I\'m attempting to follow railstutorial.org, and am currently on Chapter 7, where you start using factories: http://railstutorial.org/chapters/modeling-and-viewing-users-two#sec
I have done so, 
add require 'factory_girl' to test_helper.rb and
@user = FactoryGirl.create(:user)
                                                                        In your spec use
  @user = FactoryGirl(:user)
instead of
  @user = Factory(:user)
                                                                        For me I had to add require 'factory_girl' to test_helper.rb
As per the latest version of Factory Girl (currently v4.0.0) rewrite factories.rb
FactoryGirl.define do 
  factory :user do
    name                  "Michael Hartl"
    email                 "mhartl@example.com"
    password              "foobar"
    password_confirmation "foobar"
  end
end
then call it from your users controller specs as:
FactoryGirl.create(:user)