Promises with stubs in Mocha

test.js

chai      = require('chai')
sinonChai = require('sinon-chai')
chai.use(sinonChai)
sinon     = require('sinon')
expect    = chai.expect
Q         = require('q')

var db = {

  query: function(sql) {
    d = Q.defer()

    d.resolve([{user: 'chris', id: 1}])

    return d.promise
  }
}

describe('Promise with stubs', function() {

  it('should stub a method that returns a promise', function(done) {

    querySpy = sinon.stub(db, 'query').returns(Q.resolve([{user: 'derek', id: 2}]))

    querySpy('SELECT * FROM users').done(function(result) {
      expect(result[0].id).to.be.equal(2)

      db.query.restore()

      done()

    })

  })

  it('should stub a method (with arguments) that returns a promise', function(done) {

    querySpy = sinon.stub(db, 'query').withArgs('SELECT * FROM users').returns(Q.resolve([{user: 'derek', id: 2}]))

    querySpy('SELECT * FROM users').done(function(result) {
      expect(result[0].id).to.be.equal(2)

      db.query.restore()

      done()

    })

  })

})