create user using factory in ruby on rails

factories.rb:-
-------------------
FactoryGirl.define do
  factory :user do
    email 'user@example.com'
    password 'welcome'
  end
end

user_spec.rb:-
---------------------
require 'spec_helper'

describe User do
  it 'has a valid factory' do
    FactoryGirl.create :user
  end
end