public void CalculateSingleTax_WithImportTaxAndExemptTaxAndRoundingRule_CalculatesTaxValue()
{
//arrange
double price = 100.99;
ShoppingBasketItem item = new ShoppingBasketItem(new Product("test", price, ProductType.Food), true);
double expectedTax = (new RoundingTaxRule().ApplyTaxRule(new ExemptSalesTaxRate().CalculateTax(price))) + (new RoundingTaxRule().ApplyTaxRule(new ImportSalesTaxRate().CalculateTax(price)));
//act
double actualTax = item.CalculateSingleItemTax();
//assert
Assert.AreEqual(expectedTax, actualTax, "Single item tax incorrectly calculated for item with import and exempt tax rate");
}
public void CalculateSingleTax_WithBasicTaxAndRoundingRule_CalculatesTaxValue()
{
//arrange
double price = 1.5;
ShoppingBasketItem item = new ShoppingBasketItem(new Product("test", price));
double expectedTax = new RoundingTaxRule().ApplyTaxRule(new BasicSalesTaxRate().CalculateTax(price));
//act
double actualTax = item.CalculateSingleItemTax();
//assert
Assert.AreEqual(expectedTax, actualTax, "Single item tax incorrectly calculated for item with basic tax rate");
}
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 CalculateTotalCost_WithMultipleItems_CalculatesTotalCost()
{
//arrange
double price = 12.5;
int quantity = 3;
ShoppingBasketItem item = new ShoppingBasketItem(new Product("test", price), quantity);
double expectedTax = (item.CalculateSingleItemTax() + price) * quantity;
//act
double actualTax = item.CalculateTotalCost();
//assert
Assert.AreEqual(expectedTax, actualTax, "total cost incorrectly calculated for item with quantity of 3");
}
