[PR] GH-50665: [Python] Assert s3fs selector result count [arrow]

["erichanwang (via GitHub)" <gi...@apache.org>]

erichanwang opened a new pull request, #50836:
URL: https://github.com/apache/arrow/pull/50836

   ### Rationale for this change
   
   The recursive selector branch for the fsspec S3 backend evaluated `len(infos) == 4` without asserting the result. As a result, an incorrect number of returned entries could pass the test unnoticed.
   
   ### What changes are included in this PR?
   
   - Assert that the recursive s3fs selector returns four entries.
   
   Fixes #50665.
   
   ### Are these changes tested?
   
   Yes. The modified test file passes Python syntax compilation, and `git diff --check` passes. The focused runtime test could not run locally because this checkout does not have the pyarrow test dependencies installed.
   
   ### Are there any user-facing changes?
   
   No. This change only strengthens an existing Python filesystem test.
   
   * GitHub Issue: #50665
   


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Re: [PR] GH-50665: [Python] Assert s3fs selector result count [arrow]

["erichanwang (via GitHub)" <gi...@apache.org>]

erichanwang closed pull request #50836: GH-50665: [Python] Assert s3fs selector result count
URL: https://github.com/apache/arrow/pull/50836


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