def yaml(self):
        return yaml.dump(self.serialized, default_flow_style=False,
                         encoding=None)
def test_above_or_equal_to():
    """Greater than or equal to y."""
    p = are.above_or_equal_to(4)
    ps = [p(x) for x in range(1, 6)]
    assert ps == [False, False, False, True, True]