[PR] test: select the active FileSource actor in dispatcher checks [pekko]

["He-Pin (via GitHub)" <gi...@apache.org>]

He-Pin opened a new pull request, #3002:
URL: https://github.com/apache/pekko/pull/3002

   ### Motivation
   FileSourceSpec dispatcher checks can select a stale fileSource child left briefly by a previous materialization, which makes the dispatcher override assertion flaky.
   
   ### Modification
   Capture existing fileSource children before starting each dispatcher-check stream, wait for exactly the newly materialized child, and watch it terminate after cancellation.
   
   ### Result
   The checks assert the dispatcher of the stream started by the current test instead of a leftover child from an earlier materialization.
   
   ### Tests
   - JDK 17 Scala 3.3.6: stream-tests / Test / testOnly org.apache.pekko.stream.io.FileSourceSpec
   - scalafmt --mode diff-ref=origin/main --quiet
   - scalafmt --list --mode diff-ref=origin/main
   - git diff --check
   
   ### References
   Refs #2994


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Re: [PR] test: select the active FileSource actor in dispatcher checks [pekko]

["He-Pin (via GitHub)" <gi...@apache.org>]

He-Pin merged PR #3002:
URL: https://github.com/apache/pekko/pull/3002


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