Claude Code
Codex
Cursor
GitHub Copilot
Gemini CLIAbout this skill
Write effective unit tests — Arrange-Act-Assert structure, test boundary selection, mocking strategy, test doubles (spy/stub/mock/fake), parameterized tests, snapshot pitfalls, test naming, and Vitest/Jest configuration. Use when asked about "unit test", "write tests", "Jest", "Vitest", "mock function", "spy on", "stub", "test coverage", "describe/it/expect", "beforeEach/afterEach", "parameterized test", "test.each", "snapshot test", "how to test this function", or "unit testing best practices". Do NOT use for: E2E browser testing — see e2e-testing. Do NOT use for: contract testing — see contract-testing. Do NOT use for: load testing — see load-testing.
Quick start
- Copy the install prompt. Use the green button above this README.
- Send it to your agent. Paste it into your coding agent’s chat and send.
- Review the setup. Your agent checks the skill’s instructions, requirements, and installation scope.
Review, license & listing details
This is an imported listing. We haven’t certified its safety, license, or compatibility. Skills may include executable scripts.
Only SKILL.md was scanned. Supporting files and scripts were not checked. No safety grade has been assigned.
0 potential findings · Scanned 11/4/2026 · Scanner 0.2.1
Content SHA-256: eb746405a66149eab1cb8f9dff313f1569268ab9305ab2747d8917931115fdd4
About this listing
- Category
- Engineering
- Reported license
- Not specified
- Listing language (estimated)
- English
- Review status
- Not individually reviewed
- Agent compatibility
- Atlas installation supports Claude Code, Codex, and Cursor. Skill-specific dependencies and features are checked during setup.