hachikuji commented on code in PR #13230:
URL: https://github.com/apache/kafka/pull/13230#discussion_r1103426128


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core/src/test/scala/unit/kafka/server/AbstractFetcherThreadTest.scala:
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@@ -1089,6 +1089,85 @@ class AbstractFetcherThreadTest {
     fetcher.verifyLastFetchedEpoch(partition, Some(5))
   }
 
+  @Test
+  def testTruncateOnFetchDoesNotUpdateHighWatermark(): Unit = {

Review Comment:
   nit: wonder if we should change the name. The test is not really doing 
anything with the high watermark; it is just verifying that 
`processPartitionData` is not called. Maybe a test like this could exist for 
`ReplicaFetcherThread`?



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