def METHOD_NAME(self, xform_cls, input_dict, atol):
    """xform cls testing itk consistency"""
    img = LoadImage(image_only=True, simple_keys=True)(FILE_PATH)
    img = EnsureChannelFirst()(img)
    ref_1 = _create_itk_obj(img[0], img.affine)
    output = self.run_transform(img, xform_cls, input_dict)
    ref_2 = _create_itk_obj(output[0], output.affine)
    assert_allclose(output.pixdim, np.asarray(ref_2.GetSpacing()), type_test=False)
    expected = _resample_to_affine(ref_1, ref_2)
    # compare ref_2 and expected results from itk
    diff = np.abs(itk.GetArrayFromImage(ref_2) - itk.GetArrayFromImage(expected))
    avg_diff = np.mean(diff)
    self.assertTrue(avg_diff < atol, f"{xform_cls} avg_diff: {avg_diff}, tol: {atol}")