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Add 36 unit tests for cj/delete-buffer-and-file covering:
- Normal cases: VC vs non-VC file deletion, trash flag usage
- Boundary cases: file content variations, naming edge cases, buffer states
- Error cases: permission issues, VC failures, error propagation
Key testing decisions documented in Commentary:
- Mock delete-file errors for deterministic, portable tests
- Test our code's behavior (branching logic, error propagation), not the
underlying trash/filesystem implementations
- Verify correct calls to vc-delete-file vs delete-file with trash flag
All 36 tests passing.
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