public void Can_FirstDiscount_ApplyDiscount()
{
IDiscount discount = new FirstDiscount();
decimal res1 = discount.ApplyDiscount(5);
decimal res2 = discount.ApplyDiscount(10);
decimal res3 = discount.ApplyDiscount(50);
decimal res4 = discount.ApplyDiscount(100);
decimal res5 = discount.ApplyDiscount(200);
Assert.AreEqual(5, res1);
Assert.AreEqual(10, res2);
Assert.AreEqual(45, res3);
Assert.AreEqual(90, res4);
Assert.AreEqual(160, res5);
}
public void Can_FirstDiscount_Generate_Exception()
{
IDiscount discount = new FirstDiscount();
decimal res1 = discount.ApplyDiscount(-1);
}