def METHOD_NAME(self):
    self.assertFalse(Intervald.open(0., 1.).empty())
    self.assertTrue(Intervald.open(0., 0.).empty())
    self.assertTrue(Intervald.left_closed(0., 0.).empty())
    self.assertTrue(Intervald.right_closed(0., 0.).empty())
    self.assertFalse(Intervald.closed(0., 0.).empty())
    self.assertTrue(Intervald.closed(1., 0.).empty())