Rishavbhattarai commented on PR #40865:
URL: https://github.com/apache/beam/pull/40865#issuecomment-6479836085

   Thanks both. I kept `ProcessFnTester` because these tests check state 
between steps. For example, they assert the watermark hold after each 
`advanceProcessingTimeBy` call and the outputs before and after a checkpoint. A 
`TestStream` pipeline only shows the final output, so those checks would be 
lost rather than moved.
   
   I'm happy to keep this PR as a straight swap and open a follow-up issue for 
covering the end-to-end behavior with `TestStream` in `SplittableDoFnTest`, if 
that works for you @shunping.
   


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