def test_reference_counter(int_: AlternativeInt) -> None:
int_refcount_before = sys.getrefcount(int_)
result = int_.bit_length()
int_refcount_after = sys.getrefcount(int_)
assert int_refcount_after == int_refcount_before
def test_basic(int_: AlternativeInt) -> None:
result = int_.bit_length()
assert isinstance(result, AlternativeInt)
def test_product(first: AlternativeInt, second: AlternativeInt) -> None:
result = (first * second).bit_length()
assert result <= first.bit_length() + second.bit_length()
def test_evenness(int_: AlternativeInt) -> None:
result = int_.bit_length()
assert result == (-int_).bit_length()
def test_positive_definiteness(int_: AlternativeInt) -> None:
result = int_.bit_length()
assert equivalence(not result, not int_)