Martijn Visser created FLINK-41187:
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             Summary: Remove StreamSource from StreamTask tests that guard 
surviving behaviour
                 Key: FLINK-41187
                 URL: https://issues.apache.org/jira/browse/FLINK-41187
             Project: Flink
          Issue Type: Sub-task
          Components: Test Infrastructure
            Reporter: Martijn Visser


The state-backend tests and testEarlyCanceling in StreamTaskTest only need a 
plain
AbstractStreamOperator; testTaskAvoidHangingAfterSnapshotStateThrownException 
becomes a
SourceOperatorStreamTask with a reader whose snapshotState throws. 
StreamTaskSystemExitTest
references StreamTaskTest.TestStreamSource in a signature. 
AbstractUdfStreamOperatorLifecycleTest
moves to a OneInputStreamTask with a tracking StreamMap (only its UDF::cancel 
case is legacy). The
two WaitingForFinalCheckpointOnSourceTask tests in 
StreamTaskFinalCheckpointsTest guard
FLINK-24161 and rerun on SourceOperatorStreamTask with a bounded MockSource.



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