Skip TemporaryFolder conversion when used in RuleChain.

src/main/java/org/openrewrite/java/testing/junit5/TemporaryFolderToTempDir.java

@@ -27,6 +27,7 @@
 import org.openrewrite.java.trait.Annotated;
 import org.openrewrite.java.tree.*;
 import org.openrewrite.marker.Markers;
+import org.openrewrite.marker.SearchResult;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -39,6 +40,9 @@
 
 public class TemporaryFolderToTempDir extends Recipe {
 
+    private static final MethodMatcher RULE_CHAIN_OUTER_RULE = new MethodMatcher("org.junit.rules.RuleChain outerRule(org.junit.rules.TestRule)");
+    private static final MethodMatcher RULE_CHAIN_AROUND = new MethodMatcher("org.junit.rules.RuleChain around(org.junit.rules.TestRule)");
+
     @Getter
     final String displayName = "Use JUnit Jupiter `@TempDir`";
 
@@ -48,9 +52,27 @@ public class TemporaryFolderToTempDir extends Recipe {
     @Override
     public TreeVisitor<?, ExecutionContext> getVisitor() {
         return Preconditions.check(
-                new UsesType<>("org.junit.rules.TemporaryFolder", false),
+                Preconditions.and(
+                        new UsesType<>("org.junit.rules.TemporaryFolder", false),
+                        Preconditions.not(new UsesTemporaryFolderInRuleChain())
+                ),
                 new TemporaryFolderToTempDirVisitor());
     }
+
+    private static class UsesTemporaryFolderInRuleChain extends JavaIsoVisitor<ExecutionContext> {
+        @Override
+        public J.MethodInvocation visitMethodInvocation(J.MethodInvocation method, ExecutionContext ctx) {
+            J.MethodInvocation mi = super.visitMethodInvocation(method, ctx);
+            if (RULE_CHAIN_OUTER_RULE.matches(mi) || RULE_CHAIN_AROUND.matches(mi)) {
+                for (Expression arg : mi.getArguments()) {
+                    if (TypeUtils.isOfClassType(arg.getType(), "org.junit.rules.TemporaryFolder")) {
+                        return SearchResult.found(mi);
+                    }
+                }
+            }
+            return mi;
+        }
+    }
 }
 
 class TemporaryFolderToTempDirVisitor extends JavaVisitor<ExecutionContext> {

src/test/java/org/openrewrite/java/testing/junit5/TemporaryFolderToTempDirTest.java

@@ -864,4 +864,53 @@ private static File newFolder(File root, String... subDirs) throws IOException {
           )
         );
     }
+
+    @Test
+    void temporaryFolderInRuleChainShouldNotBeConverted() {
+        //language=java
+        rewriteRun(
+          java(
+            """
+              import org.junit.Rule;
+              import org.junit.rules.RuleChain;
+              import org.junit.rules.TemporaryFolder;
+              import org.junit.rules.TestRule;
+
+              public class MyTest {
+                  private TemporaryFolder tempFolder = new TemporaryFolder();
+
+                  @Rule
+                  public RuleChain chain = RuleChain.outerRule(tempFolder);
+              }
+              """
+          )
+        );
+    }
+
+    @Test
+    void temporaryFolderInRuleChainAroundShouldNotBeConverted() {
+        //language=java
+        rewriteRun(
+          java(
+            """
+              import org.junit.Rule;
+              import org.junit.rules.RuleChain;
+              import org.junit.rules.TemporaryFolder;
+              import org.junit.rules.TestRule;
+              import org.junit.rules.ExternalResource;
+
+              public class MyTest {
+                  private TemporaryFolder tempFolder = new TemporaryFolder();
+                  private ExternalResource otherRule = new ExternalResource() {
+                      @Override
+                      protected void before() {}
+                  };
+
+                  @Rule
+                  public RuleChain chain = RuleChain.outerRule(otherRule).around(tempFolder);
+              }
+              """
+          )
+        );
+    }
 }