[PR] Improve coverage for qumat/qdp.py by testing stub fallback behavior [mahout]

["alisha-1000 (via GitHub)" <gi...@apache.org>]

alisha-1000 opened a new pull request, #1081:
URL: https://github.com/apache/mahout/pull/1081

   ### Related Issues
   
   N/A
   
   ### Changes
   
   - [ ] Bug fix
   - [ ] New feature
   - [ ] Refactoring
   - [ ] Documentation
   - [x] Test
   - [ ] CI/CD pipeline
   - [ ] Other
   
   ### Why
   
   `qumat/qdp.py` provides a fallback stub implementation when the native `_qdp`
   extension is not available. This behavior is important for environments
   without GPU/native builds, but it was not explicitly covered by tests.
   
   Adding dedicated tests ensures that the fallback mechanism works as expected
   and remains stable over time.
   
   ### How
   
   - Added `testing/qumat/test_qdp_stub.py`
   - Forced a fresh import of `qumat.qdp` to trigger the fallback code path
   - Verified that:
     - An `ImportWarning` is emitted when `_qdp` is unavailable
     - Stub classes (`QdpEngine`, `QuantumTensor`) raise `ImportError` on instantiation
     - `__all__` exports are correctly defined
   
   All existing tests pass locally:
   
   - 561 passed
   - 91 skipped
   - Total coverage: 93% (442 statements, 32 missed)
   
   This change improves coverage for `qumat/qdp.py` without modifying runtime behavior or affecting the native extension logic.
   
   ## Checklist
   
   - [x] Added or updated unit tests for all changes
   - [ ] Added or updated documentation for all changes


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Re: [PR] Improve coverage for qumat/qdp.py by testing stub fallback behavior [mahout]

["alisha-1000 (via GitHub)" <gi...@apache.org>]

alisha-1000 closed pull request #1081: Improve coverage for qumat/qdp.py by testing stub fallback behavior
URL: https://github.com/apache/mahout/pull/1081


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Re: [PR] Improve coverage for qumat/qdp.py by testing stub fallback behavior [mahout]

["alisha-1000 (via GitHub)" <gi...@apache.org>]

alisha-1000 commented on PR #1081:
URL: https://github.com/apache/mahout/pull/1081#issuecomment-3943862526

   Superseded by #1084, which contains a more complete and refined coverage update for `qumat/qdp.py`. 
   
   Closing this PR to avoid duplication and keep the history clean.


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