def METHOD_NAME(self):
    """
    Calling with `--help` should print help and exit 0.
    """
    argv = ['toolchain.py', '--help', '--storage-dir=/tmp']
    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 == 0
    assert m_print_help.call_args_list == [mock.call()]