def METHOD_NAME(self):
    test_data1 = np.random.randint(0, 256, size=[3, 4, 4])
    test_data2 = np.random.randint(0, 256, size=[3, 4, 4])
    with tempfile.TemporaryDirectory() as tempdir:
        filepath = os.path.join(tempdir, "test_data.npz")
        np.savez(filepath, test_data1, test_data2)
        reader = NumpyReader()
        result = reader.get_data(reader.read(filepath))
    np.testing.assert_allclose(result[1]["spatial_shape"], test_data1.shape)
    np.testing.assert_allclose(result[0].shape, (2, 3, 4, 4))
    np.testing.assert_allclose(result[0], np.stack([test_data1, test_data2]))