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docs: add red-green TDD workflow guidance to Copilot instructions #362

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docs: add red-green TDD workflow guidance to Copilot instructions #362

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10 changes: 10 additions & 0 deletions .github/copilot-instructions.md
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Expand Up @@ -296,3 +296,13 @@ All AI-assisted work must be traceable through:
2. Jira custom field (`customfield_11170` = "Yes")
3. PR descriptions mentioning AI assistance
4. Commit messages where relevant

## Red-Green Test-Driven Development

When making code changes in this repository, follow a red-green TDD workflow:

1. **Red**: Write or update a test that captures the desired behavior or reproduces the bug. Run the test (locally or let CI run it) and confirm it **fails**.
2. **Green**: Write the minimal code change needed to make the failing test pass. Re-run the test (locally or in CI) and confirm it now **passes**.
3. **Refactor**: With the passing test as a safety net, clean up the implementation as needed, re-running tests to ensure they remain green.

Do not write the fix before the failing test exists. This ensures every change is backed by a test that would have caught the issue, and that the fix is verifiably correct.
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