def clean_semver(cls, version_spec):
        return re.sub(r"([<>=~])\s+?v?", "\\1", version_spec, re.IGNORECASE)
def test_equal_to():
    """Equal to y."""
    p = are.equal_to(1)
    ps = [p(x) for x in range(1, 6)]
    assert ps == [True, False, False, False, False]