def test_several_awards():
award1 = Normal(expires_in=5, quality=10)
award2 = BlueFirst(expires_in=3, quality=10)
award1.update_quality()
award2.update_quality()
assert award1.quality == 9
assert award1.expires_in == 4
assert award2.quality == 11
assert award2.expires_in == 2
def test_normal_award(initial_expires_in, initial_quality, expected_quality):
award = Normal(expires_in=initial_expires_in, quality=initial_quality)
award.update_quality()
assert award.expires_in == initial_expires_in - 1
assert award.quality == expected_quality