TDD — Test-Driven Development

Test-driven development. Use when the user wants to build features or fix bugs test-first, mentions "red-green-refactor", or wants integration tests.

This skill is imported from mattpocock/skills (MIT) and is model-invoked upstream.

When to use this skill

• Test-driven development.
• Use when the user wants to build features or fix bugs test-first, mentions "red-green-refactor", or wants integration tests.

Instructions

Test-Driven Development

TDD is the red → green loop. This skill is the reference that makes that loop produce tests worth keeping: what a good test is, where tests go, the anti-patterns, and the rules of the loop. Every section applies on every cycle: consult them before and during the loop, not after.

When exploring the codebase, read CONTEXT.md (if it exists) so test names and interface vocabulary match the project's domain language, and respect ADRs in the area you're touching.