Mocha (JavaScript framework)

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Mocha (JavaScript framework) (logo).svg
Initial release22 November 2011 (2011-11-22)
Stable release
8.4.0 / 7 May 2021; 6 months ago (2021-05-07)
Written inJavaScript
TypeTest automation framework

Mocha is a JavaScript test framework for Node.js programs, featuring browser support, asynchronous testing, test coverage reports, and use of any assertion library.

Assertion Libraries[edit]

Mocha can be used with most JavaScript assertion libraries, including:

  • should.js
  • express.js
  • chai
  • better-assert
  • unexpected

Usage and examples[edit]

$ npm install -g mocha
$ mkdir test
var assert = require("assert")
describe('Foo', function(){
  describe('#getBar(value)', function(){
    it('should return 100 when value is negative') // placeholder
    it('should return 0 when value is positive', function(){
      assert.equal(0, Foo.getBar(10));
$  mocha
1 test complete (1ms)

For asynchronous testing, invoke the callback, and Mocha will wait for completion.

describe('Foo', function(){
  describe('#bar()', function(){
    it('should work without error', function(done){
      var foo = new Foo(128);;

See also[edit]


External links[edit]