Java + Universal Local Runner: custom WindowFn support seems incomplete
Open
core
harness
java
new feature
P3
runners
universal
- Dominant language
- Java
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Description
On https://github.com/apache/beam/pull/11792/ the following tests failed and were sickbayed:
```
excludeTestsMatching 'org.apache.beam.sdk.transforms.windowing.WindowTest.testMergingCustomWindows'
excludeTestsMatching 'org.apache.beam.sdk.transforms.windowing.WindowTest.testMergingCustomWindowsKeyedCollection'
excludeTestsMatching 'org.apache.beam.sdk.transforms.windowing.WindowingTest.testMergingWindowing'
excludeTestsMatching 'org.apache.beam.sdk.transforms.windowing.WindowingTest.testNonPartitioningWindowing'
```
Imported from Jira [BEAM-10448](https://issues.apache.org/jira/browse/BEAM-10448). Original Jira may contain additional context.
Reported by: kenn.
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