def test_no_discounts(self):
self.basket["Biscuits"] += 2
pricer = BasketPricer(self.basket, self.catalogue, self.offers)
self.assertEqual(0.0, pricer._calculate_total_discounts())
def test_calculate_discount_unknown_discount(self):
pricer = BasketPricer(self.basket, self.catalogue, self.offers)
with self.assertRaises(Exception):
self.assertEqual(2.0,
pricer._calculate_discount("Corona Vaccine", 1))
def test_calculate_subtotal(self):
""" sub-total: The undiscounted cost of items in a basket.
"""
self.basket["Biscuits"] += 2
self.basket["Shampoo"] += 2
pricer = BasketPricer(self.basket, self.catalogue, self.offers)
self.assertEqual(6.4, pricer._calculate_subtotal())
def test_calculate_total_discounts(self):
""" The amount of money which must be subtracted from the subtotal
in order to calculate the final price of the goods in the basket.
"""
self.basket["Baked Beans"] += 4
self.basket["Sardines"] += 1
pricer = BasketPricer(self.basket, self.catalogue, self.offers)
self.assertEqual(1.46, pricer._calculate_total_discounts())
def test_assignment_example_one(self):
self.basket["Baked Beans"] += 4
self.basket["Biscuits"] += 1
pricer = BasketPricer(self.basket, self.catalogue, self.offers)
self.assertEqual((5.16, 0.99, 4.17), pricer())
def test_empty_basket(self):
""" An empty basket has a sub-total, discount and total each of zero.
"""
pricer = BasketPricer(self.basket, self.catalogue, self.offers)
subtotal, discounts, total = pricer()
self.assertEqual([0.0, 0.0, 0.0], [subtotal, discounts, total])
def test_assignment_example_two(self):
self.basket["Baked Beans"] += 2
self.basket["Biscuits"] += 1
self.basket["Sardines"] += 2
pricer = BasketPricer(self.basket, self.catalogue, self.offers)
self.assertEqual((6.96, 0.95, 6.01), pricer())
def test_calculate_discount_buyXgetY(self):
pricer = BasketPricer(self.basket, self.catalogue, self.offers)
self.assertEqual(2.0, pricer._calculate_discount("Shampoo", 4))
def test_calculate_discount_percentage(self):
pricer = BasketPricer(self.basket, self.catalogue, self.offers)
self.assertEqual(0.95, pricer._calculate_discount("Sardines", 2))