code: def test_parent(self, values_es, true_values_lti):
      # test dataframe with time index and all instances in child dataframe
      if values_es.dataframe_type != Library.PANDAS:
          pytest.xfail(
              "possible issue with either normalize_dataframe or add_last_time_indexes",
          )
      values_es.add_last_time_indexes()
      values = values_es["values"]
      lti_name = values.ww.metadata.get("last_time_index")
      assert len(values[lti_name]) == 10
      sorted_lti = to_pandas(values[lti_name]).sort_index()
      for v1, v2 in zip(sorted_lti, true_values_lti):
          assert (pd.isnull(v1) and pd.isnull(v2)) or v1 == v2
  
imports: from datetime import datetime
  import pandas
  import pytest
  from woodwork.logical_types import Categorical, Datetime, Integer
  from featuretools.entityset.entityset import LTI_COLUMN_NAME
  from featuretools.tests.testing_utils import to_pandas
  from featuretools.utils.gen_utils import Library, import_or_none
label_desc: Use image node_id 3 for calling the TestLastTimeIndex obj's underlying member method code with example usage: obj.test_parent(values_es, true_values_lti) without return types