def METHOD_NAME(manifest_obj):
    # test the 'create_manifest' method
    sig47 = utils.get_test_data('47.fa.sig')
    ss = sourmash.load_one_signature(sig47)
    def yield_sigs():
        yield ss, 'fiz'
    new_mf = manifest_obj.create_manifest(yield_sigs(),
                                          include_signature=False)
    assert len(new_mf) == 1
    new_mf2 = new_mf + manifest_obj
    assert len(new_mf2) == len(manifest_obj) + len(new_mf)