def METHOD_NAME(self) -> None:
    """Test handling of IDs containing more than one colon."""
    # The domain starts after the first colon.
    # These functions must interpret things consistently.
    self.assertFalse(self.hs.is_mine_id("@user:test:test"))
    self.assertEqual("user", get_localpart_from_id("@user:test:test"))
    self.assertEqual("test:test", get_domain_from_id("@user:test:test"))