testing-jest

Testing with Jest

Use eslint-plugin-jest to enforce testing style
Use testing-library/jest-dom and jest-community/jest-extended for supplemental expectation matchers
Use React Testing Library for testing React components
Use React Hooks Testing Library for testing React Hooks
Use User Event for simulating DOM events on React components under test
Use Fishery for building factories
Prefer placing test suite files alongside source files (e.g. Thing.tsx / Thing.test.tsx)
Prefer writing specific unit tests over Snapshot Testing
Prefer describe and it blocks over test blocks
Prefer .resolves/.rejects over awaiting promises in tests