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Karma

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Mocha

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+ 1
425
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Karma vs Mocha: What are the differences?

Developers describe Karma as "Spectacular Test Runner for JavaScript". Karma is not a testing framework, nor an assertion library. Karma just launches a HTTP server, and generates the test runner HTML file you probably already know from your favourite testing framework. So for testing purposes you can use pretty much anything you like. On the other hand, Mocha is detailed as "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.

Karma belongs to "Browser Testing" category of the tech stack, while Mocha can be primarily classified under "Javascript Testing Framework".

Some of the features offered by Karma are:

  • Test on Real Devices
  • Remote Control
  • Testing Framework Agnostic

On the other hand, Mocha provides the following key features:

  • browser support
  • simple async support, including promises
  • test coverage reporting

"Test Runner" is the top reason why over 56 developers like Karma, while over 130 developers mention "Open source" as the leading cause for choosing Mocha.

Karma and Mocha are both open source tools. It seems that Mocha with 18K GitHub stars and 2.43K forks on GitHub has more adoption than Karma with 10.7K GitHub stars and 1.61K GitHub forks.

According to the StackShare community, Mocha has a broader approval, being mentioned in 397 company stacks & 268 developers stacks; compared to Karma, which is listed in 119 company stacks and 57 developer stacks.

Decisions about Karma and Mocha

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.

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Pros of Karma
Pros of Mocha
  • 60
    Test Runner
  • 34
    Open source
  • 27
    Continuous Integration
  • 22
    Great for running tests
  • 18
    Test on Real Devices
  • 11
    Backed by google
  • 5
    Easy Debugging
  • 2
    Remote Control
  • 136
    Open source
  • 100
    Simple
  • 81
    Promise support
  • 48
    Flexible
  • 28
    Easy to add support for Generators
  • 12
    For browser and server testing
  • 7
    Curstom assertion libraries
  • 4
    Works with Karma
  • 3
    No other better tools
  • 1
    Simple integration testing
  • 1
    Default reporter is nice, clean, and itemized
  • 1
    Simple setup
  • 1
    Works with saucelabs
  • 1
    Lots of tutorials and help online
  • 1
    Works with BrowserStack

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Cons of Karma
Cons of Mocha
  • 1
    Slow, because tests are run in a real browser
  • 1
    Requires the use of hacks to find tests dynamically
  • 3
    Cannot test a promisified functions without assertion
  • 1
    No assertion count in results
  • 1
    Not as many reporter options as Jest

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What is Karma?

Karma is not a testing framework, nor an assertion library. Karma just launches a HTTP server, and generates the test runner HTML file you probably already know from your favourite testing framework. So for testing purposes you can use pretty much anything you like.

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 companies use Karma?
What companies use Mocha?
See which teams inside your own company are using Karma or Mocha.
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What tools integrate with Karma?
What tools integrate with Mocha?

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What are some alternatives to Karma and Mocha?
Jasmine
Jasmine is a Behavior Driven Development testing framework for JavaScript. It does not rely on browsers, DOM, or any JavaScript framework. Thus it's suited for websites, Node.js projects, or anywhere that JavaScript can run.
Jest
Jest provides you with multiple layers on top of Jasmine.
Protractor
Protractor is an end-to-end test framework for Angular and AngularJS applications. Protractor runs tests against your application running in a real browser, interacting with it as a user would.
Selenium
Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that. Boring web-based administration tasks can (and should!) also be automated as well.
BrowserStack
BrowserStack is a leading software testing platform for developers to comprehensively test their websites and mobile applications across 2,000+ real browsers and devices in a single cloud platform—and at scale.
See all alternatives