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Simple, flexible, fun javascript test framework for node.js & the browser
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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.
Mocha is a tool in the Javascript Testing Framework category of a tech stack.
Mocha is an open source tool with 19.6K GitHub stars and 2.7K GitHub forks. Here’s a link to Mocha's open source repository on GitHub

Who uses Mocha?

601 companies reportedly use Mocha in their tech stacks, including Coursera, Accenture, and Typeform.

2042 developers on StackShare have stated that they use Mocha.

Mocha Integrations

Karma, React.js Boilerplate, LambdaTest, CrossBrowserTesting , and Wallaby.js are some of the popular tools that integrate with Mocha. Here's a list of all 6 tools that integrate with Mocha.
Public Decisions about Mocha

Here are some stack decisions, common use cases and reviews by companies and developers who chose Mocha in their tech stack.

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:

Don't forget to upvote this post!

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

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Jack Graves
Jack Graves
Head of Product Development at Automation Consultants · | 3 upvotes · 87.4K views

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.

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Scott Mebberson
Scott Mebberson
CTO / Chief Architect at Idearium · | 2 upvotes · 38.7K views
Shared insights

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 😀

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React LoopBack Node.js ExpressJS Elasticsearch Kibana Logstash Sequelize Mocha Chai Visual Studio Code are the combo of technologies being used by me to build BestPrice Extension with all its micro-services & Web-based fragments

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Dave Woolfenden
Dave Woolfenden
Senior Enterprise Architect at eVectis Technologies LLC · | 1 upvotes · 22.5K views
Shared insights

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

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Shared insights

javascript 테스트를 위해 써본 프레임워크 이다. 초반 유명한 프레임워크중 하나였는데 요즘은 너무 테스트 프레임워크도 다양해져 잘 모르겠다. junit 에게는 hamcrest 이 있다면 mocha 에게는 chai가 있다. Mocha

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Mocha's Features

  • browser support
  • simple async support, including promises
  • test coverage reporting
  • string diff support
  • javascript API for running tests
  • proper exit status for CI support etc
  • auto-detects and disables coloring for non-ttys
  • maps uncaught exceptions to the correct test case
  • async test timeout support
  • test-specific timeouts
  • growl notification support
  • reports test durations
  • highlights slow tests
  • file watcher support
  • global variable leak detection

Mocha Alternatives & Comparisons

What are some alternatives to Mocha?
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 provides you with multiple layers on top of Jasmine.
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.
Cypress is a front end automated testing application created for the modern web. Cypress is built on a new architecture and runs in the same run-loop as the application being tested. As a result Cypress provides better, faster, and more reliable testing for anything that runs in a browser. Cypress works on any front-end framework or website.
Enzyme is a JavaScript Testing utility for React that makes it easier to assert, manipulate, and traverse your React Components' output.
See all alternatives

Mocha's Followers
2235 developers follow Mocha to keep up with related blogs and decisions.
Rob Vreeland
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