carts_controller_test.rb

require 'test_helper'

class CartsControllerTest < ActionController::TestCase
  context "Adding a wine" do
    context "without a quantity" do
      setup { create_cart :wine_id => @mock_wine_id = 1 }
      
      should_assign_to :wine_id
      should_redirect_to 'wines_path'
      
      should "add to cart" do
        assert_not_nil get_cart[@mock_wine_id]
      end
      
      should "set quantity to 1" do
        assert_equal 1, get_cart[@mock_wine_id]
      end
      
      should "store cart data in the session" do
        assert_equal(get_cart.wines, get_cart_data_from_session)
      end
    end
    
    context "with a quantity" do
      setup { create_cart :wine_id => @mock_wine_id = 1, :wine_quantity => @mock_wine_quantity = 2 }
      
      should "add to cart" do
        assert_not_nil get_cart[@mock_wine_id]
      end
      
      should "add the correct quantity" do
        assert_equal @mock_wine_quantity, get_cart[@mock_wine_id]
      end
      
      should "update cart in session" do
        assert_equal(get_cart.wines, get_cart_data_from_session)
      end
    end
  end
  
  private
    def create_cart(data = {})
      post :create, data
    end
    
    def get_cart
      assigns(:cart)
    end
    
    def get_cart_data_from_session
      session[:cart]
    end
end