Yunyung commented on code in PR #20014:
URL: https://github.com/apache/kafka/pull/20014#discussion_r2161736851


##########
core/src/test/scala/unit/kafka/server/ReplicaManagerTest.scala:
##########
@@ -1251,52 +1222,45 @@ class ReplicaManagerTest {
    */
   private def 
verifyBecomeFollowerWhenLeaderIsUnchangedButMissedLeaderUpdate(extraProps: 
Properties,
                                                                              
expectTruncation: Boolean): Unit = {
-    val topicPartition = 0
     val followerBrokerId = 0
     val leaderBrokerId = 1
-    val controllerId = 0
-    val controllerEpoch = 0
     var leaderEpoch = 1
     val leaderEpochIncrement = 2
-    val aliveBrokerIds = Seq[Integer](followerBrokerId, leaderBrokerId)
     val countDownLatch = new CountDownLatch(1)
     val offsetFromLeader = 5
-
     // Prepare the mocked components for the test
     val (replicaManager, mockLogMgr) = prepareReplicaManagerAndLogManager(new 
MockTimer(time),
-      topicPartition, leaderEpoch + leaderEpochIncrement, followerBrokerId, 
leaderBrokerId, countDownLatch,
+      0, leaderEpoch + leaderEpochIncrement, followerBrokerId, leaderBrokerId, 
countDownLatch,
       expectTruncation = expectTruncation, localLogOffset = Optional.of(10), 
offsetFromLeader = offsetFromLeader, extraProps = extraProps, topicId = 
Optional.of(topicId))
 
     try {
       // Initialize partition state to follower, with leader = 1, leaderEpoch 
= 1
-      val tp = new TopicPartition(topic, topicPartition)
-      val partition = replicaManager.createPartition(tp)
-      val offsetCheckpoints = new 
LazyOffsetCheckpoints(replicaManager.highWatermarkCheckpoints.asJava)
-      partition.createLogIfNotExists(isNew = false, isFutureReplica = false, 
offsetCheckpoints, None)
-      partition.makeFollower(
-        leaderAndIsrPartitionState(tp, leaderEpoch, leaderBrokerId, 
aliveBrokerIds),
-        offsetCheckpoints,
-        None)
+      val directoryIds = replicaManager.logManager.directoryIdsSet.toList
+      val initialFollowerDelta = topicsCreateDelta( startId = 
followerBrokerId, isStartIdLeader = false, partitions = List(0), directoryIds = 
directoryIds, topic, topicIds(topic), leaderEpoch)
+      val initialImage = imageFromTopics(initialFollowerDelta.apply())

Review Comment:
   This should fix the test. You can update based on this.
   ```suggestion
         val tp = new TopicPartition(topic, topicPartition)
         val partition = replicaManager.createPartition(tp)
         val offsetCheckpoints = new 
LazyOffsetCheckpoints(replicaManager.highWatermarkCheckpoints.asJava)
         partition.createLogIfNotExists(isNew = false, isFutureReplica = false, 
offsetCheckpoints, None)
   
         val initialFollowerDelta = topicsCreateDelta(startId = 
followerBrokerId, isStartIdLeader = false, partitions = List(0), List.empty, 
topic, topicIds(topic), leaderEpoch)
         val initialImage = imageFromTopics(initialFollowerDelta.apply())
         replicaManager.applyDelta(initialFollowerDelta, initialImage)
   ```



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