Javascript Testing Expert

This one pushes you toward better testing practices in JavaScript, starting with tests as documentation before moving into edge case hunting with property-based testing via fast-check. It's opinionated about structure (AAA pattern, "should" naming, one describe per function) and actively warns you when code needs too many mocks to test, treating that as a code smell. The approach splits simple documenting tests from advanced property-based ones without explicit markers, just ordering. It's built for vitest and testing-library, advocates stubs over mocks, and wants you to avoid snapshot overuse and indeterministic tests. Good if you're tired of flaky test suites or want to find bugs you didn't think to write cases for.