[FLINK-12334] change to MockStreamTask breaks OneInputStreamOperatorTestHarness

• Type: Bug
• Status: Open
• Priority: Not a Priority
• Resolution: Unresolved
• Affects Version/s: 1.8.0
• Component/s: API / DataStream
• Labels: auto-deprioritized-major auto-deprioritized-minor
• Assignee: Unassigned
• Reporter: Cliff Resnick
• Created: 25/Apr/19 21:31
• Updated: 25/Nov/21 22:38

Description

The move to the MockStreamTask is created with does not include initialization of an Accumulator Map when using the builder

https://github.com/apache/flink/blob/e43d55445e7abcadb92460bb4d61e28540f1189d/flink-streaming-java/src/test/java/org/apache/flink/streaming/util/AbstractStreamOperatorTestHarness.java#L198

This results in with a TestHarness whose context contains an immutable empty map and is breaking tests. The fix is simple, please include an actual map in the builder call.