def METHOD_NAME(self):
    """
    Calling with unknown args should print help and exit 1.
    """
    argv = ['toolchain.py', '--unknown']
    with patch_sys_argv(argv), raises_system_exit(
    ) as ex_info, patch_argparse_print_help() as m_print_help:
        ToolchainCL()
    assert ex_info.value.code == 1
    assert m_print_help.call_args_list == [mock.call()]