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Karma
Karma

487
313
+ 1
175
Mocha
Mocha

2.3K
1.5K
+ 1
399
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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.

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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Why do developers choose Karma?
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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.
      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
      Live, Web-Based Browser Testing Instant access to all real mobile and desktop browsers. Say goodbye to your lab of devices and virtual machines.
      LambdaTest
      LambdaTest is a cloud-based testing platform and it provides access to a powerful network cloud of 2000+ real browsers and operating system that helps testers in cross-browser and cross-platform compatibility testing.
      Sauce Labs
      Cloud-based automated testing platform enables developers and QEs to perform functional, JavaScript unit, and manual tests with Selenium or Appium on web and mobile apps. Videos and screenshots for easy debugging. Secure and CI-ready.
      See all alternatives
      Decisions about Karma and Mocha
      Dschinkel Schinkel
      Dschinkel Schinkel
      Enzyme
      Enzyme
      React
      React
      JavaScript
      JavaScript
      Jest
      Jest
      Mocha
      Mocha
      #Testdrivendevelopment
      #Bdd
      #Tdd

      I use both mocha and Jest because:

      • I don't care whether teams use Jest or Mocha. But jest is way too overhyped. Most devs are writing integration tests and think that it's so much better but frankly I don't write integration tests as the way to get both design feedback and confidence when I code. I adhere to the test pyramid, not ice cream cone or the dumb "trophy"

      • I TDD, so I only ever use the "API" of test frameworks. I don't do a lot of integration tests for TDD and all the bells and whistles Jest provides you from the command-line I just don't need. And I certainly do not care about or touch Jest Snapshots, I despise them

      • My tests are fast enough because I write isolated tests with TDD, so I don't run into performance issues. Example: I write my tests in a way that I can run 300 tests in literally 1 second with mocha. So the Jest ability to pinpoint and only run those tests which are affected by code changes. I want to run all of them every time when I TDD. It's a different mindset when you TDD

      • I also mainly code in IntelliJ or WebStorm because I feel the tools in that IDE far surpass VSCode and I also love running the test UI runner in it vs. lousy command-line

      • I feel both mocha and Jest read just fine in terms of code readability. Jest might have shorter assertion syntax but I don't really care. I just care that I can read the damn test and my tests are written well and my test descriptions, as well as the code itself including constants represent business language, not technical. I care most about BDD, clean code, 4 rules of simple design, and SOLID

      • I don't like using mock frameworks so no I don't use Jest's Mocking framework. I don't have to mock a lot in my tests due to the nature of how I strive to code...I keep my design simple and modular using principals such as clean code and 4 rules of simple design. If I must mock, I create very simple custom mocks with JS

      • On the contrary to the belief that integration tests and mount are the way to go (this belief drives me absolutely crazy, especially Dodd's promoting that), I TDD with shallow & enzyme. My tests are simple. My design is driven by my tests and my tests give me quick and useful feedback. I have a course I'm working on coming out soon on TDD with React to show you how to truly test the FE and why the ice cream cone and trophy suck (you're being scammed people). Watch for that here: https://twitter.com/DaveSchinkel/status/1062267649235791873

      Don't forget to upvote this post!

      Mocha Jest JavaScript React @jsdom Enzyme #tdd #bdd #testdrivendevelopment

      See more
      Scott Mebberson
      Scott Mebberson
      CTO / Chief Architect at Idearium Β· | 2 upvotes Β· 20.8K views
      Jest
      Jest
      Mocha
      Mocha

      We used to Mocha for as our primary Node.js test framework. We've now switched to Jest and haven't looked back.

      Jest is faster and requires less setup and configuration. The Mocha API and eco-system is vast and verified, but that also brings complexity.

      It you want to get in, write tests, execute them and get out, try Jest πŸ˜€

      See more
      Jack Graves
      Jack Graves
      Head of Product Development at Automation Consultants Β· | 3 upvotes Β· 25.1K views
      atAutomation ConsultantsAutomation Consultants
      Mocha
      Mocha
      Apache JMeter
      Apache JMeter
      Jest
      Jest
      JUnit
      JUnit

      We use JUnit and Jest to perform the bulk of our automated test scenarios, with additional work with Apache JMeter for performance testing - for example, the Atlassian Data Center compliance testing is performed with JMeter. Jest provides testing for the React interfaces, which make up the backend of our App offerings. JUnit is used for Unit Testing our Server-based Apps. Mocha is another tool we use.

      See more
      Interest over time
      Reviews of Karma and Mocha
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      How developers use Karma and Mocha
      Avatar of Matt Welke
      Matt Welke uses MochaMocha

      Used for unit testing when working with Node.js. Used over other testing frameworks because of good compatibility with TypeScript and ts-node.

      Avatar of Kang Hyeon Ku
      Kang Hyeon Ku uses MochaMocha

      javascript ν…ŒμŠ€νŠΈλ₯Ό μœ„ν•΄ 써본 ν”„λ ˆμž„μ›Œν¬ 이닀. 초반 유λͺ…ν•œ ν”„λ ˆμž„μ›Œν¬μ€‘ ν•˜λ‚˜μ˜€λŠ”λ° μš”μ¦˜μ€ λ„ˆλ¬΄ ν…ŒμŠ€νŠΈ ν”„λ ˆμž„μ›Œν¬λ„ λ‹€μ–‘ν•΄μ Έ 잘 λͺ¨λ₯΄κ² λ‹€. junit μ—κ²ŒλŠ” hamcrest 이 μžˆλ‹€λ©΄ mocha μ—κ²ŒλŠ” chaiκ°€ μžˆλ‹€.

      Avatar of Dave Woolfenden
      Dave Woolfenden uses MochaMocha

      Is a feature-rich JavaScript test framework running on Node.js and in the browser supporting asynchronous testing.

      Avatar of Riderman De Sousa Barbosa
      Riderman De Sousa Barbosa uses KarmaKarma

      All services, directives and controllers from angular are tested using Karma.

      Avatar of Kingsley Victor
      Kingsley Victor uses MochaMocha

      Mocha is ideal for running tests on apis built with Node's Express

      Avatar of Tim De Lange
      Tim De Lange uses MochaMocha

      Unit testing on shared code between brow ser and back end.

      Avatar of Ron Apelbaum
      Ron Apelbaum uses KarmaKarma

      I use Karma as a test runner for javascript unit tests

      Avatar of Giovanni Candido da Silva
      Giovanni Candido da Silva uses KarmaKarma

      Run unit and integration tests on real browsers

      Avatar of Glib Ischenko
      Glib Ischenko uses KarmaKarma

      Running Unit tests for Angular UI

      Avatar of Typeform
      Typeform uses KarmaKarma

      Testing frontend of admin part

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      How much does Mocha cost?
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