Shopping Cart test cases using RSpec

shopping_cart_spec.rb

require "rspec"

describe "ShoppingCart" do
  before { @cart = ShoppingCart.new }
  
  describe "#total_price_with_taxes" do
    it "calculates the total price with taxes" do
      
      # Mocking external calls
      allow(TaxCalculator).to receive(:calculate_tax).and_return(1.50)
      allow(InventoryService).to receive(:check_stock).and_return(true)

      @cart.add_item(Item.new("Apple", 10.00))

      expect(@cart.total_price_with_taxes).to eq(11.50)
    end
  end
end