def METHOD_NAME(self) -> None:
    x = Variable()
    y = Variable()
    z = Variable()
    with warnings.catch_warnings():
        warnings.simplefilter("ignore")
        s = y*z
        self.assertTrue(s.is_quadratic())
        self.assertFalse(s.is_dcp())
        t = (x+y)**2 - s - z*z
        self.assertTrue(t.is_quadratic())
        self.assertFalse(t.is_dcp())