Shopping Cart Test case using MiniTests

shopping_cart_test.rb

class ShoppingCartTest < MiniTest::Test
  def setup
    @cart = ShoppingCart.new
  end

  def test_calculates_total_price_with_taxes
    item = Item.new("Apple", 10.00)

    # Stubbing the add_item method
    @cart.stub(:add_item, nil) do
      @cart.add_item(item)
      assert_equal 11.50, @cart.total_price_with_taxes
    end
  end
end