What is Jest?
What is Mocha?
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I'm using Jest for 3 months in a Vue JS project . I need to use a lot of custom search of related topics in jest docs because it's not clear. The examples are very poor too.
Jest is my unit-testing tool of choice.
Almost all unit testing suites (Mocha, Jasmine, etc.) are more or less the same.
The main advantage I guess, is that it integrates pretty well with React and Enzyme.
Used for unit testing when working with Node.js. Used over other testing frameworks because of good compatibility with TypeScript and ts-node.