Apply suggestions

New method: `RefasterCollectionTestUtil#validateTemplateCollection`.

This can verify that all Refaster templates from a given template
collection are covered by at least one test and that the match rewrites
code in the correct test method.

Introduce the following modules:
- `refaster-runner`
- `refaster-test-support`

error-prone-contrib/pom.xml

@@ -51,6 +51,11 @@
             <groupId>${project.groupId}</groupId>
             <artifactId>refaster-support</artifactId>
         </dependency>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>refaster-test-support</artifactId>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-annotations</artifactId>

error-prone-contrib/src/test/java/tech/picnic/errorprone/bugpatterns/RefasterCheckTest.java

@@ -1,172 +0,0 @@
-package tech.picnic.errorprone.bugpatterns;
-
-import static com.google.common.collect.ImmutableSetMultimap.toImmutableSetMultimap;
-import static java.util.function.Function.identity;
-import static java.util.function.Predicate.not;
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.assertThatCode;
-import static org.junit.jupiter.params.provider.Arguments.arguments;
-
-import com.google.common.collect.ImmutableSet;
-import com.google.common.collect.ImmutableSetMultimap;
-import com.google.errorprone.BugCheckerRefactoringTestHelper;
-import com.google.errorprone.BugCheckerRefactoringTestHelper.TestMode;
-import java.util.regex.Pattern;
-import java.util.stream.Stream;
-import org.junit.jupiter.api.Test;
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.Arguments;
-import org.junit.jupiter.params.provider.MethodSource;
-
-public final class RefasterCheckTest {
-  /** The names of all Refaster template groups defined in this module. */
-  private static final ImmutableSet<String> TEMPLATE_GROUPS =
-      ImmutableSet.of(
-          "AssertJ",
-          "AssertJBigDecimal",
-          "AssertJBigInteger",
-          "AssertJBoolean",
-          "AssertJByte",
-          "AssertJCharSequence",
-          "AssertJDouble",
-          "AssertJEnumerable",
-          "AssertJFloat",
-          "AssertJInteger",
-          "AssertJLong",
-          "AssertJNumber",
-          "AssertJObject",
-          "AssertJOptional",
-          "AssertJShort",
-          "AssertJString",
-          "Assorted",
-          "BigDecimal",
-          "Collection",
-          "Comparator",
-          "DoubleStream",
-          "Equality",
-          "ImmutableList",
-          "ImmutableListMultimap",
-          "ImmutableMap",
-          "ImmutableMultiset",
-          "ImmutableSet",
-          "ImmutableSetMultimap",
-          "ImmutableSortedMap",
-          "ImmutableSortedMultiset",
-          "ImmutableSortedSet",
-          "IntStream",
-          "JUnit",
-          "LongStream",
-          "MapEntry",
-          "Mockito",
-          "Multimap",
-          "Null",
-          "Optional",
-          "Primitive",
-          "Reactor",
-          "RxJava2Adapter",
-          "Stream",
-          "String",
-          "TestNGToAssertJ",
-          "Time",
-          "WebClient");
-  /**
-   * Matches the parts of the fully-qualified name of a template class that should be removed in
-   * order to produce the associated {@link #TEMPLATE_GROUPS template group name}.
-   */
-  private static final Pattern TEMPLATE_FQCN_TRIM_FOR_GROUP_NAME =
-      Pattern.compile(".*\\.|Templates\\$.*");
-  /**
-   * A mapping from template group names to associated template names.
-   *
-   * <p>In effect, the values correspond to nested classes that represent individual Refaster
-   * templates, while the keys correspond to the associated top-level "aggregator" classes.
-   */
-  private static final ImmutableSetMultimap<String, String> TEMPLATES_BY_GROUP =
-      indexTemplateNamesByGroup(RefasterCheck.ALL_CODE_TRANSFORMERS.get().keySet());
-
-  /** Returns every known template group name as a parameterized test argument. */
-  @SuppressWarnings("UnusedMethod" /* Used as a `@MethodSource`. */)
-  private static Stream<Arguments> templateGroupsUnderTest() {
-    // XXX: Drop the filter once we have added tests for AssertJ!
-    return TEMPLATES_BY_GROUP.keySet().stream().filter(not("AssertJ"::equals)).map(Arguments::of);
-  }
-
-  /**
-   * Returns every known (template group name, template name) pair as a parameterized test argument.
-   */
-  @SuppressWarnings("UnusedMethod" /* Used as a `@MethodSource`. */)
-  private static Stream<Arguments> templatesUnderTest() {
-    // XXX: Drop the filter once we have added tests for AssertJ!
-    return TEMPLATES_BY_GROUP.entries().stream()
-        .filter(e -> !"AssertJ".equals(e.getKey()))
-        .map(e -> arguments(e.getKey(), e.getValue()));
-  }
-
-  /**
-   * Verifies that {@link RefasterCheck#loadAllCodeTransformers} finds at least one code transformer
-   * for all of the {@link #TEMPLATE_GROUPS}.
-   *
-   * <p>This test is just as much about ensuring that {@link #TEMPLATE_GROUPS} is exhaustive, so
-   * that in turn {@link #replacement}'s coverage is exhaustive.
-   */
-  @Test
-  void loadAllCodeTransformers() {
-    assertThat(TEMPLATES_BY_GROUP.keySet()).hasSameElementsAs(TEMPLATE_GROUPS);
-  }
-
-  /**
-   * Verifies for each of the {@link #TEMPLATE_GROUPS} that the associated code transformers have
-   * the desired effect.
-   */
-  @MethodSource("templateGroupsUnderTest")
-  @ParameterizedTest
-  void replacement(String group) {
-    verifyRefactoring(group, namePattern(group));
-  }
-
-  /**
-   * Verifies that all loaded Refaster templates are covered by at least one test.
-   *
-   * <p>Note that this doesn't guarantee full coverage: this test cannot ascertain that all {@link
-   * com.google.errorprone.refaster.Refaster#anyOf} branches are tested. Idem for {@link
-   * com.google.errorprone.refaster.annotation.BeforeTemplate} methods in case there are multiple .
-   */
-  @MethodSource("templatesUnderTest")
-  @ParameterizedTest
-  void coverage(String group, String template) {
-    assertThatCode(() -> verifyRefactoring(group, namePattern(group, template)))
-        .withFailMessage(
-            "Template %s does not affect the tests for group %s; is it tested?", template, group)
-        .isInstanceOf(AssertionError.class)
-        .hasMessageFindingMatch("^(diff|expected):");
-  }
-
-  private static ImmutableSetMultimap<String, String> indexTemplateNamesByGroup(
-      ImmutableSet<String> templateNames) {
-    return templateNames.stream()
-        .collect(
-            toImmutableSetMultimap(
-                n -> TEMPLATE_FQCN_TRIM_FOR_GROUP_NAME.matcher(n).replaceAll(""), identity()));
-  }
-
-  private static String namePattern(String groupName, String excludedTemplate) {
-    return "(?!" + Pattern.quote(excludedTemplate) + ')' + namePattern(groupName);
-  }
-
-  private static String namePattern(String groupName) {
-    return Pattern.compile(Pattern.quote(groupName)) + "Templates.*";
-  }
-
-  private void verifyRefactoring(String groupName, String templateNamePattern) {
-    createRestrictedRefactoringTestHelper(templateNamePattern)
-        .addInput(groupName + "TemplatesTestInput.java")
-        .addOutput(groupName + "TemplatesTestOutput.java")
-        .doTest(TestMode.TEXT_MATCH);
-  }
-
-  private BugCheckerRefactoringTestHelper createRestrictedRefactoringTestHelper(
-      String namePattern) {
-    return BugCheckerRefactoringTestHelper.newInstance(RefasterCheck.class, getClass())
-        .setArgs("-XepOpt:Refaster:NamePattern=" + namePattern);
-  }
-}

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJBigDecimalTemplatesTestInput.java

@@ -7,6 +7,7 @@ import static org.assertj.core.data.Percentage.withPercentage;
 import com.google.common.collect.ImmutableSet;
 import java.math.BigDecimal;
 import org.assertj.core.api.AbstractBigDecimalAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJBigDecimalTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJBigDecimalTemplatesTestOutput.java

@@ -7,6 +7,7 @@ import static org.assertj.core.data.Percentage.withPercentage;
 import com.google.common.collect.ImmutableSet;
 import java.math.BigDecimal;
 import org.assertj.core.api.AbstractBigDecimalAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJBigDecimalTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJBigIntegerTemplatesTestInput.java

@@ -7,6 +7,7 @@ import static org.assertj.core.data.Percentage.withPercentage;
 import com.google.common.collect.ImmutableSet;
 import java.math.BigInteger;
 import org.assertj.core.api.AbstractBigIntegerAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJBigIntegerTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJBigIntegerTemplatesTestOutput.java

@@ -7,6 +7,7 @@ import static org.assertj.core.data.Percentage.withPercentage;
 import com.google.common.collect.ImmutableSet;
 import java.math.BigInteger;
 import org.assertj.core.api.AbstractBigIntegerAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJBigIntegerTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJBooleanTemplatesTestInput.java

@@ -4,6 +4,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 
 import com.google.common.collect.ImmutableSet;
 import org.assertj.core.api.AbstractBooleanAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJBooleanTemplatesTest implements RefasterTemplateTestCase {
   AbstractBooleanAssert<?> testAbstractBooleanAssertIsEqualTo() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJBooleanTemplatesTestOutput.java

@@ -4,6 +4,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 
 import com.google.common.collect.ImmutableSet;
 import org.assertj.core.api.AbstractBooleanAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJBooleanTemplatesTest implements RefasterTemplateTestCase {
   AbstractBooleanAssert<?> testAbstractBooleanAssertIsEqualTo() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJByteTemplatesTestInput.java

@@ -6,6 +6,7 @@ import static org.assertj.core.data.Percentage.withPercentage;
 
 import com.google.common.collect.ImmutableSet;
 import org.assertj.core.api.AbstractByteAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJByteTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJByteTemplatesTestOutput.java

@@ -6,6 +6,7 @@ import static org.assertj.core.data.Percentage.withPercentage;
 
 import com.google.common.collect.ImmutableSet;
 import org.assertj.core.api.AbstractByteAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJByteTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJCharSequenceTemplatesTestInput.java

@@ -4,6 +4,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 
 import com.google.common.collect.ImmutableSet;
 import org.assertj.core.api.AbstractAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJCharSequenceTemplatesTest implements RefasterTemplateTestCase {
   void testAssertThatCharSequenceIsEmpty1() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJCharSequenceTemplatesTestOutput.java

@@ -4,6 +4,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 
 import com.google.common.collect.ImmutableSet;
 import org.assertj.core.api.AbstractAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJCharSequenceTemplatesTest implements RefasterTemplateTestCase {
   void testAssertThatCharSequenceIsEmpty1() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJDoubleTemplatesTestInput.java

@@ -6,6 +6,7 @@ import static org.assertj.core.data.Percentage.withPercentage;
 
 import com.google.common.collect.ImmutableSet;
 import org.assertj.core.api.AbstractDoubleAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJDoubleTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJDoubleTemplatesTestOutput.java

@@ -6,6 +6,7 @@ import static org.assertj.core.data.Percentage.withPercentage;
 
 import com.google.common.collect.ImmutableSet;
 import org.assertj.core.api.AbstractDoubleAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJDoubleTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJEnumerableTemplatesTestInput.java

@@ -5,6 +5,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Iterables;
 import org.assertj.core.api.EnumerableAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJEnumableTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJEnumerableTemplatesTestOutput.java

@@ -5,6 +5,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Iterables;
 import org.assertj.core.api.EnumerableAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJEnumableTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJFloatTemplatesTestInput.java

@@ -6,6 +6,7 @@ import static org.assertj.core.data.Percentage.withPercentage;
 
 import com.google.common.collect.ImmutableSet;
 import org.assertj.core.api.AbstractFloatAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJFloatTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJFloatTemplatesTestOutput.java

@@ -6,6 +6,7 @@ import static org.assertj.core.data.Percentage.withPercentage;
 
 import com.google.common.collect.ImmutableSet;
 import org.assertj.core.api.AbstractFloatAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJFloatTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJIntegerTemplatesTestInput.java

@@ -6,6 +6,7 @@ import static org.assertj.core.data.Percentage.withPercentage;
 
 import com.google.common.collect.ImmutableSet;
 import org.assertj.core.api.AbstractIntegerAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJIntegerTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJIntegerTemplatesTestOutput.java

@@ -6,6 +6,7 @@ import static org.assertj.core.data.Percentage.withPercentage;
 
 import com.google.common.collect.ImmutableSet;
 import org.assertj.core.api.AbstractIntegerAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJIntegerTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJLongTemplatesTestInput.java

@@ -6,6 +6,7 @@ import static org.assertj.core.data.Percentage.withPercentage;
 
 import com.google.common.collect.ImmutableSet;
 import org.assertj.core.api.AbstractLongAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJLongTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJLongTemplatesTestOutput.java

@@ -6,6 +6,7 @@ import static org.assertj.core.data.Percentage.withPercentage;
 
 import com.google.common.collect.ImmutableSet;
 import org.assertj.core.api.AbstractLongAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJLongTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJNumberTemplatesTestInput.java

@@ -6,6 +6,7 @@ import com.google.common.collect.ImmutableSet;
 import java.math.BigDecimal;
 import java.math.BigInteger;
 import org.assertj.core.api.NumberAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJNumberTemplatesTest implements RefasterTemplateTestCase {
   ImmutableSet<NumberAssert<?, ?>> testAbstractIntegerAssertIsPositive() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJNumberTemplatesTestOutput.java

@@ -6,6 +6,7 @@ import com.google.common.collect.ImmutableSet;
 import java.math.BigDecimal;
 import java.math.BigInteger;
 import org.assertj.core.api.NumberAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJNumberTemplatesTest implements RefasterTemplateTestCase {
   ImmutableSet<NumberAssert<?, ?>> testAbstractIntegerAssertIsPositive() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJObjectTemplatesTestInput.java

@@ -3,6 +3,7 @@ package tech.picnic.errorprone.bugpatterns;
 import static org.assertj.core.api.Assertions.assertThat;
 
 import org.assertj.core.api.AbstractAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJObjectTemplatesTest implements RefasterTemplateTestCase {
   AbstractAssert<?, ?> testAssertThatIsInstanceOf() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJObjectTemplatesTestOutput.java

@@ -3,6 +3,7 @@ package tech.picnic.errorprone.bugpatterns;
 import static org.assertj.core.api.Assertions.assertThat;
 
 import org.assertj.core.api.AbstractAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJObjectTemplatesTest implements RefasterTemplateTestCase {
   AbstractAssert<?, ?> testAssertThatIsInstanceOf() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJOptionalTemplatesTestInput.java

@@ -6,6 +6,7 @@ import com.google.common.collect.ImmutableSet;
 import java.util.Optional;
 import org.assertj.core.api.AbstractAssert;
 import org.assertj.core.api.OptionalAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJOptionalTemplatesTest implements RefasterTemplateTestCase {
   AbstractAssert<?, ?> testAssertThatOptional() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJOptionalTemplatesTestOutput.java

@@ -6,6 +6,7 @@ import com.google.common.collect.ImmutableSet;
 import java.util.Optional;
 import org.assertj.core.api.AbstractAssert;
 import org.assertj.core.api.OptionalAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJOptionalTemplatesTest implements RefasterTemplateTestCase {
   AbstractAssert<?, ?> testAssertThatOptional() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJShortTemplatesTestInput.java

@@ -6,6 +6,7 @@ import static org.assertj.core.data.Percentage.withPercentage;
 
 import com.google.common.collect.ImmutableSet;
 import org.assertj.core.api.AbstractShortAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJShortTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJShortTemplatesTestOutput.java

@@ -6,6 +6,7 @@ import static org.assertj.core.data.Percentage.withPercentage;
 
 import com.google.common.collect.ImmutableSet;
 import org.assertj.core.api.AbstractShortAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJShortTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJStringTemplatesTestInput.java

@@ -4,6 +4,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 
 import org.assertj.core.api.AbstractAssert;
 import org.assertj.core.api.AbstractStringAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJStringTemplatesTest implements RefasterTemplateTestCase {
   void testAbstractStringAssertStringIsEmpty() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssertJStringTemplatesTestOutput.java

@@ -4,6 +4,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 
 import org.assertj.core.api.AbstractAssert;
 import org.assertj.core.api.AbstractStringAssert;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssertJStringTemplatesTest implements RefasterTemplateTestCase {
   void testAbstractStringAssertStringIsEmpty() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssortedTemplatesTestInput.java

@@ -17,6 +17,7 @@ import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssortedTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/AssortedTemplatesTestOutput.java

@@ -21,6 +21,7 @@ import java.util.HashSet;
 import java.util.Map;
 import java.util.Objects;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class AssortedTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/BigDecimalTemplatesTestInput.java

@@ -2,6 +2,7 @@ package tech.picnic.errorprone.bugpatterns;
 
 import com.google.common.collect.ImmutableSet;
 import java.math.BigDecimal;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class BigDecimalTemplatesTest implements RefasterTemplateTestCase {
   ImmutableSet<BigDecimal> testBigDecimalZero() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/BigDecimalTemplatesTestOutput.java

@@ -2,6 +2,7 @@ package tech.picnic.errorprone.bugpatterns;
 
 import com.google.common.collect.ImmutableSet;
 import java.math.BigDecimal;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class BigDecimalTemplatesTest implements RefasterTemplateTestCase {
   ImmutableSet<BigDecimal> testBigDecimalZero() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/CollectionTemplatesTestInput.java

@@ -11,6 +11,7 @@ import java.util.LinkedList;
 import java.util.Optional;
 import java.util.TreeSet;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class CollectionTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/CollectionTemplatesTestOutput.java

@@ -11,6 +11,7 @@ import java.util.LinkedList;
 import java.util.Optional;
 import java.util.TreeSet;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class CollectionTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ComparatorTemplatesTestInput.java

@@ -8,6 +8,7 @@ import com.google.common.collect.ImmutableSet;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.Comparator;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ComparatorTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ComparatorTemplatesTestOutput.java

@@ -10,6 +10,7 @@ import com.google.common.collect.ImmutableSet;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.Comparator;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ComparatorTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/DoubleStreamTemplatesTestInput.java

@@ -6,6 +6,7 @@ import java.util.OptionalDouble;
 import java.util.function.DoublePredicate;
 import java.util.stream.DoubleStream;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class DoubleStreamTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/DoubleStreamTemplatesTestOutput.java

@@ -6,6 +6,7 @@ import java.util.OptionalDouble;
 import java.util.function.DoublePredicate;
 import java.util.stream.DoubleStream;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class DoubleStreamTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/EqualityTemplatesTestInput.java

@@ -5,6 +5,7 @@ import com.google.common.collect.ImmutableSet;
 import java.math.RoundingMode;
 import java.util.Objects;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class EqualityTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/EqualityTemplatesTestOutput.java

@@ -5,6 +5,7 @@ import com.google.common.collect.ImmutableSet;
 import java.math.RoundingMode;
 import java.util.Objects;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class EqualityTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableListMultimapTemplatesTestInput.java

@@ -16,6 +16,7 @@ import com.google.common.collect.Streams;
 import com.google.common.collect.TreeMultimap;
 import java.util.Map;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableListMultimapTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableListMultimapTemplatesTestOutput.java

@@ -16,6 +16,7 @@ import com.google.common.collect.Streams;
 import com.google.common.collect.TreeMultimap;
 import java.util.Map;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableListMultimapTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableListTemplatesTestInput.java

@@ -13,6 +13,7 @@ import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableListTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableListTemplatesTestOutput.java

@@ -14,6 +14,7 @@ import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableListTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableMapTemplatesTestInput.java

@@ -12,6 +12,7 @@ import com.google.common.collect.Streams;
 import java.util.Collections;
 import java.util.Map;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableMapTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableMapTemplatesTestOutput.java

@@ -12,6 +12,7 @@ import com.google.common.collect.Streams;
 import java.util.Collections;
 import java.util.Map;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableMapTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableMultisetTemplatesTestInput.java

@@ -10,6 +10,7 @@ import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Streams;
 import java.util.Arrays;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableMultisetTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableMultisetTemplatesTestOutput.java

@@ -10,6 +10,7 @@ import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Streams;
 import java.util.Arrays;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableMultisetTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableSetMultimapTemplatesTestInput.java

@@ -13,6 +13,7 @@ import com.google.common.collect.Streams;
 import com.google.common.collect.TreeMultimap;
 import java.util.Map;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableSetMultimapTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableSetMultimapTemplatesTestOutput.java

@@ -13,6 +13,7 @@ import com.google.common.collect.Streams;
 import com.google.common.collect.TreeMultimap;
 import java.util.Map;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableSetMultimapTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableSetTemplatesTestInput.java

@@ -13,6 +13,7 @@ import java.util.Arrays;
 import java.util.Collections;
 import java.util.Set;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableSetTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableSetTemplatesTestOutput.java

@@ -13,6 +13,7 @@ import java.util.Arrays;
 import java.util.Collections;
 import java.util.Set;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableSetTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableSortedMapTemplatesTestInput.java

@@ -10,6 +10,7 @@ import com.google.common.collect.Streams;
 import java.util.Comparator;
 import java.util.Map;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableSortedMapTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableSortedMapTemplatesTestOutput.java

@@ -10,6 +10,7 @@ import com.google.common.collect.Streams;
 import java.util.Comparator;
 import java.util.Map;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableSortedMapTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableSortedMultisetTemplatesTestInput.java

@@ -13,6 +13,7 @@ import com.google.common.collect.Streams;
 import java.util.Arrays;
 import java.util.Comparator;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableSortedMultisetTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableSortedMultisetTemplatesTestOutput.java

@@ -13,6 +13,7 @@ import com.google.common.collect.Streams;
 import java.util.Arrays;
 import java.util.Comparator;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableSortedMultisetTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableSortedSetTemplatesTestInput.java

@@ -12,6 +12,7 @@ import com.google.common.collect.Streams;
 import java.util.Arrays;
 import java.util.Comparator;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableSortedSetTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ImmutableSortedSetTemplatesTestOutput.java

@@ -12,6 +12,7 @@ import com.google.common.collect.Streams;
 import java.util.Arrays;
 import java.util.Comparator;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ImmutableSortedSetTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/IntStreamTemplatesTestInput.java

@@ -6,6 +6,7 @@ import java.util.OptionalInt;
 import java.util.function.IntPredicate;
 import java.util.stream.IntStream;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class IntStreamTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/IntStreamTemplatesTestOutput.java

@@ -6,6 +6,7 @@ import java.util.OptionalInt;
 import java.util.function.IntPredicate;
 import java.util.stream.IntStream;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class IntStreamTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/JUnitTemplatesTestInput.java

@@ -2,6 +2,7 @@ package tech.picnic.errorprone.bugpatterns;
 
 import com.google.common.collect.ImmutableSet;
 import org.junit.jupiter.params.provider.Arguments;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class JUnitTemplatesTest implements RefasterTemplateTestCase {
   ImmutableSet<Arguments> testArgumentsEnumeration() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/JUnitTemplatesTestOutput.java

@@ -4,6 +4,7 @@ import static org.junit.jupiter.params.provider.Arguments.arguments;
 
 import com.google.common.collect.ImmutableSet;
 import org.junit.jupiter.params.provider.Arguments;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class JUnitTemplatesTest implements RefasterTemplateTestCase {
   ImmutableSet<Arguments> testArgumentsEnumeration() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/LongStreamTemplatesTestInput.java

@@ -6,6 +6,7 @@ import java.util.OptionalLong;
 import java.util.function.LongPredicate;
 import java.util.stream.LongStream;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class LongStreamTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/LongStreamTemplatesTestOutput.java

@@ -6,6 +6,7 @@ import java.util.OptionalLong;
 import java.util.function.LongPredicate;
 import java.util.stream.LongStream;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class LongStreamTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/MapEntryTemplatesTestInput.java

@@ -5,6 +5,7 @@ import com.google.common.collect.Maps;
 import java.util.AbstractMap;
 import java.util.Comparator;
 import java.util.Map;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class MapEntryTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/MapEntryTemplatesTestOutput.java

@@ -8,6 +8,7 @@ import com.google.common.collect.Maps;
 import java.util.AbstractMap;
 import java.util.Comparator;
 import java.util.Map;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class MapEntryTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/MockitoTemplatesTestInput.java

@@ -6,6 +6,7 @@ import static org.mockito.Mockito.verify;
 
 import com.google.common.collect.ImmutableSet;
 import org.mockito.verification.VerificationMode;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class MockitoTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/MockitoTemplatesTestOutput.java

@@ -7,6 +7,7 @@ import static org.mockito.Mockito.verify;
 
 import com.google.common.collect.ImmutableSet;
 import org.mockito.verification.VerificationMode;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class MockitoTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/MultimapTemplatesTestInput.java

@@ -6,6 +6,7 @@ import com.google.common.collect.Multimap;
 import com.google.common.collect.Multimaps;
 import java.util.Collection;
 import java.util.Set;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class MultimapTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/MultimapTemplatesTestOutput.java

@@ -6,6 +6,7 @@ import com.google.common.collect.Multimap;
 import com.google.common.collect.Multimaps;
 import java.util.Collection;
 import java.util.Set;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class MultimapTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/NullTemplatesTestInput.java

@@ -3,6 +3,7 @@ package tech.picnic.errorprone.bugpatterns;
 import com.google.common.base.MoreObjects;
 import com.google.common.collect.ImmutableSet;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class NullTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/NullTemplatesTestOutput.java

@@ -6,6 +6,7 @@ import com.google.common.base.MoreObjects;
 import com.google.common.collect.ImmutableSet;
 import java.util.Objects;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class NullTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/OptionalTemplatesTestInput.java

@@ -5,6 +5,7 @@ import com.google.common.collect.Streams;
 import java.util.Optional;
 import java.util.function.Function;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class OptionalTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/OptionalTemplatesTestOutput.java

@@ -7,6 +7,7 @@ import com.google.common.collect.Streams;
 import java.util.Optional;
 import java.util.function.Function;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class OptionalTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/PrimitiveTemplatesTestInput.java

@@ -2,6 +2,7 @@ package tech.picnic.errorprone.bugpatterns;
 
 import com.google.common.collect.ImmutableSet;
 import com.google.common.primitives.Ints;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class PrimitiveTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/PrimitiveTemplatesTestOutput.java

@@ -2,6 +2,7 @@ package tech.picnic.errorprone.bugpatterns;
 
 import com.google.common.collect.ImmutableSet;
 import com.google.common.primitives.Ints;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class PrimitiveTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ReactorTemplatesTestInput.java

@@ -9,6 +9,7 @@ import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 import reactor.test.StepVerifier;
 import reactor.test.publisher.PublisherProbe;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ReactorTemplatesTest implements RefasterTemplateTestCase {
   ImmutableSet<Mono<Integer>> testMonoFromOptional() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/ReactorTemplatesTestOutput.java

@@ -11,6 +11,7 @@ import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 import reactor.test.StepVerifier;
 import reactor.test.publisher.PublisherProbe;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class ReactorTemplatesTest implements RefasterTemplateTestCase {
   ImmutableSet<Mono<Integer>> testMonoFromOptional() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/RxJava2AdapterTemplatesTestInput.java

@@ -12,6 +12,7 @@ import org.reactivestreams.Publisher;
 import reactor.adapter.rxjava.RxJava2Adapter;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class RxJava2AdapterTemplatesTest implements RefasterTemplateTestCase {
   ImmutableSet<Mono<Void>> testCompletableToMono() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/RxJava2AdapterTemplatesTestOutput.java

@@ -12,6 +12,7 @@ import org.reactivestreams.Publisher;
 import reactor.adapter.rxjava.RxJava2Adapter;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class RxJava2AdapterTemplatesTest implements RefasterTemplateTestCase {
   ImmutableSet<Mono<Void>> testCompletableToMono() {

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/StreamTemplatesTestInput.java

@@ -10,6 +10,7 @@ import java.util.Objects;
 import java.util.Optional;
 import java.util.function.Predicate;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class StreamTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/StreamTemplatesTestOutput.java

@@ -12,6 +12,7 @@ import java.util.Objects;
 import java.util.Optional;
 import java.util.function.Predicate;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class StreamTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/StringTemplatesTestInput.java

@@ -12,6 +12,7 @@ import com.google.common.collect.Streams;
 import java.util.Arrays;
 import java.util.Optional;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class StringTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/StringTemplatesTestOutput.java

@@ -13,6 +13,7 @@ import com.google.common.collect.Streams;
 import java.util.Arrays;
 import java.util.Optional;
 import java.util.stream.Stream;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class StringTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/TestNGToAssertJTemplatesTestInput.java

@@ -17,6 +17,7 @@ import com.google.common.collect.Iterables;
 import com.google.common.collect.Iterators;
 import java.util.ArrayList;
 import java.util.Collections;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class TestNGToAssertJTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/TestNGToAssertJTemplatesTestOutput.java

@@ -22,6 +22,7 @@ import com.google.common.collect.Iterables;
 import com.google.common.collect.Iterators;
 import java.util.ArrayList;
 import java.util.Collections;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class TestNGToAssertJTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/TimeTemplatesTestInput.java

@@ -13,6 +13,7 @@ import java.time.ZoneId;
 import java.time.ZoneOffset;
 import java.time.ZonedDateTime;
 import java.time.temporal.ChronoUnit;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class TimeTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/TimeTemplatesTestOutput.java

@@ -13,6 +13,7 @@ import java.time.ZoneId;
 import java.time.ZoneOffset;
 import java.time.ZonedDateTime;
 import java.time.temporal.ChronoUnit;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class TimeTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/WebClientTemplatesTestInput.java

@@ -5,6 +5,7 @@ import static org.springframework.web.reactive.function.BodyInserters.fromValue;
 import com.google.common.collect.ImmutableSet;
 import org.springframework.test.web.reactive.server.WebTestClient;
 import org.springframework.web.reactive.function.client.WebClient;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class WebClientTemplatesTest implements RefasterTemplateTestCase {
   @Override

error-prone-contrib/src/test/resources/tech/picnic/errorprone/bugpatterns/WebClientTemplatesTestOutput.java

@@ -5,6 +5,7 @@ import static org.springframework.web.reactive.function.BodyInserters.fromValue;
 import com.google.common.collect.ImmutableSet;
 import org.springframework.test.web.reactive.server.WebTestClient;
 import org.springframework.web.reactive.function.client.WebClient;
+import tech.picnic.errorprone.refaster.test.RefasterTemplateTestCase;
 
 final class WebClientTemplatesTest implements RefasterTemplateTestCase {
   @Override

pom.xml

@@ -35,7 +35,9 @@
     <modules>
         <module>error-prone-contrib</module>
         <module>refaster-resource-compiler</module>
+        <module>refaster-runner</module>
         <module>refaster-support</module>
+        <module>refaster-test-support</module>
     </modules>
 
     <scm>
@@ -182,11 +184,21 @@
                 <artifactId>refaster-resource-compiler</artifactId>
                 <version>${project.version}</version>
             </dependency>
+            <dependency>
+                <groupId>${project.groupId}</groupId>
+                <artifactId>refaster-runner</artifactId>
+                <version>${project.version}</version>
+            </dependency>
             <dependency>
                 <groupId>${project.groupId}</groupId>
                 <artifactId>refaster-support</artifactId>
                 <version>${project.version}</version>
             </dependency>
+            <dependency>
+                <groupId>${project.groupId}</groupId>
+                <artifactId>refaster-test-support</artifactId>
+                <version>${project.version}</version>
+            </dependency>
             <dependency>
                 <groupId>com.fasterxml.jackson</groupId>
                 <artifactId>jackson-bom</artifactId>

refaster-runner/pom.xml

@@ -0,0 +1,53 @@
+<?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>0.0.1-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>refaster-runner</artifactId>
+
+    <name>Picnic :: Error Prone Support :: Refaster Runner</name>
+    <description>Apply Refaster templates found on the classpath.</description>
+
+    <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>com.google.auto.service</groupId>
+            <artifactId>auto-service-annotations</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.errorprone</groupId>
+            <artifactId>javac</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+</project>

refaster-runner/src/main/java/tech/picnic/errorprone/refaster/runner/CodeTransformers.java

@@ -0,0 +1,76 @@
+package tech.picnic.errorprone.refaster.runner;
+
+import com.google.common.collect.ImmutableListMultimap;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.reflect.ClassPath;
+import com.google.common.reflect.ClassPath.ResourceInfo;
+import com.google.errorprone.CodeTransformer;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.ObjectInputStream;
+import java.io.UncheckedIOException;
+import java.util.NoSuchElementException;
+import java.util.Optional;
+
+/** Scans the classpath for `.refaster` files and loads them as {@link CodeTransformer}s. */
+public final class CodeTransformers {
+  private static final String REFASTER_TEMPLATE_SUFFIX = ".refaster";
+
+  private CodeTransformers() {}
+
+  /**
+   * Use the classpath to find Refaster templates and return a map of the names with {@link
+   * CodeTransformer}s.
+   *
+   * @return A mapping from Refaster template names to {@link CodeTransformer}s.
+   */
+  public static ImmutableListMultimap<String, CodeTransformer> loadAllCodeTransformers() {
+    ImmutableListMultimap.Builder<String, CodeTransformer> transformers =
+        ImmutableListMultimap.builder();
+
+    for (ResourceInfo resource : getClassPathResources()) {
+      getRefasterTemplateName(resource)
+          .ifPresent(
+              templateName ->
+                  loadCodeTransformer(resource)
+                      .ifPresent(transformer -> transformers.put(templateName, transformer)));
+    }
+
+    return transformers.build();
+  }
+
+  private static ImmutableSet<ResourceInfo> getClassPathResources() {
+    try {
+      return ClassPath.from(ClassLoader.getSystemClassLoader()).getResources();
+    } catch (IOException e) {
+      throw new UncheckedIOException("Failed to scan classpath for resources", e);
+    }
+  }
+
+  private static Optional<String> getRefasterTemplateName(ResourceInfo resource) {
+    String resourceName = resource.getResourceName();
+    if (!resourceName.endsWith(REFASTER_TEMPLATE_SUFFIX)) {
+      return Optional.empty();
+    }
+
+    int lastPathSeparator = resourceName.lastIndexOf('/');
+    int beginIndex = lastPathSeparator < 0 ? 0 : lastPathSeparator + 1;
+    int endIndex = resourceName.length() - REFASTER_TEMPLATE_SUFFIX.length();
+    return Optional.of(resourceName.substring(beginIndex, endIndex));
+  }
+
+  private static Optional<CodeTransformer> loadCodeTransformer(ResourceInfo resource) {
+    try (InputStream in = resource.url().openStream();
+        ObjectInputStream ois = new ObjectInputStream(in)) {
+      @SuppressWarnings("BanSerializableRead" /* Part of the Refaster API. */)
+      CodeTransformer codeTransformer = (CodeTransformer) ois.readObject();
+      return Optional.of(codeTransformer);
+    } catch (NoSuchElementException e) {
+      /* For some reason we can't load the resource. Skip it. */
+      // XXX: Should we log this?
+      return Optional.empty();
+    } catch (IOException | ClassNotFoundException e) {
+      throw new IllegalStateException("Can't load `CodeTransformer` from " + resource, e);
+    }
+  }
+}

refaster-runner/src/main/java/tech/picnic/errorprone/refaster/runner/RefasterCheck.java

@@ -1,32 +1,28 @@
-package tech.picnic.errorprone.bugpatterns;
+package tech.picnic.errorprone.refaster.runner;
 
 import static com.google.common.collect.ImmutableList.toImmutableList;
 import static com.google.common.collect.ImmutableRangeSet.toImmutableRangeSet;
-import static java.util.Objects.requireNonNullElseGet;
+import static com.google.errorprone.BugPattern.LinkType.NONE;
+import static com.google.errorprone.BugPattern.SeverityLevel.SUGGESTION;
+import static com.google.errorprone.BugPattern.StandardTags.SIMPLIFICATION;
 import static java.util.function.Predicate.not;
 
 import com.google.auto.service.AutoService;
-import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Suppliers;
 import com.google.common.collect.ImmutableCollection;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableListMultimap;
 import com.google.common.collect.ImmutableRangeSet;
-import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Range;
 import com.google.common.collect.RangeSet;
 import com.google.common.collect.TreeRangeSet;
-import com.google.common.reflect.ClassPath;
-import com.google.common.reflect.ClassPath.ResourceInfo;
 import com.google.errorprone.BugPattern;
-import com.google.errorprone.BugPattern.LinkType;
-import com.google.errorprone.BugPattern.SeverityLevel;
-import com.google.errorprone.BugPattern.StandardTags;
 import com.google.errorprone.CodeTransformer;
 import com.google.errorprone.CompositeCodeTransformer;
 import com.google.errorprone.ErrorProneFlags;
 import com.google.errorprone.SubContext;
 import com.google.errorprone.VisitorState;
+import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import com.google.errorprone.bugpatterns.BugChecker;
 import com.google.errorprone.bugpatterns.BugChecker.CompilationUnitTreeMatcher;
 import com.google.errorprone.fixes.Replacement;
@@ -34,16 +30,10 @@ import com.google.errorprone.matchers.Description;
 import com.sun.source.tree.CompilationUnitTree;
 import com.sun.tools.javac.tree.EndPosTable;
 import com.sun.tools.javac.tree.JCTree.JCCompilationUnit;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.ObjectInputStream;
-import java.io.UncheckedIOException;
 import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.List;
 import java.util.Map;
-import java.util.NoSuchElementException;
-import java.util.Optional;
 import java.util.function.Supplier;
 import java.util.regex.Pattern;
 import java.util.stream.Stream;
@@ -60,17 +50,17 @@ import java.util.stream.Stream;
 @BugPattern(
     name = "Refaster",
     summary = "Write idiomatic code when possible",
-    linkType = LinkType.NONE,
-    severity = SeverityLevel.SUGGESTION,
-    tags = StandardTags.SIMPLIFICATION)
+    linkType = NONE,
+    severity = SUGGESTION,
+    tags = SIMPLIFICATION)
 public final class RefasterCheck extends BugChecker implements CompilationUnitTreeMatcher {
-  private static final long serialVersionUID = 1L;
-  private static final String REFASTER_TEMPLATE_SUFFIX = ".refaster";
-  private static final String INCLUDED_TEMPLATES_PATTERN_FLAG = "Refaster:NamePattern";
+  /** Flag to pass a pattern that restricts which Refaster templates are loaded. */
+  public static final String INCLUDED_TEMPLATES_PATTERN_FLAG = "Refaster:NamePattern";
+
+  private static final long serialVersionUID = 1L;
 
-  @VisibleForTesting
   static final Supplier<ImmutableListMultimap<String, CodeTransformer>> ALL_CODE_TRANSFORMERS =
-      Suppliers.memoize(RefasterCheck::loadAllCodeTransformers);
+      Suppliers.memoize(CodeTransformers::loadAllCodeTransformers);
 
   private final CodeTransformer codeTransformer;
 
@@ -89,6 +79,7 @@ public final class RefasterCheck extends BugChecker implements CompilationUnitTr
   }
 
   @Override
+  @CanIgnoreReturnValue
   public Description matchCompilationUnit(CompilationUnitTree tree, VisitorState state) {
     /* First, collect all matches. */
     List<Description> matches = new ArrayList<>();
@@ -178,57 +169,4 @@ public final class RefasterCheck extends BugChecker implements CompilationUnitTr
         .map(Map.Entry::getValue)
         .collect(toImmutableList());
   }
-
-  private static ImmutableListMultimap<String, CodeTransformer> loadAllCodeTransformers() {
-    ImmutableListMultimap.Builder<String, CodeTransformer> transformers =
-        ImmutableListMultimap.builder();
-
-    for (ResourceInfo resource : getClassPathResources()) {
-      getRefasterTemplateName(resource)
-          .ifPresent(
-              templateName ->
-                  loadCodeTransformer(resource)
-                      .ifPresent(transformer -> transformers.put(templateName, transformer)));
-    }
-
-    return transformers.build();
-  }
-
-  private static ImmutableSet<ResourceInfo> getClassPathResources() {
-    try {
-      return ClassPath.from(
-              requireNonNullElseGet(
-                  RefasterCheck.class.getClassLoader(), ClassLoader::getSystemClassLoader))
-          .getResources();
-    } catch (IOException e) {
-      throw new UncheckedIOException("Failed to scan classpath for resources", e);
-    }
-  }
-
-  private static Optional<String> getRefasterTemplateName(ResourceInfo resource) {
-    String resourceName = resource.getResourceName();
-    if (!resourceName.endsWith(REFASTER_TEMPLATE_SUFFIX)) {
-      return Optional.empty();
-    }
-
-    int lastPathSeparator = resourceName.lastIndexOf('/');
-    int beginIndex = lastPathSeparator < 0 ? 0 : lastPathSeparator + 1;
-    int endIndex = resourceName.length() - REFASTER_TEMPLATE_SUFFIX.length();
-    return Optional.of(resourceName.substring(beginIndex, endIndex));
-  }
-
-  private static Optional<CodeTransformer> loadCodeTransformer(ResourceInfo resource) {
-    try (InputStream in = resource.url().openStream();
-        ObjectInputStream ois = new ObjectInputStream(in)) {
-      @SuppressWarnings("BanSerializableRead" /* Part of the Refaster API. */)
-      CodeTransformer codeTransformer = (CodeTransformer) ois.readObject();
-      return Optional.of(codeTransformer);
-    } catch (NoSuchElementException e) {
-      /* For some reason we can't load the resource. Skip it. */
-      // XXX: Should we log this?
-      return Optional.empty();
-    } catch (IOException | ClassNotFoundException e) {
-      throw new IllegalStateException("Can't load `CodeTransformer` from " + resource, e);
-    }
-  }
 }

refaster-runner/src/main/java/tech/picnic/errorprone/refaster/runner/package-info.java

@@ -0,0 +1,4 @@
+/** Classes used to find Refaster templates on the classpath and to apply them. */
+@com.google.errorprone.annotations.CheckReturnValue
+@javax.annotation.ParametersAreNonnullByDefault
+package tech.picnic.errorprone.refaster.runner;

refaster-test-support/pom.xml

@@ -0,0 +1,116 @@
+<?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>0.0.1-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>refaster-test-support</artifactId>
+
+    <name>Picnic :: Error Prone Support :: Refaster Test Support</name>
+    <description>Utilities to support with the validation of Refaster templates tests.</description>
+
+    <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_test_helpers</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>refaster-resource-compiler</artifactId>
+            <!-- This dependency is declared only as a hint to Maven that
+            compilation depends on it; see the `maven-compiler-plugin`'s
+            `annotationProcessorPaths` configuration below. -->
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>refaster-runner</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.google.auto.service</groupId>
+            <artifactId>auto-service-annotations</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.code.findbugs</groupId>
+            <artifactId>jsr305</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.errorprone</groupId>
+            <artifactId>javac</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</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-engine</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-params</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>com.coveo</groupId>
+                    <artifactId>fmt-maven-plugin</artifactId>
+                    <configuration>
+                        <additionalSourceDirectories>
+                            <additionalSourceDirectory>${basedir}/src/test/resources</additionalSourceDirectory>
+                        </additionalSourceDirectories>
+                    </configuration>
+                </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-compiler-plugin</artifactId>
+                    <configuration>
+                        <annotationProcessorPaths combine.children="append">
+                            <path>
+                                <groupId>${project.groupId}</groupId>
+                                <artifactId>refaster-resource-compiler</artifactId>
+                                <version>${project.version}</version>
+                            </path>
+                        </annotationProcessorPaths>
+                        <compilerArgs combine.children="append">
+                            <arg>-Xplugin:RefasterRuleResourceCompiler</arg>
+                        </compilerArgs>
+                    </configuration>
+                </plugin>
+            </plugins>
+        </pluginManagement>
+    </build>
+</project>