---
title: Mocha.js
category: JavaScript libraries
---

### BDD

    mocha.setup('bdd');

    describe('something', function() {
      beforeEach(function() {
      });

      it('should work', function() {
      });
    });

### Async

    it('should save', function(done) {
      var user = new User();
      user.save(function(err) {
        if (err) throw err;
        done();
      });
    });

### Chai: Shoulds

    chai.should();

    foo.should.be.a('string');
    foo.should.equal('bar');
    foo.should.have.length(3);
    tea.should.have.property('flavors').with.length(3);

### See also

 * [Mocha TDD](mocha-tdd.html)
 * [Mocha HTML](mocha-html.html)
 * [Chai](chai.html)
 * [Sinon](sinon.html)
 * [Sinon Chai](sinon-chai.html)