def METHOD_NAME(tmpdir):
    with make_includes(str(tmpdir)) as includes:
        _yaml.roundtrip_dump({"(@)": ["a.yml"], "test": ["main"]}, str(tmpdir.join("main.yml")))
        main = _yaml.load(str(tmpdir.join("main.yml")), shortname=None)
        _yaml.roundtrip_dump({"test": ["a"]}, str(tmpdir.join("a.yml")))
        includes.process(main)
        assert main.get_str_list("test") == ["main"]