Github user NicoK commented on a diff in the pull request: https://github.com/apache/flink/pull/5105#discussion_r156425243 --- Diff: flink-runtime/src/test/java/org/apache/flink/runtime/io/network/api/writer/RecordWriterTest.java --- @@ -118,7 +122,7 @@ public Buffer answer(InvocationOnMock invocation) throws Throwable { }; BufferProvider bufferProvider = mock(BufferProvider.class); - when(bufferProvider.requestBufferBlocking()).thenAnswer(request); + when(bufferProvider.requestBufferBuilderBlocking()).thenAnswer(request); --- End diff -- Wouldn't it be enough to have a `TestPooledBufferProvider` with an appropriate recycler and just one buffer to create the same behaviour but without a mock?
---