Painless JavaScript Unit Testing
Companies using Jest
Why people like Jest
Add a one-liner



Jest provides you with multiple layers on top of Jasmine.

Jest's Features
  • Familiar Approach: Built on top of the Jasmine test framework, using familiar expect(value).toBe(other) assertions
  • Mock by Default: Automatically mocks CommonJS modules returned by require(), making most existing code testable
  • Short Feedback Loop: DOM APIs are mocked and tests run in parallel via a small node.js command line utility

Explore other Build, Test, Deploy tools that are known for: