def METHOD_NAME(self):
    with self._isolate_repo("suite_auto"):
        self._shed_create()
        diff_command = ["shed_diff", "-o", "diff"]
        diff_command.append("--raw")
        diff_command.extend(self._shed_args(read_only=True))
        self._check_exit_code(diff_command, exit_code=1)
        diff_command = ["shed_diff", "-o", "diff"]
        diff_command.extend(self._shed_args(read_only=True))
        self._check_exit_code(diff_command, exit_code=0)