## test_helper:

  def full_create_params_nokia(options = {})
    { :nokia_user => {:login => 'mylogin',
                :activation_email => 'someemail@domain.fr',
                :activated_at => Time.new,
                :password => 'password',
                :password_confirmation => 'password',
                :remember_token_expires_at => Time.new,
                :location_zip => '90027',
                :dob => '1977-08-12',
                :mobile_phone_area => "415",
                :mobile_phone_prefix => "341",
                :mobile_phone_number => "7140",
                :carrier_id => '1'},
      :user_pref => {:newsletter => true} }.merge(options)
  end


## nokia_user_test:
  def test_should_validate_mobile
    assert_no_difference NokiaUser, :count do
      user = NokiaUser.new_with_associations(full_create_params_nokia(:nokia_user => {:mobile_phone_number => "abc"}))
      assert user.errors.on(:mobile_phone_number)
    end
  end

## nokia_user (model)
  def self.new_with_associations(params)
    user = NokiaUser.new(params[:nokia_user])

    logger.info "#{params[:nokia_user].inspect}"
    ...
  end