public void Given_CartItem_When_QuantityDecreasedByMoreThanPossible_Then_AlwaysReturnItemWithQuantityOfOne(int decreaseQuantityBy)
{
// Arrange
var product = new Product("Milk", 1.0m);
var cartItem = new CartItem(product, 5);
// Act
var result = cartItem.DecreaseQuantity(decreaseQuantityBy);
// Assert
Assert.NotSame(cartItem, result);
Assert.Equal(1, result.Quantity);
}
public void Given_CartItem_When_QuantityDecreased_Then_ReturnNewItemWithUpdatedQuantity()
{
// Arrange
var product = new Product("Milk", 1.0m);
var cartItem = new CartItem(product, 5);
// Act
var result = cartItem.DecreaseQuantity(3);
// Assert
Assert.NotSame(cartItem, result);
Assert.Equal(2, result.Quantity);
}