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Chai

3.9K
195
+ 1
0
Jest

9.7K
4K
+ 1
175
Mocha

8.7K
2.9K
+ 1
430
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Pros of Chai
Pros of Jest
Pros of Mocha
    Be the first to leave a pro
    • 36
      Open source
    • 32
      Mock by default makes testing much simpler
    • 23
      Testing React Native Apps
    • 20
      Parallel test running
    • 16
      Fast
    • 13
      Bundled with JSDOM to enable DOM testing
    • 8
      Mock by default screws up your classes, breaking tests
    • 7
      Out of the box code coverage
    • 7
      Promise support
    • 6
      One stop shop for unit testing
    • 3
      Great documentation
    • 2
      Assert Library Included
    • 1
      Built in watch option with interactive filtering menu
    • 1
      Preset support
    • 0
      Can be used for BDD
    • 0
      Karma
    • 137
      Open source
    • 102
      Simple
    • 81
      Promise support
    • 48
      Flexible
    • 29
      Easy to add support for Generators
    • 12
      For browser and server testing
    • 7
      Curstom assertion libraries
    • 5
      Works with Karma
    • 3
      No other better tools
    • 1
      Simple setup
    • 1
      Works with saucelabs
    • 1
      Lots of tutorials and help online
    • 1
      Default reporter is nice, clean, and itemized
    • 1
      Works with BrowserStack
    • 1
      Simple integration testing

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    Cons of Chai
    Cons of Jest
    Cons of Mocha
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      • 4
        Documentation
      • 4
        Ambiguous configuration
      • 3
        Difficult
      • 2
        Many bugs still not fixed months/years after reporting
      • 2
        Multiple error messages for same error
      • 2
        Difficult to run single test/describe/file
      • 2
        Ambiguous
      • 2
        Bugged
      • 1
        BeforeAll timing out makes all passing tests fail
      • 1
        Slow
      • 1
        Reporter is too general
      • 1
        Unstable
      • 1
        Bad docs
      • 1
        Still does't support .mjs files natively
      • 1
        Can't fail beforeAll to abort tests
      • 0
        Interaction with watch mode on terminal
      • 3
        Cannot test a promisified functions without assertion
      • 2
        No assertion count in results
      • 1
        Not as many reporter options as Jest

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      What is Chai?

      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.

      What is Jest?

      Jest provides you with multiple layers on top of Jasmine.

      What is Mocha?

      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.

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      What tools integrate with Chai?
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      What are some alternatives to Chai, Jest, and Mocha?
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