[PR] test: make mapWithResource abrupt cleanup tests deterministic [pekko]

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

He-Pin opened a new pull request, #3319:
URL: https://github.com/apache/pekko/pull/3319

   ### Motivation
   
   The abrupt materializer termination tests used Source.single. Since mapWithResource runs on the blocking I/O dispatcher, its async boundary can let Source.single complete and close the resource before materializer shutdown. The test can therefore observe normal upstream completion instead of the abrupt termination path.
   
   ### Modification
   
   Use Source.maybe in both abrupt termination variants so the upstream remains open. After resource creation, assert that cleanup has not run before shutting down the materializer.
   
   ### Result
   
   The tests now isolate abrupt termination from normal upstream completion and retain directional assertions that cleanup runs after shutdown, including exactly-once closure for AutoCloseable resources.
   
   ### Verification
   
   - FlowMapWithResourceSpec passed on Scala 2.13 and Scala 3.
   - validatePullRequest passed with 3,392 tests and no failures or errors.
   - Header and code-style checks passed.
   
   ### References
   
   Fixes #3310


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Re: [PR] test: make mapWithResource abrupt cleanup tests deterministic [pekko]

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

He-Pin merged PR #3319:
URL: https://github.com/apache/pekko/pull/3319


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