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Jest is a unit testing framework to write test cases for JavaScript and React codes. Jest was created by Facebook.
The command create-react-app installs Jest and its set of dependencies, so we don’t have to worry about that.
Read more about testing React with Jest at : https://betterprogramming.pub/write-test-cases-for-react-components-using-jest-and-enzyme-de3ac3d600c
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