Similar controller specs

another_controller_spec.rb

describe SomeController do
  context "if user is not logged in" do
    specify "GET 'show' should redirect to login page" do
      get :show
      response.should redirect_to login_path
    end

    specify "PUT 'update' should redirect to login page" do
      put :update
      response.should redirect_to login_path
    end

    # ...
  end
end

some_controller_spec.rb

describe SomeController do
  context "if user is not logged in" do
    actions = [
      Proc.new { get :show },
      Proc.new { get :edit },
      Proc.new { put :update },
      # ....
    ]

    actions.each do |action|
      specify do
        instance_eval &action
        should redirect_to login_path
      end
    end
  end
end