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Adds GitHub Copilot VS Code instruction and prompt files for ECC workflows, with VS Code prompt frontmatter/settings aligned to current docs and tests covering the surface. Co-authored-by: Girish Kanjiyani <girish.kanjiyani5040@gmail.com> Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
48 lines
1.5 KiB
Markdown
48 lines
1.5 KiB
Markdown
---
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agent: agent
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description: Test-driven development cycle — write the test first, then implement
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---
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# TDD Workflow
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Follow the RED → GREEN → IMPROVE cycle strictly. Do not write implementation code before a failing test exists.
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## Cycle
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### 1. RED — Write the failing test
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- Write a test that describes the desired behavior.
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- Run it. It **must fail** before continuing.
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- Use Arrange-Act-Assert structure.
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- Name tests descriptively: `returns empty array when no items match filter`, not `test itemFilter`.
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### 2. GREEN — Minimal implementation
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- Write the **minimum** code needed to make the test pass.
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- Do not over-engineer at this stage.
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- Run the test again — it **must pass**.
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### 3. IMPROVE — Refactor
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- Clean up duplication, naming, structure.
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- Keep all tests passing after each change.
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- Check coverage: target **≥ 80%**.
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## Test Layer Checklist
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- [ ] **Unit** — pure functions, utilities, isolated components
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- [ ] **Integration** — API endpoints, database operations, service boundaries
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- [ ] **E2E** — at least one critical user flow covered
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## Quality Gates
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Before marking the feature done:
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- [ ] All tests pass
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- [ ] Coverage ≥ 80%
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- [ ] No skipped/commented-out tests
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- [ ] Edge cases covered: empty input, nulls, boundary values, error paths
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## Anti-patterns to Avoid
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- Writing implementation before tests
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- Testing implementation details instead of behavior
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- Mocking too deeply (prefer integration tests over excessive mocks)
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- Assertions that always pass (`expect(true).toBe(true)`)
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