chia7712 commented on code in PR #15916:
URL: https://github.com/apache/kafka/pull/15916#discussion_r1605371498


##########
core/src/test/java/kafka/test/ClusterTestExtensionsTest.java:
##########
@@ -62,10 +63,10 @@ public class ClusterTestExtensionsTest {
     }
 
     // Static methods can generate cluster configurations
-    static void generate1(ClusterGenerator clusterGenerator) {
+    static List<ClusterConfig> generate1() {
         Map<String, String> serverProperties = new HashMap<>();
         serverProperties.put("foo", "bar");
-        clusterGenerator.accept(ClusterConfig.defaultBuilder()
+        return Arrays.asList(ClusterConfig.defaultBuilder()

Review Comment:
   `Collections.singletonList`



##########
core/src/test/java/kafka/test/junit/ClusterTestExtensions.java:
##########
@@ -122,31 +115,57 @@ public Stream<TestTemplateInvocationContext> 
provideTestTemplateInvocationContex
         return generatedContexts.stream();
     }
 
-    void processClusterTemplate(ExtensionContext context, ClusterTemplate 
annot,
-                                        
Consumer<TestTemplateInvocationContext> testInvocations) {
+
+
+    List<TestTemplateInvocationContext> 
processClusterTemplate(ExtensionContext context, ClusterTemplate annot) {
         // If specified, call cluster config generated method (must be static)
         List<ClusterConfig> generatedClusterConfigs = new ArrayList<>();

Review Comment:
   Please remove this unused variable



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