jeffkbkim commented on code in PR #14985:
URL: https://github.com/apache/kafka/pull/14985#discussion_r1433029392


##########
core/src/test/scala/unit/kafka/coordinator/group/CoordinatorLoaderImplTest.scala:
##########
@@ -511,4 +544,35 @@ class CoordinatorLoaderImplTest {
 
     new FetchDataInfo(new LogOffsetMetadata(startOffset), fileRecords)
   }
+
+  private def logReadResult(
+    startOffset: Long,
+    producerId: Long,
+    producerEpoch: Short,
+    controlRecordType: ControlRecordType
+  ): FetchDataInfo = {
+    val fileRecords = mock(classOf[FileRecords])
+    val memoryRecords = MemoryRecords.withEndTransactionMarker(
+      startOffset,
+      0L,
+      RecordBatch.NO_PARTITION_LEADER_EPOCH,
+      producerId,
+      producerEpoch,
+      new EndTransactionMarker(controlRecordType, 0)
+    )
+
+    when(fileRecords.sizeInBytes).thenReturn(memoryRecords.sizeInBytes)
+
+    val bufferCapture: ArgumentCaptor[ByteBuffer] = 
ArgumentCaptor.forClass(classOf[ByteBuffer])
+    when(fileRecords.readInto(
+      bufferCapture.capture(),
+      ArgumentMatchers.anyInt())
+    ).thenAnswer { _ =>
+      val buffer = bufferCapture.getValue
+      buffer.put(memoryRecords.buffer.duplicate)
+      buffer.flip()
+    }
+
+    new FetchDataInfo(new LogOffsetMetadata(startOffset), fileRecords)

Review Comment:
   aren't we reading from the log in 
https://github.com/apache/kafka/pull/14985/files#diff-64992589f1b20d6db189de7b1e613d222be46fb2999cdc9790f8c27c380f3092R114-R115
 as well?



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