chia7712 commented on code in PR #15917:
URL: https://github.com/apache/kafka/pull/15917#discussion_r1598307218


##########
core/src/test/java/kafka/test/ClusterInstance.java:
##########
@@ -160,4 +167,34 @@ default Set<GroupProtocol> supportedGroupProtocols() {
 
         return Collections.unmodifiableSet(supportedGroupProtocols);
     }
+
+    //---------------------------[modify]---------------------------//
+
+    void start();
+
+    void stop();
+
+    void shutdownBroker(int brokerId);
+
+    void startBroker(int brokerId);
+
+    //---------------------------[wait]---------------------------//
+
+    void waitForReadyBrokers() throws InterruptedException;
+
+    default void waitForTopic(String topic, int partitions) throws 
InterruptedException {

Review Comment:
   @showuon I add a helper to make all `ClusterInstance` users :)



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