Rancho-7 commented on code in PR #19966:
URL: https://github.com/apache/kafka/pull/19966#discussion_r2147947430


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core/src/test/scala/unit/kafka/server/ReplicaManagerTest.scala:
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@@ -2833,6 +2592,7 @@ class ReplicaManagerTest {
     allLogs.put(topicPartitionObj, mockLog)
     when(mockLogMgr.allLogs).thenReturn(allLogs.values.asScala)
     when(mockLogMgr.isLogDirOnline(anyString)).thenReturn(true)
+    when(mockLogMgr.directoryId(anyString)).thenReturn(None)

Review Comment:
   in the test `testFollowerFetchWithDefaultSelectorNoForcedHwPropagation`,we 
use `prepareReplicaManagerAndLogManager` to mock the replicaManager instead of 
`setupReplicaManagerWithMockedPurgatories`. Without this change, it results in 
a NPE at 
https://github.com/apache/kafka/blob/081deaa1a96710f2d58e094cf92ba92478c6dcba/core/src/main/scala/kafka/server/ReplicaManager.scala#L2942
 



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