Tatva-Artha

  # Version: V1
  def current_user_session
    return @current_user_session if defined?(@current_user_session)
    @current_user_session = UserSession.find
  end

  # Version: V1
  def current_user_session
    unless @current_user_session
      @current_user_session = UserSession.find
    end
    @current_user_session
    # the above code could also be written as: @current_user_session ||= UserSession.find
  end

  # Test for when "logout" is invoked, the user-session is properly destroyed and user is redirected
  context "with a logged-in user" do
    setup do
      User.create(:username => "foo", :email => 'foo@company.com', :password => "secret", :password => "secret")
      UserSession.create(:username => "foo", :password => "secret")
      assert controller.logged_in?
    end
    should "destroy session and redirect to root page on logout" do
      post :destroy
      assert_nil(UserSession.find)
      assert_redirected_to root_url
    end
  end

  # Test for when "logout" is invoked, the user-session is properly destroyed and user is redirected
  context "with a logged-in user" do
    setup do
      User.create(:username => "foo", :email => 'foo@company.com', :password => "secret", :password => "secret")
      # The following line is to make sure user is not logged in initially
      # However, this line will end up calling controller.current_user_session and will fixate @current_user_session to nil for the rest of the test !!!
      assert_nil controller.logged_in?
      UserSession.create(:username => "foo", :password => "secret")
      assert controller.logged_in?
    end
    should "destroy session and redirect to root page on logout" do
      post :destroy
      assert_nil(UserSession.find)
      assert_redirected_to root_url
    end
  end