code: def test_convert_bool(self):
      boolarr = np.ones((256, 256, 256), np.bool)
      img = image_loader.image2nibabel(boolarr)
  
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 3 for calling the ImageLoaderTest obj's underlying member method code with example usage: obj.test_convert_bool() without return types