def test_remove():
generator = IDGenerator(init_val=101)
assert (generator.next() == 101)
generator.remove_id(102)
generator.remove_id(104)
generator.remove_id(106)
assert (generator.next() == 103)
assert (generator.next() == 105)
assert (generator.next() == 107)
def test_contains():
generator = IDGenerator(init_val=10)
gids = [generator.next() for _ in range(10)]
assert (len(gids) == 10)
assert (10 in generator)
assert (19 in generator)
assert (20 not in generator)
generator.remove_id(54678)
assert (54678 in generator)
assert (54677 not in generator)
assert (54679 not in generator)
generator.remove_id(54677)
assert (54677 in generator)