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JEST

Competitor of Karma but faster, parallel enabled, and not requiring browser to execute unit tests.

· fullstack

Jest is a delightful JavaScript Testing Framework with a focus on simplicity. It works with projects using: Babel, TypeScript, Node, React, Angular, Vue and more!

It is maintained by Facebook.

It aims to work out of the box and config free.

Features:

FAST AND SAFE

―run tests in parallel

―re-organizes runs based on how long test files take

CODE COVERAGE

―No additional setup needed

EASY MOCKING

―Mock any object outside of your test’s scope

GREAT EXCEPTIONS

―Jest provides rich context of test failure

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