chia7712 commented on code in PR #15800:
URL: https://github.com/apache/kafka/pull/15800#discussion_r1586042610


##########
core/src/test/java/kafka/test/junit/ClusterTestExtensions.java:
##########
@@ -118,16 +118,15 @@ public Stream<TestTemplateInvocationContext> 
provideTestTemplateInvocationContex
         return generatedContexts.stream();
     }
 
-    private void processClusterTemplate(ExtensionContext context, 
ClusterTemplate annot,
+    void processClusterTemplate(ExtensionContext context, ClusterTemplate 
annot,
                                         
Consumer<TestTemplateInvocationContext> testInvocations) {
         // If specified, call cluster config generated method (must be static)
         List<ClusterConfig> generatedClusterConfigs = new ArrayList<>();
-        if (!annot.value().isEmpty()) {
-            generateClusterConfigurations(context, annot.value(), 
generatedClusterConfigs::add);
-        } else {
-            // Ensure we have at least one cluster config
-            
generatedClusterConfigs.add(ClusterConfig.defaultBuilder().build());
+
+        if (annot.value().isEmpty()) {

Review Comment:
   How about `if (annot.value().trim().isEmpty()) throw new 
IllegalStateException("ClusterTemplate value can't be empty string");`



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