Enhanced test coverage to match production code regex pattern and prevent
false positives by adding comprehensive edge case testing.
**Changes:**
1. **Updated regex pattern to match production code**:
- Changed from `/([0-9a-f]{40})\s*\t/` to `/\b([0-9a-fA-F]{40})(?=\s*\t)/`
- Now handles both uppercase and lowercase hex characters (A-F and a-f)
- Uses word boundary `\b` for more precise matching
- Uses lookahead `(?=\s*\t)` instead of capturing whitespace
2. **Added uppercase SHA test**:
- Tests extraction of uppercase commit SHA (196D3DF7...)
- Normalizes to lowercase using `strtolower()` for comparison
- Reflects Git's case-insensitive SHA handling
3. **Added negative test cases**:
- Tests output with no commit SHA present (error messages only)
- Tests output with tab but invalid SHA format
- Ensures `null` is returned to prevent false positives
**Test Coverage:**
- 8 total tests (up from 5)
- Covers all positive cases (lowercase, uppercase, warnings, whitespace)
- Covers negative cases (missing SHA, invalid format)
- Regex pattern now exactly matches production code in ApplicationDeploymentJob.php:1908
Co-Authored-By: Claude <noreply@anthropic.com>
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