def METHOD_NAME(tmpdir):
    """task that takes file as an input"""
    os.chdir(tmpdir)
    arr = np.array([2])
    # creating abs path
    file = os.path.join(os.getcwd(), "arr1.npy")
    np.save(file, arr)
    nn = file_add2(name="add2", file=file)
    with Submitter(plugin="cf") as sub:
        sub(nn)
    # checking the results
    results = nn.result()
    res = np.load(results.output.out)
    assert res == np.array([4])