public void GetTotalPriceTest()
{
CustomerFormPresentationModel model = new CustomerFormPresentationModel(new Model());
model.AddMeal(model.FindMealByName("薯條（小包）"));
model.AddMeal(model.FindMealByName("薯條（中包）"));
model.AddToDisplayMealList();
Assert.AreEqual(model.GetTotalPrice(), 74);
}