def test_price_empty_basket():
b = Basket()
c = {}
o = {}
sub_total, discount, total = price_basket(basket=b, catalogue=c, offers=o)
assert sub_total == 0
assert discount == 0
assert total == 0
def test_price_basket_buy_three_get_one_free_applicable():
b = Basket()
b.add(item_name="peas", count=3)
c = {"peas": 2.0}
o = [buy_x_get_y_free("peas", x=3, y=1)]
sub_total, discount, total = price_basket(basket=b, catalogue=c, offers=o)
assert sub_total == 6.0
assert discount == 2.0
assert total == 4.0
def test_price_basket_with_a_single_discunted_item():
b = Basket()
b.add(item_name="peas", count=1)
c = {"peas": 2.02}
o = [discounted_item("peas", 0.5)]
sub_total, discount, total = price_basket(basket=b, catalogue=c, offers=o)
assert sub_total == 2.02
assert discount == 1.01
assert total == 1.01
def test_price_basket_with_two_identical_items():
b = Basket()
b.add(item_name="peas", count=2)
c = {"peas": 2.01}
o = {}
sub_total, discount, total = price_basket(basket=b, catalogue=c, offers=o)
assert sub_total == 4.02
assert discount == 0
assert total == 4.02
def test_price_basket_with_single_item():
b = Basket()
b.add(item_name="peas")
c = {"peas": 2.01}
o = {}
sub_total, discount, total = price_basket(basket=b, catalogue=c, offers=o)
assert sub_total == 2.01
assert discount == 0
assert total == 2.01
def test_price_basket_cheapest_of_n_feee_with_two_qalifying_groups():
b = Basket()
b.add(item_name="peas", count=3)
b.add(item_name="shampoo", count=3)
c = {"peas": 2.0, "shampoo": 1.50}
o = [cheapest_x_of_n_items_free(items={"peas", "shampoo"}, n=3, x=1)]
sub_total, discount, total = price_basket(basket=b, catalogue=c, offers=o)
assert sub_total == 10.50
assert discount == 3.50
def test_price_basket_cheapest_of_n_feee_0():
b = Basket()
b.add(item_name="peas", count=2)
b.add(item_name="shampoo", count=1)
c = {"peas": 2.0, "shampoo": 1.50}
o = [cheapest_x_of_n_items_free(items={"peas", "shampoo"}, n=3, x=1)]
sub_total, discount, total = price_basket(basket=b, catalogue=c, offers=o)
assert sub_total == 5.50
assert discount == 1.50
assert total == 4.0