Strange behavior with mocha/chai/sequelize

error.coffee

chai = require  "chai"
crypto = require "crypto"
Sequelize = require "sequelize"

chai.should()
sequelize = new Sequelize 'talk', 'root','root', {
  host: 'localhost'
  logging: false
}

User = sequelize.define 'User', {
  name:  type: Sequelize.STRING,
  key:   type: Sequelize.STRING,
  level: type: Sequelize.INTEGER, defaultValue: 0
}, instanceMethods: {
  addKey: (key) ->
    this.key = crypto.createHash('md5').update(key).digest("hex");
  }


describe 'User instance', ->
  it 'Should insert to db', (done) ->
    user1 = User.build { name: 'John Doe' }
    user1.save().success ->
      # Let's make it fail from here
      user1.id.should.equal null
      done()

  it 'Should insert to db', (done) ->
    user1 = User.build { name: 'John Doe' }
    user1.save().success ->
      user1.id.should.not.equal null
      done()

error.output.txt

 PolCPP$ mocha --compilers coffee:coffee-script -R spec


  User instance
    1) Should insert to db
    2) Should insert to db


  ✖ 2 of 2 tests failed:

  1) User instance Should insert to db:
     expected 89 to equal null
  

  2) User instance Should insert to db:
     Error: timeout of 2000ms exceeded
      at Object.<anonymous> (/usr/local/lib/node_modules/mocha/lib/runnable.js:142:14)
      at Timer.ontimeout (timers.js:94:19)

no_error.coffee

chai = require  "chai"
crypto = require "crypto"
Sequelize = require "sequelize"

chai.should()
sequelize = new Sequelize 'talk', 'root','root', {
  host: 'localhost'
  logging: false
}

User = sequelize.define 'User', {
  name:  type: Sequelize.STRING,
  key:   type: Sequelize.STRING,
  level: type: Sequelize.INTEGER, defaultValue: 0
}, instanceMethods: {
  addKey: (key) ->
    this.key = crypto.createHash('md5').update(key).digest("hex");
  }


describe 'User instance', ->
  it 'Should insert to db', (done) ->
    user1 = User.build { name: 'John Doe' }
    user1.save().success ->
      user1.id.should.not.equal null
      done()

  it 'Should insert to db', (done) ->
    user1 = User.build { name: 'John Doe' }
    user1.save().success ->
      user1.id.should.not.equal null
      done()

no_error_output.txt

$ mocha --compilers coffee:coffee-script -R spec


  User instance
    ✓ Should insert to db 
    ✓ Should insert to db 


  ✔ 2 tests complete (28ms)