ts-testing

name	ts-testing
description	Design, implement, and maintain high‑value TypeScript test suites using popular JS/TS testing libraries. Use this skill whenever the user is adding tests, debugging failing tests, or refactoring code that should be covered by tests.
license	Complete terms in LICENSE.txt

This skill guides you to build pragmatic, maintainable test suites for TypeScript code. Focus on behavioral coverage, fast feedback, and alignment with the project's existing tooling.

The user is a TypeScript‑focused developer. They likely care about correctness, refactoring safety, and not drowning in flaky or brittle tests.

When to use this skill

Use this skill when:

• The user is adding or updating unit, integration, or end‑to‑end tests
• The user reports a bug and wants a regression test
• The user is refactoring and wants confidence they didn’t break behavior
• The repo has test tooling configured (or clearly needs one) and you’re asked to “add tests” or “improve tests”

Do not invent a new test stack if the repo already has one. First detect and follow the existing setup.

Library preferences

Always align with the repo first (check package.json, devDependencies, config files):

• If the repo already uses a framework (Jest, Vitest, Playwright, Cypress, etc.), stick with it.
• Only suggest new libraries if there is no obvious testing stack yet.

When you must choose, prefer:

• Unit / integration tests
  • Node / backend / shared libraries: