Tdd
Red-green-refactor discipline for writing new functionality. Use whenever adding new behavior, a new function, or a new feature that can be driven by a test — not just when the user says "TDD".From its SKILL.md
npx -y skills add bingelp/skills --skill tddAssembled from the repository path, not quoted from the project. Check it against their README if it does not work.
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SKILL.md
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TDD
Overview
Write the failing test before the code that makes it pass. Keeps scope honest and gives you a working definition of "done" for free.
When to Use
Any time you're about to add new behavior with a clear expected input/output — a new function, endpoint, component behavior, bug fix with a reproducible case.
Don't force it for: exploratory spikes, pure config/plumbing changes, or UI-only visual tweaks with nothing meaningful to assert on.
Process
- Red — write a test for the behavior that doesn't exist yet. Run it, confirm it fails for the expected reason (not a typo or import error).
- Green — write the minimum code to make it pass. Resist adding anything the test doesn't require.
- Refactor — clean up now that it's green, keeping the test passing. Don't skip this step just because green feels done.
- Repeat per behavior, not per file — small cycles.
Red Flags
- Writing the implementation first and backfilling a test — that's not TDD, note it explicitly if you do it out of necessity.
- A test that passes immediately without ever seeing it fail — you haven't verified it tests anything.
- Piling multiple behaviors into one red-green cycle — split them.
What ships with it
Read from the repository
Just SKILL.md. No reference files, no scripts.