Github user tzulitai commented on the issue:

    https://github.com/apache/flink/pull/3278
  
    Instead of directly re-adding 
`testAtLeastOnceProducerFailsIfFlushingDisabled `, I instead added a test 
`testDoesNotWaitForPendingRecordsIfFlushingDisabled` to simply assure that the 
snapshot method returns even if there are pending records.
    
    The purpose of the `testDoesNotWaitForPendingRecordsIfFlushingDisabled` 
test is to assure that the actual `testAtLeastOnceProducer` test is valid.
    I think this was what the original 
`testAtLeastOnceProducerFailsIfFlushingDisabled` was actually meant for anyway.
    
    @tillrohrmann please let me know if this makes sense to you :-)


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