eq}; this is redundant.
+ */
+@BugPattern(
+    summary = "Don't unnecessarily use Mockito's `eq(...)`",
+    severity = SUGGESTION,
+    tags = SIMPLIFICATION)
+public final class Assignment2DropMockitoEq extends BugChecker
+    implements MethodInvocationTreeMatcher {
+  private static final long serialVersionUID = 1L;
+  private static final Matcher<ExpressionTree> MOCKITO_EQ_METHOD =
+      staticMethod().onClass("org.mockito.ArgumentMatchers").named("eq");
+
+  /** Instantiates a new {@link Assignment2DropMockitoEq} instance. */
+  public Assignment2DropMockitoEq() {}
+
+  @Override
+  public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
+    // XXX: Make sure to return `Description.NO_MATCH` if the `tree` doesn't have arguments, or if
+    // the `isEqInvocation` method below returns `false` for at least one of the arguments.
+
+    SuggestedFix.Builder suggestedFix = SuggestedFix.builder();
+    for (ExpressionTree arg : tree.getArguments()) {
+      suggestedFix.replace(
+          arg,
+          SourceCode.treeToString(
+              Iterables.getOnlyElement(((MethodInvocationTree) arg).getArguments()), state));
+    }
+
+    return describeMatch(tree, suggestedFix.build());
+  }
+
+  @SuppressWarnings("UnusedMethod" /* Recommended to use when implementing this assignment. */)
+  private static boolean isEqInvocation(ExpressionTree tree, VisitorState state) {
+    return tree instanceof MethodInvocationTree && MOCKITO_EQ_METHOD.matches(tree, state);
+  }
+}
--- a/workshop/src/main/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment3DropAutowiredConstructorAnnotation.java
+++ b/workshop/src/main/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment3DropAutowiredConstructorAnnotation.java
@@ -0,0 +1,54 @@
+package tech.picnic.errorprone.workshop.bugpatterns;
+
+import static com.google.errorprone.BugPattern.SeverityLevel.SUGGESTION;
+import static com.google.errorprone.BugPattern.StandardTags.SIMPLIFICATION;
+import static com.google.errorprone.matchers.ChildMultiMatcher.MatchType.AT_LEAST_ONE;
+import static com.google.errorprone.matchers.Matchers.annotations;
+import static com.google.errorprone.matchers.Matchers.isType;
+
+import com.google.common.collect.Iterables;
+import com.google.errorprone.BugPattern;
+import com.google.errorprone.VisitorState;
+import com.google.errorprone.bugpatterns.BugChecker;
+import com.google.errorprone.bugpatterns.BugChecker.ClassTreeMatcher;
+import com.google.errorprone.matchers.Description;
+import com.google.errorprone.matchers.MultiMatcher;
+import com.google.errorprone.matchers.MultiMatcher.MultiMatchResult;
+import com.sun.source.tree.AnnotationTree;
+import com.sun.source.tree.ClassTree;
+import com.sun.source.tree.MethodTree;
+import com.sun.source.tree.Tree;
+import java.util.ArrayList;
+import java.util.List;
+import tech.picnic.errorprone.utils.SourceCode;
+
+/** A {@link BugChecker} that flags redundant {@code @Autowired} constructor annotations. */
+@BugPattern(
+    summary = "Omit `@Autowired` on a class' sole constructor, as it is redundant",
+    severity = SUGGESTION,
+    tags = SIMPLIFICATION)
+public final class Assignment3DropAutowiredConstructorAnnotation extends BugChecker
+    implements ClassTreeMatcher {
+  private static final long serialVersionUID = 1L;
+  private static final MultiMatcher<Tree, AnnotationTree> AUTOWIRED_ANNOTATION =
+      annotations(AT_LEAST_ONE, isType("org.springframework.beans.factory.annotation.Autowired"));
+
+  /** Instantiates a new {@link Assignment3DropAutowiredConstructorAnnotation} instance. */
+  public Assignment3DropAutowiredConstructorAnnotation() {}
+
+  @Override
+  public Description matchClass(ClassTree tree, VisitorState state) {
+    // XXX: Using the `ASTHelpers#getConstructors` method, return `Description.NO_MATCH` if we do
+    // not have exactly 1 constructor (start by dropping `new ArrayList<>()` on the next line).
+    List<MethodTree> constructors = new ArrayList<>();
+
+    MultiMatchResult<AnnotationTree> hasAutowiredAnnotation =
+        AUTOWIRED_ANNOTATION.multiMatchResult(Iterables.getOnlyElement(constructors), state);
+    if (!hasAutowiredAnnotation.matches()) {
+      return Description.NO_MATCH;
+    }
+
+    AnnotationTree annotation = hasAutowiredAnnotation.onlyMatchingNode();
+    return describeMatch(annotation, SourceCode.deleteWithTrailingWhitespace(annotation, state));
+  }
+}
--- a/workshop/src/main/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment4JUnitTestMethodDeclaration.java
+++ b/workshop/src/main/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment4JUnitTestMethodDeclaration.java
@@ -0,0 +1,61 @@
+package tech.picnic.errorprone.workshop.bugpatterns;
+
+import static com.google.errorprone.BugPattern.SeverityLevel.WARNING;
+import static com.google.errorprone.BugPattern.StandardTags.SIMPLIFICATION;
+import static com.google.errorprone.matchers.ChildMultiMatcher.MatchType.AT_LEAST_ONE;
+import static com.google.errorprone.matchers.Matchers.annotations;
+import static com.google.errorprone.matchers.Matchers.anyOf;
+import static com.google.errorprone.matchers.Matchers.isType;
+
+import com.google.auto.service.AutoService;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Sets;
+import com.google.errorprone.BugPattern;
+import com.google.errorprone.VisitorState;
+import com.google.errorprone.bugpatterns.BugChecker;
+import com.google.errorprone.bugpatterns.BugChecker.MethodTreeMatcher;
+import com.google.errorprone.fixes.SuggestedFix;
+import com.google.errorprone.matchers.Description;
+import com.google.errorprone.matchers.MultiMatcher;
+import com.sun.source.tree.AnnotationTree;
+import com.sun.source.tree.MethodTree;
+import javax.lang.model.element.Modifier;
+
+/** A {@link BugChecker} that flags non-canonical JUnit method declarations. */
+@AutoService(BugChecker.class)
+@BugPattern(
+    summary = "JUnit method declaration can likely be improved",
+    severity = WARNING,
+    tags = SIMPLIFICATION)
+@SuppressWarnings({
+  "UnusedMethod",
+  "UnusedVariable"
+} /* This check is yet to be implemented as part of the demo. */)
+public final class Assignment4JUnitTestMethodDeclaration extends BugChecker
+    implements MethodTreeMatcher {
+  private static final long serialVersionUID = 1L;
+  private static final ImmutableSet<Modifier> ILLEGAL_MODIFIERS =
+      Sets.immutableEnumSet(Modifier.PRIVATE, Modifier.PROTECTED, Modifier.PUBLIC);
+  private static final MultiMatcher<MethodTree, AnnotationTree> TEST_METHOD =
+      annotations(AT_LEAST_ONE, anyOf(isType("org.junit.jupiter.api.Test")));
+
+  /** Instantiates a new {@link Assignment4JUnitTestMethodDeclaration} instance. */
+  public Assignment4JUnitTestMethodDeclaration() {}
+
+  @Override
+  public Description matchMethod(MethodTree tree, VisitorState state) {
+    // XXX: Part 1: Return `Description.NO_MATCH` if the method is not a `TEST_METHOD`.
+
+    SuggestedFix.Builder fixBuilder = SuggestedFix.builder();
+
+    // XXX: Part 2: Make sure that JUnit test methods don't use any of the modifiers from the
+    // `ILLEGAL_MODIFIERS` field, by using `SuggestedFixes#removeModifiers` and
+    // `SuggestedFix.Builder#merge`.
+
+    if (fixBuilder.isEmpty()) {
+      return Description.NO_MATCH;
+    }
+
+    return describeMatch(tree, fixBuilder.build());
+  }
+}
--- a/workshop/src/main/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment5DeleteIdentityConversion.java
+++ b/workshop/src/main/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment5DeleteIdentityConversion.java
@@ -0,0 +1,108 @@
+package tech.picnic.errorprone.workshop.bugpatterns;
+
+import static com.google.common.collect.ImmutableSet.toImmutableSet;
+import static com.google.errorprone.BugPattern.SeverityLevel.WARNING;
+import static com.google.errorprone.BugPattern.StandardTags.SIMPLIFICATION;
+import static com.google.errorprone.matchers.Matchers.anyOf;
+import static com.google.errorprone.matchers.Matchers.staticMethod;
+import static com.google.errorprone.suppliers.Suppliers.OBJECT_TYPE;
+
+import com.google.common.primitives.Primitives;
+import com.google.errorprone.BugPattern;
+import com.google.errorprone.VisitorState;
+import com.google.errorprone.bugpatterns.BugChecker;
+import com.google.errorprone.bugpatterns.BugChecker.MethodInvocationTreeMatcher;
+import com.google.errorprone.bugpatterns.TypesWithUndefinedEquality;
+import com.google.errorprone.matchers.Description;
+import com.google.errorprone.matchers.Matcher;
+import com.google.errorprone.util.ASTHelpers;
+import com.google.errorprone.util.ASTHelpers.TargetType;
+import com.sun.source.tree.ExpressionTree;
+import com.sun.source.tree.MemberSelectTree;
+import com.sun.source.tree.MethodInvocationTree;
+import com.sun.tools.javac.code.Type;
+import com.sun.tools.javac.code.Types;
+import java.util.Arrays;
+import java.util.List;
+
+/** A {@link BugChecker} that flags redundant identity conversions. */
+@BugPattern(
+    summary = "Avoid or clarify identity conversions",
+    severity = WARNING,
+    tags = SIMPLIFICATION)
+public final class Assignment5DeleteIdentityConversion extends BugChecker
+    implements MethodInvocationTreeMatcher {
+  private static final long serialVersionUID = 1L;
+  private static final Matcher<ExpressionTree> IS_CONVERSION_METHOD =
+      anyOf(
+          staticMethod()
+              .onClassAny(
+                  Primitives.allWrapperTypes().stream()
+                      .map(Class::getName)
+                      .collect(toImmutableSet()))
+              .named("valueOf"),
+          staticMethod().onClass(String.class.getName()).named("valueOf"),
+          staticMethod()
+              .onClassAny(
+                  "com.google.common.collect.ImmutableBiMap",
+                  "com.google.common.collect.ImmutableList",
+                  "com.google.common.collect.ImmutableListMultimap",
+                  "com.google.common.collect.ImmutableMap",
+                  "com.google.common.collect.ImmutableMultimap",
+                  "com.google.common.collect.ImmutableMultiset",
+                  "com.google.common.collect.ImmutableRangeMap",
+                  "com.google.common.collect.ImmutableRangeSet",
+                  "com.google.common.collect.ImmutableSet",
+                  "com.google.common.collect.ImmutableSetMultimap",
+                  "com.google.common.collect.ImmutableTable")
+              .named("copyOf"),
+          staticMethod()
+              .onClass("com.google.errorprone.matchers.Matchers")
+              .namedAnyOf("allOf", "anyOf"));
+
+  /** Instantiates a new {@link Assignment5DeleteIdentityConversion} instance. */
+  public Assignment5DeleteIdentityConversion() {}
+
+  @Override
+  public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
+    List<? extends ExpressionTree> arguments = tree.getArguments();
+    // XXX: Make sure we skip invocations that do not pass exactly one argument, by using the
+    // `tree`.
+    if (!IS_CONVERSION_METHOD.matches(tree, state)) {
+      return Description.NO_MATCH;
+    }
+
+    ExpressionTree sourceTree = arguments.get(0);
+    Type sourceType = ASTHelpers.getType(sourceTree);
+    Type resultType = ASTHelpers.getType(tree);
+    TargetType targetType = ASTHelpers.targetType(state);
+    if (sourceType == null || resultType == null || targetType == null) {
+      return Description.NO_MATCH;
+    }
+
+    if (!state.getTypes().isSameType(sourceType, resultType)
+        && !isConvertibleWithWellDefinedEquality(sourceType, targetType.type(), state)) {
+      return Description.NO_MATCH;
+    }
+
+    if (sourceType.isPrimitive()
+        && state.getPath().getParentPath().getLeaf() instanceof MemberSelectTree) {
+      return Description.NO_MATCH;
+    }
+
+    return buildDescription(tree)
+        // XXX: Use the `.addFix()` to suggest replacing the original `tree` with the `sourceTree`.
+        // Tip: You can get the actual String representation of a Tree by using the
+        // `SourceCode#treeToString`.
+        .build();
+  }
+
+  private static boolean isConvertibleWithWellDefinedEquality(
+      Type sourceType, Type targetType, VisitorState state) {
+    Types types = state.getTypes();
+    return !types.isSameType(targetType, OBJECT_TYPE.get(state))
+        && types.isConvertible(sourceType, targetType)
+        && Arrays.stream(TypesWithUndefinedEquality.values())
+            .noneMatch(b -> b.matchesType(sourceType, state) || b.matchesType(targetType, state));
+  }
+}
--- a/workshop/src/main/java/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment0Rules.java
+++ b/workshop/src/main/java/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment0Rules.java
@@ -0,0 +1,9 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+/** Refaster rule used as example for the assignments of the workshop. */
+final class WorkshopAssignment0Rules {
+  private WorkshopAssignment0Rules() {}
+
+  /** Prefer {@link String#isEmpty()} over alternatives that consult the string's length. */
+  static final class ExampleStringIsEmpty {}
+}
--- a/workshop/src/main/java/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment1Rules.java
+++ b/workshop/src/main/java/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment1Rules.java
@@ -0,0 +1,11 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+/** Refaster rules for the first assignment of the workshop. */
+final class WorkshopAssignment1Rules {
+  private WorkshopAssignment1Rules() {}
+
+  /** Prefer {@link String#String(char[])} over {@link String#copyValueOf(char[])}. */
+  static final class NewStringCharArray {
+    // XXX: Implement this Refaster rule.
+  }
+}
--- a/workshop/src/main/java/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment2Rules.java
+++ b/workshop/src/main/java/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment2Rules.java
@@ -0,0 +1,17 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+import com.google.common.collect.ImmutableList;
+
+/** Refaster rules for the second assignment of the workshop. */
+@SuppressWarnings("UnusedTypeParameter" /* Ignore this for demo purposes. */)
+final class WorkshopAssignment2Rules {
+  private WorkshopAssignment2Rules() {}
+
+  /**
+   * Prefer {@link ImmutableList#of(Object)} over alternatives that don't communicate the
+   * immutability of the resulting list at the type level.
+   */
+  static final class ImmutableListOfOne<T> {
+    // XXX: Implement this Refaster rule.
+  }
+}
--- a/workshop/src/main/java/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment3Rules.java
+++ b/workshop/src/main/java/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment3Rules.java
@@ -0,0 +1,21 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+import com.google.common.base.Preconditions;
+
+/** Refaster rules for the third assignment of the workshop. */
+@SuppressWarnings("UnusedTypeParameter" /* Ignore this for demo purposes. */)
+final class WorkshopAssignment3Rules {
+  private WorkshopAssignment3Rules() {}
+
+  // XXX: Tip: check the input and output files to see the *expected* refactoring.
+
+  /** Prefer {@link Preconditions#checkArgument(boolean)} over if statements. */
+  static final class CheckArgumentWithoutMessage {
+    // XXX: Implement the Refaster rule to get the test green.
+  }
+
+  /** Prefer {@link Preconditions#checkArgument(boolean, Object)} over if statements. */
+  static final class CheckArgumentWithMessage {
+    // XXX: Implement the Refaster rule to get the test green.
+  }
+}
--- a/workshop/src/main/java/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment4Rules.java
+++ b/workshop/src/main/java/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment4Rules.java
@@ -0,0 +1,25 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+/** Refaster rules for the fourth assignment of the workshop. */
+@SuppressWarnings("java:S1698" /* Reference comparison is valid for enums. */)
+final class WorkshopAssignment4Rules {
+  private WorkshopAssignment4Rules() {}
+
+  // The test fails because non Enum comparisons are also rewritten.
+  // Fix the test by tweaking the type parameters.
+
+  // XXX: Get the test to pass by improving the Refaster rule (uncommented it first).
+
+  //  static final class PrimitiveOrReferenceEqualityEnum<T> {
+  //    @BeforeTemplate
+  //    boolean before(T a, T b) {
+  //      return Refaster.anyOf(a.equals(b), Objects.equals(a, b));
+  //    }
+  //
+  //    @AfterTemplate
+  //    @AlsoNegation
+  //    boolean after(T a, T b) {
+  //      return a == b;
+  //    }
+  //  }
+}
--- a/workshop/src/main/java/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment5Rules.java
+++ b/workshop/src/main/java/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment5Rules.java
@@ -0,0 +1,12 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+/** Refaster rules for the fifth assignment of the workshop. */
+@SuppressWarnings("UnusedTypeParameter" /* Ignore this for demo purposes. */)
+final class WorkshopAssignment5Rules {
+  private WorkshopAssignment5Rules() {}
+
+  abstract static class StreamDoAllMatch<T> {
+    // XXX: Implement the Refaster rule to get the test green.
+    // Tip: use the `@Placeholder` annotation.
+  }
+}
--- a/workshop/src/test/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment0DeleteEmptyMethodTest.java
+++ b/workshop/src/test/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment0DeleteEmptyMethodTest.java
@@ -0,0 +1,70 @@
+package tech.picnic.errorprone.workshop.bugpatterns;
+
+import com.google.errorprone.BugCheckerRefactoringTestHelper;
+import com.google.errorprone.BugCheckerRefactoringTestHelper.TestMode;
+import com.google.errorprone.CompilationTestHelper;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+@Disabled("Enable this when implementing the BugChecker.")
+final class Assignment0DeleteEmptyMethodTest {
+  @Test
+  void identification() {
+    CompilationTestHelper.newInstance(Assignment0DeleteEmptyMethod.class, getClass())
+        .addSourceLines(
+            "A.java",
+            "class A {",
+            "  Object m1() {",
+            "    return null;",
+            "  }",
+            "",
+            "  void m2() {",
+            "    System.out.println(42);",
+            "  }",
+            "",
+            "  // BUG: Diagnostic contains:",
+            "  static void m3() {}",
+            "",
+            "  interface F {",
+            "    void fun();",
+            "  }",
+            "}")
+        .addSourceLines(
+            "B.java",
+            "final class B implements A.F {",
+            "  @Override",
+            "  public void fun() {}",
+            "",
+            "  /** Javadoc. */",
+            "  // BUG: Diagnostic contains:",
+            "  void m4() {}",
+            "}")
+        .doTest();
+  }
+
+  @Test
+  void replacement() {
+    BugCheckerRefactoringTestHelper.newInstance(Assignment0DeleteEmptyMethod.class, getClass())
+        .addInputLines(
+            "A.java",
+            "final class A {",
+            "",
+            "  void instanceMethod() {}",
+            "",
+            "  static void staticMethod() {}",
+            "",
+            "  static void staticMethodWithComment() {",
+            "    System.out.println(42);",
+            "  }",
+            "}")
+        .addOutputLines(
+            "A.java",
+            "final class A {",
+            "",
+            "  static void staticMethodWithComment() {",
+            "    System.out.println(42);",
+            "  }",
+            "}")
+        .doTest(TestMode.TEXT_MATCH);
+  }
+}
--- a/workshop/src/test/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment1AssertJIsNullMethodTest.java
+++ b/workshop/src/test/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment1AssertJIsNullMethodTest.java
@@ -0,0 +1,60 @@
+package tech.picnic.errorprone.workshop.bugpatterns;
+
+import com.google.errorprone.BugCheckerRefactoringTestHelper;
+import com.google.errorprone.BugCheckerRefactoringTestHelper.TestMode;
+import com.google.errorprone.CompilationTestHelper;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+@Disabled("Enable this when implementing the BugChecker.")
+final class Assignment1AssertJIsNullMethodTest {
+  @Test
+  void identification() {
+    CompilationTestHelper.newInstance(Assignment1AssertJIsNullMethod.class, getClass())
+        .addSourceLines(
+            "A.java",
+            "import static org.assertj.core.api.Assertions.assertThat;",
+            "",
+            "class A {",
+            "  void m() {",
+            "    assertThat(1).isEqualTo(1);",
+            "    // BUG: Diagnostic contains:",
+            "    assertThat(1).isEqualTo(null);",
+            "    // BUG: Diagnostic contains:",
+            "    assertThat(\"foo\").isEqualTo(null);",
+            "    isEqualTo(null);",
+            "  }",
+            "",
+            "  private boolean isEqualTo(Object value) {",
+            "    return value.equals(\"bar\");",
+            "  }",
+            "}")
+        .doTest();
+  }
+
+  @Test
+  void replacement() {
+    BugCheckerRefactoringTestHelper.newInstance(Assignment1AssertJIsNullMethod.class, getClass())
+        .addInputLines(
+            "A.java",
+            "import static org.assertj.core.api.Assertions.assertThat;",
+            "",
+            "class A {",
+            "  void m() {",
+            "    assertThat(1).isEqualTo(null);",
+            "    assertThat(\"foo\").isEqualTo(null);",
+            "  }",
+            "}")
+        .addOutputLines(
+            "A.java",
+            "import static org.assertj.core.api.Assertions.assertThat;",
+            "",
+            "class A {",
+            "  void m() {",
+            "    assertThat(1).isNull();",
+            "    assertThat(\"foo\").isNull();",
+            "  }",
+            "}")
+        .doTest(TestMode.TEXT_MATCH);
+  }
+}
--- a/workshop/src/test/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment2DropMockitoEqTest.java
+++ b/workshop/src/test/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment2DropMockitoEqTest.java
@@ -0,0 +1,102 @@
+package tech.picnic.errorprone.workshop.bugpatterns;
+
+import com.google.errorprone.BugCheckerRefactoringTestHelper;
+import com.google.errorprone.BugCheckerRefactoringTestHelper.TestMode;
+import com.google.errorprone.CompilationTestHelper;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+@Disabled("Enable this when implementing the BugChecker.")
+final class Assignment2DropMockitoEqTest {
+  @Test
+  void identification() {
+    CompilationTestHelper.newInstance(Assignment2DropMockitoEq.class, getClass())
+        .addSourceLines(
+            "A.java",
+            "import static org.mockito.ArgumentMatchers.eq;",
+            "import static org.mockito.ArgumentMatchers.notNull;",
+            "import static org.mockito.Mockito.doAnswer;",
+            "import static org.mockito.Mockito.mock;",
+            "",
+            "import java.util.function.BiConsumer;",
+            "import java.util.function.Consumer;",
+            "import org.mockito.ArgumentMatchers;",
+            "",
+            "class A {",
+            "  void m() {",
+            "    Runnable runnable = mock(Runnable.class);",
+            "    doAnswer(inv -> null).when(runnable).run();",
+            "",
+            "    Consumer<String> consumer = mock(Consumer.class);",
+            "    doAnswer(inv -> null).when(consumer).accept(\"foo\");",
+            "    doAnswer(inv -> null).when(consumer).accept(notNull());",
+            "    // BUG: Diagnostic contains:",
+            "    doAnswer(inv -> null).when(consumer).accept(ArgumentMatchers.eq(\"foo\"));",
+            "    // BUG: Diagnostic contains:",
+            "    doAnswer(inv -> null).when(consumer).accept(eq(toString()));",
+            "",
+            "    BiConsumer<Integer, String> biConsumer = mock(BiConsumer.class);",
+            "    doAnswer(inv -> null).when(biConsumer).accept(0, \"foo\");",
+            "    doAnswer(inv -> null).when(biConsumer).accept(eq(0), notNull());",
+            "    doAnswer(inv -> null).when(biConsumer).accept(notNull(), eq(\"foo\"));",
+            "    doAnswer(inv -> null)",
+            "        .when(biConsumer)",
+            "        // BUG: Diagnostic contains:",
+            "        .accept(ArgumentMatchers.eq(0), ArgumentMatchers.eq(\"foo\"));",
+            "    // BUG: Diagnostic contains:",
+            "    doAnswer(inv -> null).when(biConsumer).accept(eq(hashCode()), eq(toString()));",
+            "  }",
+            "}")
+        .doTest();
+  }
+
+  @Test
+  void replacement() {
+    BugCheckerRefactoringTestHelper.newInstance(Assignment2DropMockitoEq.class, getClass())
+        .addInputLines(
+            "A.java",
+            "import static org.mockito.ArgumentMatchers.eq;",
+            "import static org.mockito.Mockito.doAnswer;",
+            "import static org.mockito.Mockito.mock;",
+            "",
+            "import java.util.function.BiConsumer;",
+            "import java.util.function.Consumer;",
+            "import org.mockito.ArgumentMatchers;",
+            "",
+            "class A {",
+            "  void m() {",
+            "    Consumer<String> consumer = mock(Consumer.class);",
+            "    doAnswer(inv -> null).when(consumer).accept(ArgumentMatchers.eq(\"foo\"));",
+            "    doAnswer(inv -> null).when(consumer).accept(eq(toString()));",
+            "",
+            "    BiConsumer<Integer, String> biConsumer = mock(BiConsumer.class);",
+            "    doAnswer(inv -> null)",
+            "        .when(biConsumer)",
+            "        .accept(ArgumentMatchers.eq(0), ArgumentMatchers.eq(\"foo\"));",
+            "    doAnswer(inv -> null).when(biConsumer).accept(eq(hashCode()), eq(toString()));",
+            "  }",
+            "}")
+        .addOutputLines(
+            "A.java",
+            "import static org.mockito.ArgumentMatchers.eq;",
+            "import static org.mockito.Mockito.doAnswer;",
+            "import static org.mockito.Mockito.mock;",
+            "",
+            "import java.util.function.BiConsumer;",
+            "import java.util.function.Consumer;",
+            "import org.mockito.ArgumentMatchers;",
+            "",
+            "class A {",
+            "  void m() {",
+            "    Consumer<String> consumer = mock(Consumer.class);",
+            "    doAnswer(inv -> null).when(consumer).accept(\"foo\");",
+            "    doAnswer(inv -> null).when(consumer).accept(toString());",
+            "",
+            "    BiConsumer<Integer, String> biConsumer = mock(BiConsumer.class);",
+            "    doAnswer(inv -> null).when(biConsumer).accept(0, \"foo\");",
+            "    doAnswer(inv -> null).when(biConsumer).accept(hashCode(), toString());",
+            "  }",
+            "}")
+        .doTest(TestMode.TEXT_MATCH);
+  }
+}
--- a/workshop/src/test/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment3DropAutowiredConstructorAnnotationTest.java
+++ b/workshop/src/test/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment3DropAutowiredConstructorAnnotationTest.java
@@ -0,0 +1,106 @@
+package tech.picnic.errorprone.workshop.bugpatterns;
+
+import com.google.errorprone.BugCheckerRefactoringTestHelper;
+import com.google.errorprone.BugCheckerRefactoringTestHelper.TestMode;
+import com.google.errorprone.CompilationTestHelper;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+@Disabled("Enable this when implementing the BugChecker.")
+final class Assignment3DropAutowiredConstructorAnnotationTest {
+  @Test
+  void identification() {
+    CompilationTestHelper.newInstance(
+            Assignment3DropAutowiredConstructorAnnotation.class, getClass())
+        .addSourceLines(
+            "Container.java",
+            "import com.google.errorprone.annotations.Immutable;",
+            "import java.util.List;",
+            "import org.springframework.beans.factory.annotation.Autowired;",
+            "",
+            "interface Container {",
+            "  @Immutable",
+            "  class A {",
+            "    A() {}",
+            "  }",
+            "",
+            "  class B {",
+            "    @Autowired",
+            "    void setProperty(Object o) {}",
+            "  }",
+            "",
+            "  class C {",
+            "    // BUG: Diagnostic contains:",
+            "    @Autowired",
+            "    C() {}",
+            "  }",
+            "",
+            "  class D {",
+            "    // BUG: Diagnostic contains:",
+            "    @Autowired",
+            "    D(String x) {}",
+            "  }",
+            "",
+            "  class E {",
+            "    @Autowired",
+            "    E() {}",
+            "",
+            "    E(String x) {}",
+            "  }",
+            "",
+            "  class F {",
+            "    F() {}",
+            "",
+            "    @Autowired",
+            "    F(String x) {}",
+            "  }",
+            "",
+            "  class G {",
+            "    @Autowired private Object o;",
+            "  }",
+            "",
+            "  class H {",
+            "    @SafeVarargs",
+            "    H(List<String>... lists) {}",
+            "  }",
+            "}")
+        .doTest();
+  }
+
+  @Test
+  void replacement() {
+    BugCheckerRefactoringTestHelper.newInstance(
+            Assignment3DropAutowiredConstructorAnnotation.class, getClass())
+        .addInputLines(
+            "Container.java",
+            "import org.springframework.beans.factory.annotation.Autowired;",
+            "",
+            "interface Container {",
+            "  class A {",
+            "    @Autowired",
+            "    @Deprecated",
+            "    A() {}",
+            "  }",
+            "",
+            "  class B {",
+            "    @Autowired",
+            "    B(String x) {}",
+            "  }",
+            "}")
+        .addOutputLines(
+            "Container.java",
+            "import org.springframework.beans.factory.annotation.Autowired;",
+            "",
+            "interface Container {",
+            "  class A {",
+            "    @Deprecated",
+            "    A() {}",
+            "  }",
+            "",
+            "  class B {",
+            "    B(String x) {}",
+            "  }",
+            "}")
+        .doTest(TestMode.TEXT_MATCH);
+  }
+}
--- a/workshop/src/test/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment4JUnitTestMethodDeclarationTest.java
+++ b/workshop/src/test/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment4JUnitTestMethodDeclarationTest.java
@@ -0,0 +1,91 @@
+package tech.picnic.errorprone.workshop.bugpatterns;
+
+import com.google.errorprone.BugCheckerRefactoringTestHelper;
+import com.google.errorprone.BugCheckerRefactoringTestHelper.TestMode;
+import com.google.errorprone.CompilationTestHelper;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+@Disabled("Enable this to validate part 1.")
+final class Assignment4JUnitTestMethodDeclarationTest {
+  @Test
+  void identificationIllegalModifiers() {
+    CompilationTestHelper.newInstance(Assignment4JUnitTestMethodDeclaration.class, getClass())
+        .addSourceLines(
+            "A.java",
+            "import org.junit.jupiter.api.Test;",
+            "",
+            "class A {",
+            "  @Test",
+            "  void method1() {}",
+            "",
+            "  @Test",
+            "  // BUG: Diagnostic contains:",
+            "  public void method2() {}",
+            "",
+            "  @Test",
+            "  // BUG: Diagnostic contains:",
+            "  protected void method3() {}",
+            "",
+            "  @Test",
+            "  // BUG: Diagnostic contains:",
+            "  private void method4() {}",
+            "",
+            "  public void method5() {}",
+            "",
+            "  protected void method6() {}",
+            "",
+            "  private void method7() {}",
+            "}")
+        .doTest();
+  }
+
+  @Test
+  void replacementIllegalModifiers() {
+    BugCheckerRefactoringTestHelper.newInstance(
+            Assignment4JUnitTestMethodDeclaration.class, getClass())
+        .addInputLines(
+            "A.java",
+            "import org.junit.jupiter.api.Test;",
+            "",
+            "class A {",
+            "  @Test",
+            "  void foo() {}",
+            "",
+            "  @Test",
+            "  public void bar() {}",
+            "",
+            "  @Test",
+            "  protected void baz() {}",
+            "",
+            "  @Test",
+            "  private void qux() {}",
+            "",
+            "  public void quux() {}",
+            "",
+            "  private void quuz() {}",
+            "}")
+        .addOutputLines(
+            "A.java",
+            "import org.junit.jupiter.api.Test;",
+            "",
+            "class A {",
+            "  @Test",
+            "  void foo() {}",
+            "",
+            "  @Test",
+            "  void bar() {}",
+            "",
+            "  @Test",
+            "  void baz() {}",
+            "",
+            "  @Test",
+            "  void qux() {}",
+            "",
+            "  public void quux() {}",
+            "",
+            "  private void quuz() {}",
+            "}")
+        .doTest(TestMode.TEXT_MATCH);
+  }
+}
--- a/workshop/src/test/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment5DeleteIdentityConversionTest.java
+++ b/workshop/src/test/java/tech/picnic/errorprone/workshop/bugpatterns/Assignment5DeleteIdentityConversionTest.java
@@ -0,0 +1,223 @@
+package tech.picnic.errorprone.workshop.bugpatterns;
+
+import com.google.errorprone.BugCheckerRefactoringTestHelper;
+import com.google.errorprone.BugCheckerRefactoringTestHelper.TestMode;
+import com.google.errorprone.CompilationTestHelper;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+@Disabled("Enable this when implementing the BugChecker.")
+final class Assignment5DeleteIdentityConversionTest {
+  @Test
+  void identification() {
+    CompilationTestHelper.newInstance(Assignment5DeleteIdentityConversion.class, getClass())
+        .addSourceLines(
+            "A.java",
+            "import static com.google.errorprone.matchers.Matchers.instanceMethod;",
+            "import static com.google.errorprone.matchers.Matchers.staticMethod;",
+            "",
+            "import com.google.common.collect.ImmutableBiMap;",
+            "import com.google.common.collect.ImmutableList;",
+            "import com.google.common.collect.ImmutableListMultimap;",
+            "import com.google.common.collect.ImmutableMap;",
+            "import com.google.common.collect.ImmutableMultimap;",
+            "import com.google.common.collect.ImmutableMultiset;",
+            "import com.google.common.collect.ImmutableRangeMap;",
+            "import com.google.common.collect.ImmutableRangeSet;",
+            "import com.google.common.collect.ImmutableSet;",
+            "import com.google.common.collect.ImmutableSetMultimap;",
+            "import com.google.common.collect.ImmutableTable;",
+            "import com.google.errorprone.matchers.Matcher;",
+            "import com.google.errorprone.matchers.Matchers;",
+            "",
+            "public final class A {",
+            "  public void m() {",
+            "    // BUG: Diagnostic contains:",
+            "    Matcher allOf1 = Matchers.allOf(instanceMethod());",
+            "    Matcher allOf2 = Matchers.allOf(instanceMethod(), staticMethod());",
+            "    // BUG: Diagnostic contains:",
+            "    Matcher anyOf1 = Matchers.anyOf(staticMethod());",
+            "    Matcher anyOf2 = Matchers.anyOf(instanceMethod(), staticMethod());",
+            "",
+            "    // BUG: Diagnostic contains:",
+            "    Boolean b1 = Boolean.valueOf(Boolean.FALSE);",
+            "    // BUG: Diagnostic contains:",
+            "    Boolean b2 = Boolean.valueOf(false);",
+            "    // BUG: Diagnostic contains:",
+            "    boolean b3 = Boolean.valueOf(Boolean.FALSE);",
+            "    // BUG: Diagnostic contains:",
+            "    boolean b4 = Boolean.valueOf(false);",
+            "",
+            "    // BUG: Diagnostic contains:",
+            "    Byte byte1 = Byte.valueOf((Byte) Byte.MIN_VALUE);",
+            "    // BUG: Diagnostic contains:",
+            "    Byte byte2 = Byte.valueOf(Byte.MIN_VALUE);",
+            "    // BUG: Diagnostic contains:",
+            "    byte byte3 = Byte.valueOf((Byte) Byte.MIN_VALUE);",
+            "    // BUG: Diagnostic contains:",
+            "    byte byte4 = Byte.valueOf(Byte.MIN_VALUE);",
+            "",
+            "    // BUG: Diagnostic contains:",
+            "    Character c1 = Character.valueOf((Character) 'a');",
+            "    // BUG: Diagnostic contains:",
+            "    Character c2 = Character.valueOf('a');",
+            "    // BUG: Diagnostic contains:",
+            "    char c3 = Character.valueOf((Character) 'a');",
+            "    // BUG: Diagnostic contains:",
+            "    char c4 = Character.valueOf('a');",
+            "",
+            "    // BUG: Diagnostic contains:",
+            "    Double d1 = Double.valueOf((Double) 0.0);",
+            "    // BUG: Diagnostic contains:",
+            "    Double d2 = Double.valueOf(0.0);",
+            "    // BUG: Diagnostic contains:",
+            "    double d3 = Double.valueOf((Double) 0.0);",
+            "    // BUG: Diagnostic contains:",
+            "    double d4 = Double.valueOf(0.0);",
+            "",
+            "    // BUG: Diagnostic contains:",
+            "    Float f1 = Float.valueOf((Float) 0.0F);",
+            "    // BUG: Diagnostic contains:",
+            "    Float f2 = Float.valueOf(0.0F);",
+            "    // BUG: Diagnostic contains:",
+            "    float f3 = Float.valueOf((Float) 0.0F);",
+            "    // BUG: Diagnostic contains:",
+            "    float f4 = Float.valueOf(0.0F);",
+            "",
+            "    // BUG: Diagnostic contains:",
+            "    Integer i1 = Integer.valueOf((Integer) 1);",
+            "    // BUG: Diagnostic contains:",
+            "    Integer i2 = Integer.valueOf(1);",
+            "    // BUG: Diagnostic contains:",
+            "    int i3 = Integer.valueOf((Integer) 1);",
+            "    // BUG: Diagnostic contains:",
+            "    int i4 = Integer.valueOf(1);",
+            "",
+            "    // BUG: Diagnostic contains:",
+            "    Long l1 = Long.valueOf((Long) 1L);",
+            "    // BUG: Diagnostic contains:",
+            "    Long l2 = Long.valueOf(1L);",
+            "    // BUG: Diagnostic contains:",
+            "    long l3 = Long.valueOf((Long) 1L);",
+            "    // BUG: Diagnostic contains:",
+            "    long l4 = Long.valueOf(1L);",
+            "",
+            "    Long l5 = Long.valueOf((Integer) 1);",
+            "    Long l6 = Long.valueOf(1);",
+            "    // BUG: Diagnostic contains:",
+            "    long l7 = Long.valueOf((Integer) 1);",
+            "    // BUG: Diagnostic contains:",
+            "    long l8 = Long.valueOf(1);",
+            "",
+            "    // BUG: Diagnostic contains:",
+            "    Short s1 = Short.valueOf((Short) Short.MIN_VALUE);",
+            "    // BUG: Diagnostic contains:",
+            "    Short s2 = Short.valueOf(Short.MIN_VALUE);",
+            "    // BUG: Diagnostic contains:",
+            "    short s3 = Short.valueOf((Short) Short.MIN_VALUE);",
+            "    // BUG: Diagnostic contains:",
+            "    short s4 = Short.valueOf(Short.MIN_VALUE);",
+            "",
+            "    // BUG: Diagnostic contains:",
+            "    String boolStr = Boolean.valueOf(Boolean.FALSE).toString();",
+            "    int boolHash = Boolean.valueOf(false).hashCode();",
+            "    // BUG: Diagnostic contains:",
+            "    int byteHash = Byte.valueOf((Byte) Byte.MIN_VALUE).hashCode();",
+            "    String byteStr = Byte.valueOf(Byte.MIN_VALUE).toString();",
+            "",
+            "    String str1 = String.valueOf(0);",
+            "    // BUG: Diagnostic contains:",
+            "    String str2 = String.valueOf(\"1\");",
+            "",
+            "    // BUG: Diagnostic contains:",
+            "    ImmutableBiMap<Object, Object> o1 = ImmutableBiMap.copyOf(ImmutableBiMap.of());",
+            "    // BUG: Diagnostic contains:",
+            "    ImmutableList<Object> o2 = ImmutableList.copyOf(ImmutableList.of());",
+            "    ImmutableListMultimap<Object, Object> o3 =",
+            "        // BUG: Diagnostic contains:",
+            "        ImmutableListMultimap.copyOf(ImmutableListMultimap.of());",
+            "    // BUG: Diagnostic contains:",
+            "    ImmutableMap<Object, Object> o4 = ImmutableMap.copyOf(ImmutableMap.of());",
+            "    // BUG: Diagnostic contains:",
+            "    ImmutableMultimap<Object, Object> o5 = ImmutableMultimap.copyOf(ImmutableMultimap.of());",
+            "    // BUG: Diagnostic contains:",
+            "    ImmutableMultiset<Object> o6 = ImmutableMultiset.copyOf(ImmutableMultiset.of());",
+            "    // BUG: Diagnostic contains:",
+            "    ImmutableRangeMap<String, Object> o7 = ImmutableRangeMap.copyOf(ImmutableRangeMap.of());",
+            "    // BUG: Diagnostic contains:",
+            "    ImmutableRangeSet<String> o8 = ImmutableRangeSet.copyOf(ImmutableRangeSet.of());",
+            "    // BUG: Diagnostic contains:",
+            "    ImmutableSet<Object> o9 = ImmutableSet.copyOf(ImmutableSet.of());",
+            "    ImmutableSetMultimap<Object, Object> o10 =",
+            "        // BUG: Diagnostic contains:",
+            "        ImmutableSetMultimap.copyOf(ImmutableSetMultimap.of());",
+            "    // BUG: Diagnostic contains:",
+            "    ImmutableTable<Object, Object, Object> o11 = ImmutableTable.copyOf(ImmutableTable.of());",
+            "  }",
+            "}")
+        .doTest();
+  }
+
+  @Test
+  void replacement() {
+    BugCheckerRefactoringTestHelper.newInstance(
+            Assignment5DeleteIdentityConversion.class, getClass())
+        .addInputLines(
+            "A.java",
+            "import static com.google.errorprone.matchers.Matchers.staticMethod;",
+            "import static org.mockito.Mockito.when;",
+            "",
+            "import com.google.common.collect.ImmutableCollection;",
+            "import com.google.common.collect.ImmutableList;",
+            "import com.google.common.collect.ImmutableSet;",
+            "import java.util.ArrayList;",
+            "import java.util.Collection;",
+            "",
+            "public final class A {",
+            "  public void m() {",
+            "    ImmutableSet<Object> set1 = ImmutableSet.copyOf(ImmutableSet.of());",
+            "    ImmutableSet<Object> set2 = ImmutableSet.copyOf(ImmutableList.of());",
+            "",
+            "    ImmutableCollection<Integer> list1 = ImmutableList.copyOf(ImmutableList.of(1));",
+            "    ImmutableCollection<Integer> list2 = ImmutableList.copyOf(new ArrayList<>(ImmutableList.of(1)));",
+            "",
+            "    Collection<Integer> c1 = ImmutableSet.copyOf(ImmutableSet.of(1));",
+            "    Collection<Integer> c2 = ImmutableList.copyOf(new ArrayList<>(ImmutableList.of(1)));",
+            "",
+            "    Object o1 = ImmutableSet.copyOf(ImmutableList.of());",
+            "    Object o2 = ImmutableSet.copyOf(ImmutableSet.of());",
+            "",
+            "    when(\"foo\".contains(\"f\")).thenAnswer(inv -> ImmutableSet.copyOf(ImmutableList.of(1)));",
+            "  }",
+            "}")
+        .addOutputLines(
+            "A.java",
+            "import static com.google.errorprone.matchers.Matchers.staticMethod;",
+            "import static org.mockito.Mockito.when;",
+            "",
+            "import com.google.common.collect.ImmutableCollection;",
+            "import com.google.common.collect.ImmutableList;",
+            "import com.google.common.collect.ImmutableSet;",
+            "import java.util.ArrayList;",
+            "import java.util.Collection;",
+            "",
+            "public final class A {",
+            "  public void m() {",
+            "    ImmutableSet<Object> set1 = ImmutableSet.of();",
+            "    ImmutableSet<Object> set2 = ImmutableSet.copyOf(ImmutableList.of());",
+            "",
+            "    ImmutableCollection<Integer> list1 = ImmutableList.of(1);",
+            "    ImmutableCollection<Integer> list2 = ImmutableList.copyOf(new ArrayList<>(ImmutableList.of(1)));",
+            "",
+            "    Collection<Integer> c1 = ImmutableSet.of(1);",
+            "    Collection<Integer> c2 = ImmutableList.copyOf(new ArrayList<>(ImmutableList.of(1)));",
+            "",
+            "    Object o1 = ImmutableSet.copyOf(ImmutableList.of());",
+            "    Object o2 = ImmutableSet.of();",
+            "",
+            "    when(\"foo\".contains(\"f\")).thenAnswer(inv -> ImmutableSet.copyOf(ImmutableList.of(1)));",
+            "  }",
+            "}")
+        .doTest(TestMode.TEXT_MATCH);
+  }
+}
--- a/workshop/src/test/java/tech/picnic/errorprone/workshop/refasterrules/WorkshopRefasterRulesTest.java
+++ b/workshop/src/test/java/tech/picnic/errorprone/workshop/refasterrules/WorkshopRefasterRulesTest.java
@@ -0,0 +1,43 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollection;
+
+final class WorkshopRefasterRulesTest {
+  @Disabled("Needs to be implemented in `WorkshopAssignment0Rules.java`.")
+  @Test
+  void validateExampleRuleCollection() {
+    RefasterRuleCollection.validate(WorkshopAssignment0Rules.class);
+  }
+
+  @Disabled("Needs to be implemented in `WorkshopAssignment1Rules.java`.")
+  @Test
+  void validateFirstWorkshopAssignment() {
+    RefasterRuleCollection.validate(WorkshopAssignment1Rules.class);
+  }
+
+  @Disabled("Needs to be implemented in `WorkshopAssignment2Rules.java`.")
+  @Test
+  void validateSecondWorkshopAssignment() {
+    RefasterRuleCollection.validate(WorkshopAssignment2Rules.class);
+  }
+
+  @Disabled("Needs to be implemented in `WorkshopAssignment3Rules.java`.")
+  @Test
+  void validateThirdWorkshopAssignment() {
+    RefasterRuleCollection.validate(WorkshopAssignment3Rules.class);
+  }
+
+  @Disabled("Needs to be implemented in `WorkshopAssignment4Rules.java`.")
+  @Test
+  void validateFourthWorkshopAssignment() {
+    RefasterRuleCollection.validate(WorkshopAssignment4Rules.class);
+  }
+
+  @Disabled("Needs to be implemented in `WorkshopAssignment5Rules.java`.")
+  @Test
+  void validateFifthWorkshopAssignment() {
+    RefasterRuleCollection.validate(WorkshopAssignment5Rules.class);
+  }
+}
--- a/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment0RulesTestInput.java
+++ b/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment0RulesTestInput.java
@@ -0,0 +1,10 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
+
+final class WorkshopAssignment0RulesTest implements RefasterRuleCollectionTestCase {
+  boolean testExampleStringIsEmpty() {
+    boolean b = "foo".length() == 0;
+    return "bar".length() == 0;
+  }
+}
--- a/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment0RulesTestOutput.java
+++ b/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment0RulesTestOutput.java
@@ -0,0 +1,10 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
+
+final class WorkshopAssignment0RulesTest implements RefasterRuleCollectionTestCase {
+  boolean testExampleStringIsEmpty() {
+    boolean b = "foo".isEmpty();
+    return "bar".isEmpty();
+  }
+}
--- a/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment1RulesTestInput.java
+++ b/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment1RulesTestInput.java
@@ -0,0 +1,11 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
+
+final class WorkshopAssignment1RulesTest implements RefasterRuleCollectionTestCase {
+  String testNewStringCharArray() {
+    String.copyValueOf(new char[] {});
+    String.copyValueOf(new char[] {'f', 'o', 'o'});
+    return String.copyValueOf(new char[] {'b', 'a', 'r'});
+  }
+}
--- a/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment1RulesTestOutput.java
+++ b/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment1RulesTestOutput.java
@@ -0,0 +1,11 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
+
+final class WorkshopAssignment1RulesTest implements RefasterRuleCollectionTestCase {
+  String testNewStringCharArray() {
+    new String(new char[] {});
+    new String(new char[] {'f', 'o', 'o'});
+    return new String(new char[] {'b', 'a', 'r'});
+  }
+}
--- a/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment2RulesTestInput.java
+++ b/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment2RulesTestInput.java
@@ -0,0 +1,20 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+import com.google.common.collect.ImmutableSet;
+import java.util.Collections;
+import java.util.List;
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
+
+final class WorkshopAssignment2RulesTest implements RefasterRuleCollectionTestCase {
+  @Override
+  public ImmutableSet<Object> elidedTypesAndStaticImports() {
+    return ImmutableSet.of(Collections.class);
+  }
+
+  List<Object> testImmutableListOfOne() {
+    Collections.singletonList(1);
+    Collections.singletonList("foo");
+    List.of(1);
+    return List.of("bar");
+  }
+}
--- a/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment2RulesTestOutput.java
+++ b/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment2RulesTestOutput.java
@@ -0,0 +1,21 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableSet;
+import java.util.Collections;
+import java.util.List;
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
+
+final class WorkshopAssignment2RulesTest implements RefasterRuleCollectionTestCase {
+  @Override
+  public ImmutableSet<Object> elidedTypesAndStaticImports() {
+    return ImmutableSet.of(Collections.class);
+  }
+
+  List<Object> testImmutableListOfOne() {
+    ImmutableList.of(1);
+    ImmutableList.of("foo");
+    ImmutableList.of(1);
+    return ImmutableList.of("bar");
+  }
+}
--- a/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment3RulesTestInput.java
+++ b/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment3RulesTestInput.java
@@ -0,0 +1,24 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
+
+final class WorkshopAssignment3RulesTest implements RefasterRuleCollectionTestCase {
+  void testCheckArgumentWithoutMessage() {
+    if (!"foo".isEmpty()) {
+      throw new IllegalArgumentException();
+    }
+    if (!"bar".isEmpty()) {
+      throw new IllegalArgumentException();
+    }
+  }
+
+  void testCheckArgumentWithMessage() {
+    if (!"foo".isEmpty()) {
+      throw new IllegalArgumentException("The string is not empty");
+    }
+    if (!"bar".isEmpty()) {
+      throw new IllegalArgumentException(
+          "The rule should be able rewrite all kinds of messages ;).");
+    }
+  }
+}
--- a/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment3RulesTestOutput.java
+++ b/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment3RulesTestOutput.java
@@ -0,0 +1,17 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
+
+final class WorkshopAssignment3RulesTest implements RefasterRuleCollectionTestCase {
+  void testCheckArgumentWithoutMessage() {
+    checkArgument("foo".isEmpty());
+    checkArgument("bar".isEmpty());
+  }
+
+  void testCheckArgumentWithMessage() {
+    checkArgument("foo".isEmpty(), "The string is not empty");
+    checkArgument("bar".isEmpty(), "The rule should be able rewrite all kinds of messages ;).");
+  }
+}
--- a/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment4RulesTestInput.java
+++ b/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment4RulesTestInput.java
@@ -0,0 +1,25 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+import com.google.common.collect.ImmutableSet;
+import java.math.RoundingMode;
+import java.util.Objects;
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
+
+final class WorkshopAssignment4RulesTest implements RefasterRuleCollectionTestCase {
+  @Override
+  public ImmutableSet<Object> elidedTypesAndStaticImports() {
+    return ImmutableSet.of(Objects.class);
+  }
+
+  ImmutableSet<Boolean> testPrimitiveOrReferenceEqualityEnum() {
+    // Don't pay attention to the `ImmutableSet#of` here, it's just syntactical sugar for the
+    // testing framework.
+    return ImmutableSet.of(
+        "foo".equals("bar"),
+        Integer.valueOf(1).equals(2),
+        RoundingMode.UP.equals(RoundingMode.DOWN),
+        Objects.equals(RoundingMode.UP, RoundingMode.DOWN),
+        !RoundingMode.UP.equals(RoundingMode.DOWN),
+        !Objects.equals(RoundingMode.UP, RoundingMode.DOWN));
+  }
+}
--- a/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment4RulesTestOutput.java
+++ b/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment4RulesTestOutput.java
@@ -0,0 +1,25 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+import com.google.common.collect.ImmutableSet;
+import java.math.RoundingMode;
+import java.util.Objects;
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
+
+final class WorkshopAssignment4RulesTest implements RefasterRuleCollectionTestCase {
+  @Override
+  public ImmutableSet<Object> elidedTypesAndStaticImports() {
+    return ImmutableSet.of(Objects.class);
+  }
+
+  ImmutableSet<Boolean> testPrimitiveOrReferenceEqualityEnum() {
+    // Don't pay attention to the `ImmutableSet#of` here, it's just syntactical sugar for the
+    // testing framework.
+    return ImmutableSet.of(
+        "foo".equals("bar"),
+        Integer.valueOf(1).equals(2),
+        RoundingMode.UP == RoundingMode.DOWN,
+        RoundingMode.UP == RoundingMode.DOWN,
+        RoundingMode.UP != RoundingMode.DOWN,
+        RoundingMode.UP != RoundingMode.DOWN);
+  }
+}
--- a/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment5RulesTestInput.java
+++ b/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment5RulesTestInput.java
@@ -0,0 +1,11 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
+
+final class WorkshopAssignment5RulesTest implements RefasterRuleCollectionTestCase {
+  boolean testStreamDoAllMatch() {
+    boolean example = Stream.of("foo").noneMatch(s -> !s.isBlank());
+    return Stream.of("bar").noneMatch(b -> !b.startsWith("b"));
+  }
+}
--- a/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment5RulesTestOutput.java
+++ b/workshop/src/test/resources/tech/picnic/errorprone/workshop/refasterrules/WorkshopAssignment5RulesTestOutput.java
@@ -0,0 +1,11 @@
+package tech.picnic.errorprone.workshop.refasterrules;
+
+import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
+
+final class WorkshopAssignment5RulesTest implements RefasterRuleCollectionTestCase {
+  boolean testStreamDoAllMatch() {
+    boolean example = Stream.of("foo").allMatch(s -> s.isBlank());
+    return Stream.of("bar").allMatch(b -> b.startsWith("b"));
+  }
+}
Author	SHA1	Message	Date
Rick Ossendrijver	6319e8a2c1	Disable integration test	2024-04-09 17:04:19 +02:00
Rick Ossendrijver	852c013263	Sync integration tests	2024-04-09 15:57:44 +02:00
Rick Ossendrijver	8bf111d2f0	Introduce `workshop` module and configure integration-test	2024-04-09 14:56:37 +02:00
Picnic-Bot	bc67883579	Upgrade TestNG 7.9.0 -> 7.10.0 (#1126 ) See: - https://github.com/testng-team/testng/releases/tag/7.10.0 - https://github.com/testng-team/testng/compare/7.9.0...7.10.0	2024-04-08 07:18:40 +02:00
Picnic-Bot	069d6ff2f4	Upgrade maven-source-plugin 3.3.0 -> 3.3.1 (#1125 ) See: - https://issues.apache.org/jira/issues/?jql=project%20%3D%20MSOURCES%20AND%20fixVersion%20%3E%203.3.0%20AND%20fixVersion%20%3C%3D%203.3.1 - https://github.com/apache/maven-source-plugin/compare/maven-source-plugin-3.3.0...maven-source-plugin-3.3.1	2024-04-06 14:52:39 +02:00
Picnic-Bot	6fbf4d81f0	Upgrade OpenRewrite 2.8.1 -> 2.9.0 (#1123 ) See: - https://github.com/openrewrite/rewrite-recipe-bom/releases/tag/v2.9.0 - https://github.com/openrewrite/rewrite-recipe-bom/compare/v2.8.1...v2.9.0	2024-04-06 13:04:51 +02:00
Picnic-Bot	3d51acd613	Upgrade MongoDB driver 5.0.0 -> 5.0.1 (#1121 ) See: - https://jira.mongodb.org/issues/?jql=project%20%3D%20JAVA%20AND%20fixVersion%20%3E%205.0.0%20AND%20fixVersion%20%3C%3D%205.0.1 - https://github.com/mongodb/mongo-java-driver/releases/tag/r5.0.1 - https://github.com/mongodb/mongo-java-driver/compare/r5.0.0...r5.0.1	2024-04-04 14:48:14 +02:00
Picnic-Bot	d2fb576ecc	Upgrade jacoco-maven-plugin 0.8.11 -> 0.8.12 (#1122 ) See: - https://github.com/jacoco/jacoco/releases/tag/v0.8.12 - https://github.com/jacoco/jacoco/compare/v0.8.11...v0.8.12	2024-04-04 14:31:03 +02:00
Stephan Schroevers	d658901231	Upgrade Error Prone fork v2.26.1-picnic-1 -> v2.26.1-picnic-2 (#1119 ) See: - https://github.com/PicnicSupermarket/error-prone/releases/tag/v2.26.1-picnic-2 - https://github.com/PicnicSupermarket/error-prone/compare/v2.26.1-picnic-1...v2.26.1-picnic-2	2024-04-03 16:46:24 +02:00
Picnic-Bot	76d1ca7bdf	Upgrade Checkstyle 10.14.2 -> 10.15.0 (#1118 ) See: - https://checkstyle.sourceforge.io/releasenotes.html - https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-10.15.0 - https://github.com/checkstyle/checkstyle/compare/checkstyle-10.14.2...checkstyle-10.15.0	2024-04-03 11:22:32 +02:00
Picnic-Bot	341977b227	Upgrade Google Java Format 1.21.0 -> 1.22.0 (#1120 ) See: - https://github.com/google/google-java-format/releases/tag/v1.22.0 - https://github.com/google/google-java-format/compare/v1.21.0...v1.22.0	2024-04-03 08:27:53 +02:00
Rick Ossendrijver	75872dc2f5	Introduce Cody as IntelliJ icon (#1075 )	2024-03-30 19:18:42 +01:00
Picnic-Bot	b609537a52	Upgrade pomchecker-maven-plugin 1.10.0 -> 1.11.0 (#1112 ) See: - https://github.com/kordamp/pomchecker/releases/tag/v1.11.0 - https://github.com/kordamp/pomchecker/compare/v1.10.0...v1.11.0	2024-03-30 15:09:54 +01:00
Picnic-Bot	1469d1e157	Upgrade maven-gpg-plugin 3.2.1 -> 3.2.2 (#1113 ) See: - https://github.com/apache/maven-gpg-plugin/releases/tag/maven-gpg-plugin-3.2.2 - https://github.com/apache/maven-gpg-plugin/compare/maven-gpg-plugin-3.2.1...maven-gpg-plugin-3.2.2	2024-03-30 14:02:27 +01:00
Picnic-Bot	111b7d04f2	Upgrade actions/configure-pages v4.0.0 -> v5.0.0 (#1117 ) See: - https://github.com/actions/configure-pages/releases/tag/v5.0.0	2024-03-30 13:53:38 +01:00
Picnic-Bot	9e297df1c7	Upgrade errorprone-slf4j 0.1.22 -> 0.1.23 (#1111 ) See: - https://github.com/KengoTODA/errorprone-slf4j/releases/tag/v0.1.23 - https://github.com/KengoTODA/errorprone-slf4j/compare/v0.1.22...v0.1.23	2024-03-30 13:27:28 +01:00
Picnic-Bot	7babb48751	Upgrade NullAway 0.10.24 -> 0.10.25 (#1116 ) See: - https://github.com/uber/NullAway/blob/master/CHANGELOG.md - https://github.com/uber/NullAway/releases/tag/v0.10.25 - https://github.com/uber/NullAway/compare/v0.10.24...v0.10.25	2024-03-30 12:46:03 +01:00
Picnic-Bot	dfaffacbb5	Upgrade Byte Buddy 1.14.12 -> 1.14.13 (#1115 ) See: - https://github.com/raphw/byte-buddy/releases/tag/byte-buddy-1.14.13 - https://github.com/raphw/byte-buddy/compare/byte-buddy-1.14.12...byte-buddy-1.14.13	2024-03-30 12:26:44 +01:00
Stephan Schroevers	769779cf21	Introduce Refaster rules that resolve `EnumOrdinal` violations (#1104 )	2024-03-27 15:44:19 +01:00
Rick Ossendrijver	9d8a5af44a	Start release notes with "Update considerations and deprecations" section (#1105 )	2024-03-25 14:19:31 +01:00
Picnic-Bot	8a84acca7b	Upgrade Forbidden APIs plugin 3.6 -> 3.7 (#1107 ) See: - https://github.com/policeman-tools/forbidden-apis/wiki/Changes - https://github.com/policeman-tools/forbidden-apis/compare/3.6...3.7	2024-03-25 10:41:39 +01:00
Picnic-Bot	b551f90d38	Upgrade dawidd6/action-download-artifact v3.1.2 -> v3.1.4 (#1109 ) See: - https://github.com/dawidd6/action-download-artifact/releases/tag/v3.1.4 - https://github.com/dawidd6/action-download-artifact/releases/tag/v3.1.3	2024-03-25 10:12:27 +01:00
Picnic-Bot	789a9cc0aa	Upgrade AspectJ 1.9.21.2 -> 1.9.22 (#1106 ) See: - https://github.com/eclipse-aspectj/aspectj/releases/tag/V1_9_22 - https://github.com/eclipse-aspectj/aspectj/compare/V1_9_21_2...V1_9_22	2024-03-25 09:53:18 +01:00
Picnic-Bot	13e35338af	Upgrade ruby/setup-ruby v1.172.0 -> v1.173.0 (#1110 ) See https://github.com/ruby/setup-ruby/releases/tag/v1.173.0	2024-03-25 09:43:35 +01:00
Stephan Schroevers	281a003dd7	Introduce `OptionalOrElse` check (#1024 ) While there, extend the `OptionalIdentity` Refaster rule to automatically resolve one class of `NestedOptionals` violations.	2024-03-25 09:29:17 +01:00
Picnic-Bot	e40df7e1b8	Upgrade CodeQL v3.24.5 -> v3.24.9 (#1108 ) See: - https://github.com/github/codeql-action/blob/main/CHANGELOG.md - https://github.com/github/codeql-action/compare/v3.24.8...v3.24.9 - https://github.com/github/codeql-action/compare/v3.24.7...v3.24.8 - https://github.com/github/codeql-action/compare/v3.24.6...v3.24.7 - https://github.com/github/codeql-action/compare/v3.24.5...v3.24.6	2024-03-25 08:42:59 +01:00
Picnic-Bot	bb2b1e6034	Upgrade Spring Boot 3.2.3 -> 3.2.4 (#1103 ) See: - https://github.com/spring-projects/spring-boot/releases/tag/v3.2.4 - https://github.com/spring-projects/spring-boot/compare/v3.2.3...v3.2.4	2024-03-23 12:49:26 +01:00
Stephan Schroevers	f8cac19330	Compact and replace `StreamIs{,Not}Empty` Refaster rules (#1028 ) The new `StreamFindAnyIs{Empty,Present}` rules are simpler thanks to the use of `@AlsoNegation`. In some cases an additional application of the `OptionalIsEmpty` rule will be required.	2024-03-22 08:23:18 +01:00
Picnic-Bot	52fe79c343	Upgrade Swagger 2.2.20 -> 2.2.21 (#1102 ) See: - https://github.com/swagger-api/swagger-core/releases/tag/v2.2.21 - https://github.com/swagger-api/swagger-core/compare/v2.2.20...v2.2.21	2024-03-22 08:11:48 +01:00
Picnic-Bot	0b696b95b6	Upgrade maven-compiler-plugin 3.12.1 -> 3.13.0 (#1101 ) See: - https://github.com/apache/maven-compiler-plugin/releases/tag/maven-compiler-plugin-3.13.0 - https://github.com/apache/maven-compiler-plugin/compare/maven-compiler-plugin-3.12.1...maven-compiler-plugin-3.13.0	2024-03-21 10:39:37 +01:00
Picnic-Bot	63bc903f83	Upgrade Spring Security 6.2.2 -> 6.2.3 (#1093 ) See: - https://github.com/spring-projects/spring-security/releases/tag/6.2.3 - https://github.com/spring-projects/spring-security/compare/6.2.2...6.2.3	2024-03-21 08:17:04 +01:00
Stephan Schroevers	b166d0daea	Update Error Prone compatibility matrix (#1092 ) While there, improve the generation script.	2024-03-21 07:31:07 +01:00
Picnic-Bot	6914dae822	Upgrade swagger-annotations 1.6.13 -> 1.6.14 (#1100 ) See: - https://github.com/swagger-api/swagger-core/releases/tag/v1.6.13 - https://github.com/swagger-api/swagger-core/compare/v1.6.12...v1.6.13	2024-03-20 17:46:13 +01:00
Picnic-Bot	c5fb53d725	Upgrade Guava 33.0.0-jre -> 33.1.0-jre (#1086 ) See: - https://guava.dev/releases/33.1.0-jre/api/diffs/ - https://github.com/google/guava/releases/tag/v33.1.0 - https://github.com/google/guava/compare/v33.0.0...v33.1.0	2024-03-20 10:59:23 +01:00
Picnic-Bot	d36d20da08	Upgrade OpenRewrite Templating 1.6.2 -> 1.6.3 (#1099 ) See: - https://github.com/openrewrite/rewrite-templating/releases/tag/v1.6.3 - https://github.com/openrewrite/rewrite-templating/compare/v1.6.2...v1.6.3	2024-03-20 08:35:53 +01:00
Picnic-Bot	502281f4d3	Upgrade maven-gpg-plugin 3.2.0 -> 3.2.1 (#1096 ) See: - https://github.com/apache/maven-gpg-plugin/releases/tag/maven-gpg-plugin-3.2.1 - https://github.com/apache/maven-gpg-plugin/compare/maven-gpg-plugin-3.2.0...maven-gpg-plugin-3.2.1	2024-03-20 08:06:38 +01:00
Picnic-Bot	daa4f19c57	Upgrade OpenRewrite 2.8.0 -> 2.8.1 (#1098 ) See: - https://github.com/openrewrite/rewrite-recipe-bom/releases/tag/v2.8.1 - https://github.com/openrewrite/rewrite-recipe-bom/compare/v2.8.0...v2.8.1	2024-03-20 07:42:57 +01:00
Picnic-Bot	02f726f43c	Upgrade git-commit-id-maven-plugin 8.0.1 -> 8.0.2 (#1095 ) See: - https://github.com/git-commit-id/git-commit-id-maven-plugin/releases/tag/v8.0.2 - https://github.com/git-commit-id/git-commit-id-maven-plugin/compare/v8.0.1...v8.0.2	2024-03-19 11:57:38 +01:00
Picnic-Bot	b9e8186159	Upgrade actions/deploy-pages v4.0.4 -> v4.0.5 (#1094 ) See: - https://github.com/actions/deploy-pages/releases/tag/v4.0.5	2024-03-19 10:55:56 +01:00
Picnic-Bot	85baadd5df	Upgrade Error Prone 2.25.0 -> 2.26.1 (#1078 ) See: - https://github.com/google/error-prone/releases/tag/v2.26.0 - https://github.com/google/error-prone/releases/tag/v2.26.1 - https://github.com/google/error-prone/compare/v2.25.0...v2.26.1 - https://github.com/PicnicSupermarket/error-prone/compare/v2.25.0-picnic-2...v2.26.1-picnic-1	2024-03-19 08:07:43 +01:00
Picnic-Bot	ab871ec9bb	Upgrade Checkstyle 10.14.0 -> 10.14.2 (#1079 ) See: - https://checkstyle.sourceforge.io/releasenotes.html - https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-10.14.1 - https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-10.14.2 - https://github.com/checkstyle/checkstyle/compare/checkstyle-10.14.0...checkstyle-10.14.2	2024-03-18 15:26:27 +01:00
Picnic-Bot	753928f4da	Upgrade Project Reactor 2023.0.3 -> 2023.0.4 (#1085 ) See: - https://github.com/reactor/reactor/releases/tag/2023.0.4 - https://github.com/reactor/reactor/compare/2023.0.3...2023.0.4	2024-03-18 14:29:36 +01:00
Picnic-Bot	fe84bada33	Upgrade AspectJ 1.9.21.1 -> 1.9.21.2 (#1089 ) See: - https://github.com/eclipse-aspectj/aspectj/releases/tag/V1_9_21_2 - https://github.com/eclipse/org.aspectj/compare/V1_9_21_1...V1_9_21_2	2024-03-18 12:54:41 +01:00
Picnic-Bot	5b8d6ed9c5	Upgrade Spring 6.1.4 -> 6.1.5 (#1091 ) See: - https://github.com/spring-projects/spring-framework/releases/tag/v6.1.5 - https://github.com/spring-projects/spring-framework/compare/v6.1.4...v6.1.5	2024-03-18 11:50:49 +01:00
Picnic-Bot	2ad2fdfb0f	Upgrade sortpom-maven-plugin 3.4.0 -> 3.4.1 (#1077 ) See: - https://github.com/Ekryd/sortpom/wiki/Versions - https://github.com/Ekryd/sortpom/releases/tag/sortpom-parent-3.4.1 - https://github.com/Ekryd/sortpom/compare/sortpom-parent-3.4.0...sortpom-parent-3.4.1	2024-03-18 11:01:03 +01:00
Picnic-Bot	a10558a044	Upgrade maven-gpg-plugin 3.1.0 -> 3.2.0 (#1082 ) See: - https://issues.apache.org/jira/issues/?jql=project%20%3D%20MGPG%20AND%20fixVersion%20%3E%203.1.0%20AND%20fixVersion%20%3C%3D%203.2.0 - https://github.com/apache/maven-gpg-plugin/compare/maven-gpg-plugin-3.1.0...maven-gpg-plugin-3.2.0	2024-03-18 10:00:55 +01:00
Picnic-Bot	7316d05c22	Upgrade sonar-maven-plugin 3.10.0.2594 -> 3.11.0.3922 (#1090 ) See: - https://github.com/SonarSource/sonar-scanner-maven/releases/tag/3.11.0.3922 - https://github.com/SonarSource/sonar-scanner-maven/compare/3.10.0.2594...3.11.0.3922	2024-03-18 09:43:40 +01:00
Picnic-Bot	3177db55b8	Upgrade OpenRewrite 2.7.1 -> 2.8.0 (#1081 ) See: - https://github.com/openrewrite/rewrite-recipe-bom/releases/tag/v2.8.0 - https://github.com/openrewrite/rewrite-recipe-bom/compare/v2.7.1...v2.8.0	2024-03-18 08:45:48 +01:00
Picnic-Bot	a6a63f9553	Upgrade Jackson 2.16.2 -> 2.17.0 (#1087 ) See: - https://github.com/FasterXML/jackson/wiki/Jackson-Release-2.17 - https://github.com/FasterXML/jackson-bom/compare/jackson-bom-2.16.2...jackson-bom-2.17.0	2024-03-18 07:14:09 +01:00
Rick Ossendrijver	df0eb9ee2f	Drop unused field in `Slf4jLogStatementTest` (#1084 )	2024-03-17 10:49:53 +01:00
Stephan Schroevers	e3cda3ea49	[maven-release-plugin] prepare for next development iteration	2024-03-15 13:04:44 +01:00