Mocha is a feature-rich JavaScript test framework running on Node.js and in 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.
Test Organization
Organize tests in suites and sub-suites using describe() and context(), and specify test cases using it().
"use strict";\nconst assert = require('assert');\ndescribe('Array', function() {\n describe('#indexOf()', function() {\n it('should return -1 when the value is not present', function() {\n assert.equal([1, 2, 3].indexOf(4), -1);\n });\n });\n});Asynchronous Testing
Support for testing asynchronous code with ease, using callbacks, promises, or async/await.
"use strict";\nconst assert = require('assert');\ndescribe('User', function() {\n describe('#save()', function() {\n it('should save without error', function(done) {\n const user = new User('Luna');\n user.save(function(err) {\n if (err) done(err);\n else done();\n });\n });\n });\n});Hooks
Lifecycle hooks such as before(), after(), beforeEach(), and afterEach() for setting up preconditions and clean-up after tests.
"use strict";\ndescribe('Connection', function() {\n before(function() {\n // runs once before the first test in this block\n });\n\n after(function() {\n // runs once after the last test in this block\n });\n\n beforeEach(function() {\n // runs before each test in this block\n });\n\n afterEach(function() {\n // runs after each test in this block\n });\n\n // test cases\n});Jest is a delightful JavaScript Testing Framework with a focus on simplicity. It works out of the box for any React project and is often compared to Mocha for its comprehensive feature set including a built-in assertion library and mock functions.
Jasmine is a behavior-driven development framework for testing JavaScript code. 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. It's compared to Mocha for its clean syntax and testing capabilities.
AVA is a test runner for Node.js with a concise API, detailed error output, and process isolation that lets you develop with confidence. It is often compared to Mocha for its modern, concurrent testing features, but differs in its approach to running tests in parallel by default.
Did you know Mocha is a dependency of over 100,000 projects published to npm alone?
Despite this, we're currently unable to merge most pull requests due to lack of maintenance resources.
Are you interested in triaging issues or reviewing open PRs? Have some time to hack on its codebase? If you would like to help maintain Mocha, please contact @boneskull on Gitter.
Thank you :kissing_heart: to all of you interested in helping. These are Mocha's immediate needs:
html reporter must be tested in browsernyan, landing, etc.) must be tested in both browser and Node.js contexts; PhantomJS can consume all console reportershtml reporter is still in dire need of coverage.exports in particular). Ideally this becomes a "matrix" where we repeat sets of integration tests across all interfaces.Once we gain ground on the above items, we can work together formalize our contribution guidelines and governance. For further info & ideas, please see our projects.
You needn't be a maintainer to submit a pull request for test coverage!
-- @boneskull, Jan 17 2016
Mocha is a simple, flexible, fun JavaScript test framework for node.js and the browser. For more information view the documentation.
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FAQs
simple, flexible, fun test framework
The npm package mocha receives a total of 1,532,241 weekly downloads. As such, mocha popularity was classified as popular.
We found that mocha demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 3 open source maintainers collaborating on the project.
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