Mocha (JavaScript 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.

For other uses, see Mocha.
Mocha
Initial release22 November 2011 (2011-11-22)
Stable release
7.1.0 / 26 February 2020 (2020-02-26)
Repository
Written inJavaScript
TypeTest automation framework
LicenseMIT
Websitemochajs.org

Assertion Libraries

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

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

Usage and examples

 
$ 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);
      foo.bar(done);
    })
  })
})

See also

References
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