Introduce SpringTestRules Refaster rule collection

See:
- https://github.com/uber/NullAway/blob/master/CHANGELOG.md
- https://github.com/uber/NullAway/releases/tag/v0.12.5
- https://github.com/uber/NullAway/compare/v0.12.4...v0.12.5

error-prone-contrib/src/main/java/tech/picnic/errorprone/refasterrules/SpringTestRules.java

@@ -0,0 +1,47 @@
+package tech.picnic.errorprone.refasterrules;
+
+import com.google.errorprone.refaster.Refaster;
+import com.google.errorprone.refaster.annotation.AfterTemplate;
+import com.google.errorprone.refaster.annotation.BeforeTemplate;
+import org.springframework.test.json.JsonCompareMode;
+import org.springframework.test.web.reactive.server.WebTestClient.BodyContentSpec;
+import tech.picnic.errorprone.refaster.annotation.OnlineDocumentation;
+
+/** Refaster rules related to Spring Test expressions and statements. */
+@OnlineDocumentation
+final class SpringTestRules {
+  private SpringTestRules() {}
+
+  /**
+   * Prefer {@link BodyContentSpec#json(String, JsonCompareMode)} over alternatives that implicitly
+   * perform a {@link JsonCompareMode#LENIENT lenient} comparison or are deprecated.
+   */
+  static final class BodyContentSpecJsonLenient {
+    @BeforeTemplate
+    @SuppressWarnings("deprecation" /* This deprecated method invocation will be rewritten. */)
+    BodyContentSpec before(BodyContentSpec spec, String expectedJson) {
+      return Refaster.anyOf(spec.json(expectedJson), spec.json(expectedJson, /* strict= */ false));
+    }
+
+    @AfterTemplate
+    BodyContentSpec after(BodyContentSpec spec, String expectedJson) {
+      return spec.json(expectedJson, JsonCompareMode.LENIENT);
+    }
+  }
+
+  /**
+   * Prefer {@link BodyContentSpec#json(String, JsonCompareMode)} over the deprecated alternative.
+   */
+  static final class BodyContentSpecJsonStrict {
+    @BeforeTemplate
+    @SuppressWarnings("deprecation" /* This deprecated method invocation will be rewritten. */)
+    BodyContentSpec before(BodyContentSpec spec, String expectedJson) {
+      return spec.json(expectedJson, /* strict= */ true);
+    }
+
+    @AfterTemplate
+    BodyContentSpec after(BodyContentSpec spec, String expectedJson) {
+      return spec.json(expectedJson, JsonCompareMode.STRICT);
+    }
+  }
+}

error-prone-contrib/src/test/java/tech/picnic/errorprone/refasterrules/RefasterRulesTest.java

@@ -73,6 +73,7 @@ final class RefasterRulesTest {
           PrimitiveRules.class,
           ReactorRules.class,
           RxJava2AdapterRules.class,
+          SpringTestRules.class,
           StreamRules.class,
           StringRules.class,
           SuggestedFixRules.class,

error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/SpringTestRulesTestInput.java

@@ -0,0 +1,18 @@
+package tech.picnic.errorprone.refasterrules;
+
+import com.google.common.collect.ImmutableSet;
+import org.springframework.test.web.reactive.server.WebTestClient.BodyContentSpec;
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
+
+final class SpringTestRulesTest implements RefasterRuleCollectionTestCase {
+  @SuppressWarnings("deprecation" /* Rule rewrites deprecated method invocation. */)
+  ImmutableSet<BodyContentSpec> testBodyContentSpecJsonLenient() {
+    return ImmutableSet.of(
+        ((BodyContentSpec) null).json("foo"), ((BodyContentSpec) null).json("bar", false));
+  }
+
+  @SuppressWarnings("deprecation" /* Rule rewrites deprecated method invocation. */)
+  BodyContentSpec testBodyContentSpecJsonStrict() {
+    return ((BodyContentSpec) null).json("foo", true);
+  }
+}

error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/SpringTestRulesTestOutput.java

@@ -0,0 +1,20 @@
+package tech.picnic.errorprone.refasterrules;
+
+import com.google.common.collect.ImmutableSet;
+import org.springframework.test.json.JsonCompareMode;
+import org.springframework.test.web.reactive.server.WebTestClient.BodyContentSpec;
+import tech.picnic.errorprone.refaster.test.RefasterRuleCollectionTestCase;
+
+final class SpringTestRulesTest implements RefasterRuleCollectionTestCase {
+  @SuppressWarnings("deprecation" /* Rule rewrites deprecated method invocation. */)
+  ImmutableSet<BodyContentSpec> testBodyContentSpecJsonLenient() {
+    return ImmutableSet.of(
+        ((BodyContentSpec) null).json("foo", JsonCompareMode.LENIENT),
+        ((BodyContentSpec) null).json("bar", JsonCompareMode.LENIENT));
+  }
+
+  @SuppressWarnings("deprecation" /* Rule rewrites deprecated method invocation. */)
+  BodyContentSpec testBodyContentSpecJsonStrict() {
+    return ((BodyContentSpec) null).json("foo", JsonCompareMode.STRICT);
+  }
+}

pom.xml

@@ -213,7 +213,7 @@
         <version.maven>3.9.9</version.maven>
         <version.mockito>5.16.1</version.mockito>
         <version.nopen-checker>1.0.1</version.nopen-checker>
-        <version.nullaway>0.12.4</version.nullaway>
+        <version.nullaway>0.12.5</version.nullaway>
         <version.pitest-git>2.2.0</version.pitest-git>
         <version.rewrite-templating>1.24.1</version.rewrite-templating>
         <version.surefire>3.2.3</version.surefire>