How to use the shiv.constants.DISALLOWED_ARGS.keys function in shiv

    @pytest.mark.parametrize("arg", [arg for tup in DISALLOWED_ARGS.keys() for arg in tup])
    def test_disallowed_args(self, runner, arg):
        """This method tests that all the potential disallowed arguments match their error messages."""

        # run shiv with a disallowed argument
        result = runner(["-o", "tmp", arg])

        # get the 'reason' message:
        for disallowed in DISALLOWED_ARGS:
            if arg in disallowed:
                reason = DISALLOWED_ARGS[disallowed]

        assert result.exit_code == 1

        # assert we got the correct reason
        assert DISALLOWED_PIP_ARGS.format(arg=arg, reason=reason) in result.output