chia7712 commented on code in PR #15946:
URL: https://github.com/apache/kafka/pull/15946#discussion_r1602875475


##########
core/src/test/java/kafka/test/junit/RaftClusterInvocationContext.java:
##########
@@ -284,24 +259,59 @@ public void startBroker(int brokerId) {
         @Override
         public void waitForReadyBrokers() throws InterruptedException {
             try {
-                clusterReference.get().waitForReadyBrokers();
+                clusterTestKit.waitForReadyBrokers();
             } catch (ExecutionException e) {
                 throw new AssertionError("Failed while waiting for brokers to 
become ready", e);
             }
         }
 
-        private BrokerServer findBrokerOrThrow(int brokerId) {
-            return 
Optional.ofNullable(clusterReference.get().brokers().get(brokerId))
-                .orElseThrow(() -> new IllegalArgumentException("Unknown 
brokerId " + brokerId));
-        }
-
         public Stream<BrokerServer> brokers() {
-            return clusterReference.get().brokers().values().stream();
+            return clusterTestKit.brokers().values().stream();
         }
 
         public Stream<ControllerServer> controllers() {
-            return clusterReference.get().controllers().values().stream();
+            return clusterTestKit.controllers().values().stream();
+        }
+
+        public void format() throws Exception {
+            safeBuildCluster();
+            this.clusterTestKit.format();
         }
 
+        private BrokerServer findBrokerOrThrow(int brokerId) {
+            return Optional.ofNullable(clusterTestKit.brokers().get(brokerId))
+                    .orElseThrow(() -> new IllegalArgumentException("Unknown 
brokerId " + brokerId));
+        }
+
+        private void safeBuildCluster() throws Exception {
+            if (this.clusterTestKit != null) {
+                return;
+            }
+            synchronized (this) {

Review Comment:
   I don't think we need to sync, as it won't be called concurrent.



##########
core/src/test/java/kafka/test/junit/RaftClusterInvocationContext.java:
##########
@@ -284,24 +259,59 @@ public void startBroker(int brokerId) {
         @Override
         public void waitForReadyBrokers() throws InterruptedException {
             try {
-                clusterReference.get().waitForReadyBrokers();
+                clusterTestKit.waitForReadyBrokers();
             } catch (ExecutionException e) {
                 throw new AssertionError("Failed while waiting for brokers to 
become ready", e);
             }
         }
 
-        private BrokerServer findBrokerOrThrow(int brokerId) {
-            return 
Optional.ofNullable(clusterReference.get().brokers().get(brokerId))
-                .orElseThrow(() -> new IllegalArgumentException("Unknown 
brokerId " + brokerId));
-        }
-
         public Stream<BrokerServer> brokers() {
-            return clusterReference.get().brokers().values().stream();
+            return clusterTestKit.brokers().values().stream();
         }
 
         public Stream<ControllerServer> controllers() {
-            return clusterReference.get().controllers().values().stream();
+            return clusterTestKit.controllers().values().stream();
+        }
+
+        public void format() throws Exception {

Review Comment:
   This method is not idempotent, so user can re-format it if they call 
`format` and then `start`



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