DRY your specs - Example: Sign in user

gistfile1.rb

# spec/support/controller_spec_helper.rb
module ControllerSpecHelper
  def sign_in_user(user)
    controller.stub!(:current_user).and_return user
  end
end

# spec/spec_helper.rb
RSpec.configure do |config|
  # [..]
  config.include(ControllerSpecHelper, :type => :controller)
end

# some controller spec where authentification is required
before :each do
  @user = Factory.create(:user)
  sign_in_user @user
end