junrao commented on a change in pull request #8562:
URL: https://github.com/apache/kafka/pull/8562#discussion_r416760588



##########
File path: 
core/src/test/scala/unit/kafka/server/ReplicaAlterLogDirsThreadTest.scala
##########
@@ -243,9 +245,9 @@ class ReplicaAlterLogDirsThreadTest {
       responseCallback = callbackCaptor.capture(),
       isolationLevel = ArgumentMatchers.eq(IsolationLevel.READ_UNCOMMITTED),
       clientMetadata = ArgumentMatchers.eq(None)
-    )).thenAnswer(_ => {
-      callbackCaptor.getValue.apply(Seq((topicPartition, responseData)))
-    })
+    )) thenAnswer new Answer[Unit] {

Review comment:
       Should we keep the` .` before `thenAnswer` and use `[]`? The existing 
convention is the following.
   
   ```
         when(...)
         .thenAnswer(new Answer[Unit] {
             override def answer(invocation: InvocationOnMock): Unit = {
                ...
             }
           })
   ```




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