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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