How to unit test mongoose model?

So I tried to find this out on my own for the whole day. I've found some tips, but that's not enough.

I want make a query and manipulate with it's result. Problem is, the library I've used doesn't allow for that, as it returns a string, or object format. It doesn't simulate the result. Or at least I couldn't achieve it that way.

my code:

• controller:

  const UserMock = sinon.mock(User)
  const expectedResult = {
      "_id" : "58cc67ab9b11ec4cfd9ebb6e",
      "email" : "test@email.com", 
      "password" : "$2a$10$3Oka.IuS/xoGJ4CgxWOPVerE.IVvKemsZchegvwsxopSwIJ08G1P."
    }

  UserMock
    .expects('findOne').withArgs({ email: 'test@email.com' })
    .chain('exec')
    .resolves(expectedResult)

  User.findByEmail('test@email.com')
    .then((user) => user.comparePassword('password'))
    .then((user) => user.publishParse(user))
    .then((user) =>
    {
      UserMock.verify()
      UserMock.restore()
      assert.equal(user, expectedResult)
      done()
    })
    .then(console.log)
    .catch(console.log)

• model:

...

const userSchema = new Schema({
  email: {
    type: String,
    required: true,
    unique: true,
    dropDups: true,
    minlength: [5],
    validate: {
      isAsync: true,
      validator: isEmail,
      message: 'Invalid email'
    }
  },
  password: {
    type: String,
    required: true,
    minlength: [6, "Password must has at least 6 chars."]
  }
}, {
  toJSON: {
    transform: function(doc, ret)
    {
      ret.id = ret._id
      delete ret._id
      delete ret.__v
    }
  }
})

userSchema.methods.comparePassword = function(password)
{
  return new Promise((resolve, reject) =>
  {
    bcrypt.compare(password, this.password, (err, isMatch) =>
    {
      if (err || !isMatch)
      {
        return reject(err)
      }

      resolve(this)
    })
  })
}

userSchema.methods.publishParse = function()
{
  let _user = this.toJSON()
  delete _user.password
  return _user
}

userSchema.statics.findByEmail = function(email)
{
  return this.findOne({ email }).exec()
}

const User = mongoose.model('User', userSchema)
export default User

Libraries I used:

• mongoose
• mocha
• sinon
• sinon-mongoose

via Patryk Cieszkowski