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I see articles using Chai, but should.js comes from TJ Holowaychuk, maker of Express and Mocha, which is an excellent pedigree. Should I use Chai or should.js with Mocha for a new Node.js server-side only project?
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Mocha is a JavaScript test framework running on Node. js and in the browser. Mocha allows asynchronous testing, test coverage reports, and use of any assertion library. Chai is a BDD / TDD assertion library for NodeJS and the browser that can be delightfully paired with any javascript testing framework.
Introduction to Unit Testing with Mocha and Chai Chai is an assertion library that is mostly used alongside Mocha. It can be used both as a BDD / TDD assertion library for NodeJS and can be paired with any JavaScript testing framework.
Jest is also faster than Mocha. It has built-in support for snapshot testing, which means tests are run automatically on each change to the code. This makes it easy to keep your tests up to date as you work. Mocha has more features out of the box since it is a more mature tool with a larger community of contributors.
In the end there are only few differences in the API. Generally I would tend to chai.js because:
However it does not make a big difference.
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