public void CalculateTotalTax_WithMultipleItems_CalculatesTaxValue()
{
//arrange
double price = 45.35;
int quantity = 4;
ShoppingBasketItem item = new ShoppingBasketItem(new Product("test", price), quantity);
double expectedTax = item.CalculateSingleItemTax() * quantity;
//act
double actualTax = item.CalculateTotalTax();
//assert
Assert.AreEqual(expectedTax, actualTax, "total tax incorrectly calculated for item with quantity of 4");
}
public void AddItem_WithNewBasket_UpdatesTotals()
{
//arrange
ShoppingBasket basket = new ShoppingBasket();
ShoppingBasketItem item = new ShoppingBasketItem(new Product("test", 5.5, ProductType.Other));
double expetedTotalCost = item.CalculateTotalCost();
double expectedTotalTax = item.CalculateTotalTax();
//act
basket.AddItem(item);
//assert
Assert.AreEqual(expectedTotalTax, basket.TotalTax, "Total tax not updated correctly");
Assert.AreEqual(expetedTotalCost, basket.TotalCost, "Total cost not update correctly");
}
public void AddItem_WithMultipleItems_UpdatesTotals()
{
//arrange
ShoppingBasket basket = new ShoppingBasket();
ShoppingBasketItem item1 = new ShoppingBasketItem(new Product("test", 5.5, ProductType.Other));
ShoppingBasketItem item2 = new ShoppingBasketItem(new Product("test", 8.75, ProductType.Food));
double expetedTotalCost = item1.CalculateTotalCost() + item2.CalculateTotalCost();
double expectedTotalTax = item1.CalculateTotalTax() + item2.CalculateTotalTax();
//act
basket.AddItem(item1);
basket.AddItem(item2);
//assert
Assert.AreEqual(expectedTotalTax, basket.TotalTax, "Total tax not updated correctly");
Assert.AreEqual(expetedTotalCost, basket.TotalCost, "Total cost not update correctly");
}
