def METHOD_NAME(request):
    graph = pd.DataFrame(np.append(get_test_graph(), np.array([['a','t','a']]*9), axis=0))
    graph.to_csv(request.param, header=None, index=None, sep='\t') 
    data_loader = GraphDataLoader(request.param)
    yield data_loader
    data_loader.clean()
    try:
        os.remove(request.param)
    except:
        del request.param