code: def test_feature_getitem(self, features_dict):
      fdict = features_lib.FeaturesDict(features_dict)
      self.assertEqual(fdict["integer"].dtype, np.int32)
      self.assertEqual(fdict["string"].dtype, np.object_)
  
imports: import pathlib
  import sys
  import textwrap
  from unittest import mock
  from absl import logging
  from absl.testing import parameterized
  import numpy
  import tensorflow
  from tensorflow_datasets import testing
  from tensorflow_datasets.core import features
label_desc: Use image node_id 4 for calling the FeatureDictTest obj's underlying member method code with example usage: obj.test_feature_getitem(features_dict) without return types