chia7712 commented on code in PR #15488:
URL: https://github.com/apache/kafka/pull/15488#discussion_r1516370592


##########
core/src/test/scala/unit/kafka/log/LogLoaderTest.scala:
##########
@@ -352,7 +353,10 @@ class LogLoaderTest {
       // Intercept all segment read calls
       val interceptedLogSegments = new LogSegments(topicPartition) {
         override def add(segment: LogSegment): LogSegment = {
-          val wrapper = new LogSegment(segment) {
+          val idx = 
LazyIndex.forOffset(LogFileUtils.offsetIndexFile(wrapperLogDir, 
segment.baseOffset()), segment.baseOffset(), 1000)

Review Comment:
   How about using `Mockito.spy`? for example:
   
   ```scala
             val wrapper = Mockito.spy(segment)
             Mockito.doAnswer{ in =>
               segmentsWithReads += wrapper
               segment.read(in.getArgument(0, classOf[java.lang.Long]), 
in.getArgument(1, classOf[java.lang.Integer]), in.getArgument(2, 
classOf[java.lang.Long]), in.getArgument(3, classOf[java.lang.Boolean]))
             }.when(wrapper).read(ArgumentMatchers.any(), 
ArgumentMatchers.any(), ArgumentMatchers.any(), ArgumentMatchers.any())
             Mockito.doAnswer{ in =>
               recoveredSegments += wrapper
               segment.recover(in.getArgument(0, 
classOf[ProducerStateManager]), in.getArgument(1, 
classOf[Optional[LeaderEpochFileCache]]))
             }.when(wrapper).recover(ArgumentMatchers.any(), 
ArgumentMatchers.any())
             super.add(wrapper)
   ```



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