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Daniel Pötzinger
2018-05-09 11:46:06 +02:00
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radar/2017-10-01/jest.md
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---
[Jest](https://facebook.github.io/jest/) is a javascript testing framework by facebook to test javascript code **and** react applications / components.
We started using Jest (and [watchmen](https://github.com/facebook/watchman)) instead of Karma because it:
- gives us integrated mocking library
- gives us integrated support for testing "promises"
- gives us integrated code coverage report
- automatically runs tests related to changed files (instead of all tests)
- gives us parallel test execution
- gives us snapshot testing for react components
It is easy to set up. And even if you have a running setup with karma/chai you can easily replace karma with jest. With a small [workaround](https://medium.com/@RubenOostinga/combining-chai-and-jest-matchers-d12d1ffd0303#.3callo273), chai and jest test matchers work fine together.