chia7712 commented on code in PR #15862:
URL: https://github.com/apache/kafka/pull/15862#discussion_r1622894813


##########
core/src/test/java/kafka/test/junit/ClusterTestExtensionsUnitTest.java:
##########
@@ -17,29 +17,64 @@
 
 package kafka.test.junit;
 
+import kafka.test.ClusterConfig;
 import kafka.test.annotation.ClusterTemplate;
 
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.extension.ExtensionContext;
+
+import java.lang.reflect.Method;
+import java.util.Collections;
+import java.util.List;
+
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
 public class ClusterTestExtensionsUnitTest {
+
+    static List<ClusterConfig> cfgEmpty() {
+        return Collections.emptyList();
+    }
+
+    @SuppressWarnings({"unchecked", "rawtypes"})
+    private ExtensionContext buildExtensionContext(String methodName) throws 
Exception {
+        ExtensionContext extensionContext = mock(ExtensionContext.class);
+        Class clazz = ClusterTestExtensionsUnitTest.class;
+        Method method = clazz.getDeclaredMethod(methodName);
+        when(extensionContext.getRequiredTestClass()).thenReturn(clazz);
+        when(extensionContext.getRequiredTestMethod()).thenReturn(method);
+        return extensionContext;
+    }
+
     @Test
-    void testProcessClusterTemplate() {
+    void testProcessClusterTemplate() throws Exception {
         ClusterTestExtensions ext = new ClusterTestExtensions();
-        ExtensionContext context = mock(ExtensionContext.class);
+        ExtensionContext context = buildExtensionContext("cfgEmpty");
 
         ClusterTemplate annot = mock(ClusterTemplate.class);
-        when(annot.value()).thenReturn("").thenReturn(" ");
+        when(annot.value()).thenReturn("").thenReturn(" 
").thenReturn("cfgEmpty");
+
+        Assertions.assertEquals(

Review Comment:
   This test is equal to next one, right?



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