diff --git a/error-prone-contrib/src/main/java/tech/picnic/errorprone/refasterrules/SpringTestRules.java b/error-prone-contrib/src/main/java/tech/picnic/errorprone/refasterrules/SpringTestRules.java
new file mode 100644
index 0000000000..3a34bf1fde
--- /dev/null
+++ b/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);
+    }
+  }
+}
diff --git a/error-prone-contrib/src/test/java/tech/picnic/errorprone/refasterrules/RefasterRulesTest.java b/error-prone-contrib/src/test/java/tech/picnic/errorprone/refasterrules/RefasterRulesTest.java
index 0d7046f918..d7c5af75f8 100644
--- a/error-prone-contrib/src/test/java/tech/picnic/errorprone/refasterrules/RefasterRulesTest.java
+++ b/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,
diff --git a/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/SpringTestRulesTestInput.java b/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/SpringTestRulesTestInput.java
new file mode 100644
index 0000000000..6b67e8a365
--- /dev/null
+++ b/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);
+  }
+}
diff --git a/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/SpringTestRulesTestOutput.java b/error-prone-contrib/src/test/resources/tech/picnic/errorprone/refasterrules/SpringTestRulesTestOutput.java
new file mode 100644
index 0000000000..85a1651c53
--- /dev/null
+++ b/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);
+  }
+}