code: def test_nibabel_3d(self):
      data = image_loader.load_image_obj(CASE_NIBABEL_3D).get_data()
      self.assertAllClose(data.shape, (256, 168, 256))
  
file_path: NiftyNet/tests/image_loader_test.py
imports: from __future__ import absolute_import, print_function
  import os
  import numpy
  import tensorflow
  import niftynet.io.image_loader
  from tests.niftynet_testcase import NiftyNetTestCase
label_desc: Use image node_id 1 for calling the ImageLoaderTest obj's underlying member method code with example usage: obj.test_nibabel_3d() without return types