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Chai vs Mocha: What are the differences?
Chai: A BDD / TDD assertion library. It is a BDD / TDD assertion library for node and the browser that can be delightfully paired with any javascript testing framework. It has several interfaces that allow the developer to choose the most comfortable. The chain-capable BDD styles provide an expressive language & readable style, while the TDD assert style provides a more classical feel; Mocha: Simple, flexible, fun javascript test framework for node.js & the browser. Mocha is a feature-rich JavaScript test framework running on node.js and the browser, making asynchronous testing simple and fun. Mocha tests run serially, allowing for flexible and accurate reporting, while mapping uncaught exceptions to the correct test cases.
Chai and Mocha can be categorized as "Javascript Testing Framework" tools.
Chai and Mocha are both open source tools. It seems that Mocha with 18.1K GitHub stars and 2.44K forks on GitHub has more adoption than Chai with 6.39K GitHub stars and 575 GitHub forks.
Coursera, Asana, and Typeform are some of the popular companies that use Mocha, whereas Chai is used by BeatSense, Brainhub, and Clovis. Mocha has a broader approval, being mentioned in 400 company stacks & 272 developers stacks; compared to Chai, which is listed in 6 company stacks and 8 developer stacks.
We use Mocha for our FDA verification testing. It's integrated into Meteor, our upstream web application framework. We like how battle tested it is, its' syntax, its' options of reporters, and countless other features. Most everybody can agree on mocha, and that gets us half-way through our FDA verification and validation (V&V) testing strategy.
Pros of Chai
Pros of Mocha
- Open source137
- Simple102
- Promise support81
- Flexible48
- Easy to add support for Generators29
- For browser and server testing12
- Curstom assertion libraries7
- Works with Karma5
- No other better tools3
- Simple setup1
- Works with saucelabs1
- Lots of tutorials and help online1
- Default reporter is nice, clean, and itemized1
- Works with BrowserStack1
- Simple integration testing1
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Cons of Chai
Cons of Mocha
- Cannot test a promisified functions without assertion3
- No assertion count in results2
- Not as many reporter options as Jest1
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What is Chai?
What is Mocha?
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What companies use Chai?
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What tools integrate with Chai?
What tools integrate with Mocha?
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