def testRelativeDiscountApplication(self):
     # Ensures that relative discounts get applied to the total item cost not the item cost after other discounts
     cost = discount_calc(100, 10, 10)
     self.assertEqual(cost, 80)
 def testNoNegativePrices(self):
     cost = discount_calc(7, 101, 0)
     self.assertEqual(cost, 0)
 def testStandardDiscount(self):
     cost = discount_calc(7, 1.25, 1.01)
     self.assertEqual(cost, 5.9025)
 def testNegativeAbsoluteDiscounts(self):
     with self.assertRaises(ValueError):
         cost = discount_calc(100, 10, -10)