chia7712 commented on code in PR #15800:
URL: https://github.com/apache/kafka/pull/15800#discussion_r1582294569


##########
core/src/test/java/kafka/test/junit/ClusterTestExtensions.java:
##########
@@ -91,9 +91,6 @@ public Stream<TestTemplateInvocationContext> 
provideTestTemplateInvocationContex
         ClusterTemplate clusterTemplateAnnot = 
context.getRequiredTestMethod().getDeclaredAnnotation(ClusterTemplate.class);
         if (clusterTemplateAnnot != null) {
             processClusterTemplate(context, clusterTemplateAnnot, 
generatedContexts::add);
-            if (generatedContexts.isEmpty()) {
-                throw new IllegalStateException("ClusterConfig generator 
method should provide at least one config");

Review Comment:
   My previous comment is wrong. This check is used to make sure there is at 
least one `ClusterConfig`, so we should not remove it. However, It seems to me 
this check should be moved to `processClusterTemplate` and we should add unit 
test for it.



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