jest-tests

Overview

Per jestjs.io/docs/getting-started:

Jest is "a delightful JavaScript Testing Framework with a focus on simplicity." It bundles expect assertions, snapshot testing, mocking (no separate Sinon needed), and code coverage in one tool. Works with TypeScript via babel-jest (faster) or ts-jest (full type-checking).

This skill targets per-framework lifecycle (configure / run / mock / coverage / CI) - NOT test code hygiene patterns. For hygiene (assertion quality / AAA structure / mocking anti-patterns), see test-code-conventions and the qa-test-review agents.