def test__apply_discount_on_price_with_nonexistant_value():
discount = Discount(data=DISCOUNT_DATA)
discount_value = 10
price = 200
item = {'article_id': 8, 'type': 'nonexistant', 'value': discount_value}
assert discount._apply_discount_on_price(discount=item, price=price)\
== price
def test__apply_discount_on_price_with_percentage_value():
discount = Discount(data=DISCOUNT_DATA)
discount_value = 10
price = 200
item = {'article_id': 8, 'type': 'percentage', 'value': discount_value}
assert discount._apply_discount_on_price(discount=item, price=price)\
== (price - price * discount_value / 100)