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testing-tdd

Guides agents through Red-Green-Refactor with runner-captured evidence. Use when running /cc-tdd-cycle, writing tests before implementation, or Global TDD required is yes.

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Test-Driven Development

Overview

Red (failing test) → Green (minimal code) → Refactor. Evidence comes from npx cc-codeconductor tdd capture, not handmade JSON.

When to Use

  • /cc-tdd-cycle, new behavior, bug fixes, TDD-required OpenSpec items

NOT for docs-only changes or when the Task Card forbids tests.

Process

  1. Write the failing test that encodes one acceptance criterion. Run the suite. It MUST fail (suiteFails === true).
  2. Implement the minimum that turns it green. Do not expand scope.
  3. Refactor only with a green suite.
  4. Capture evidence via the verification runner (openspec done on test/implement when TDD is required).
  5. Cover happy path, edge, and error for each behavior.

Pyramid default: many unit, fewer integration, rare E2E.

Common Rationalizations

RationalizationReality
I'll add tests laterLater means never. Red first.
This is too small to testIf it can break, it needs a failing test first.
I'll write the evidence JSONHandmade TDD JSON is rejected.

Red Flags

  • Tests that assert implementation details instead of behavior
  • Green without a recorded red
  • Skipping error cases

Verification

  • Suite failed before implement
  • Suite passed after implement
  • Runner evidence exists (not handmade)
  • Optional: npx cc-codeconductor scorecard suite-run --suite workflow-gates

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