code: def test_reindex_multi_categorical_time(self):
      # https://github.com/pandas-dev/pandas/issues/21390
      midx = MultiIndex.from_product(
          [
              Categorical(["a", "b", "c"]),
              Categorical(
                  date_range("2012-01-01", periods=3, freq="h")
              ),
          ]
      )
      df = DataFrame({"a": range(len(midx))}, index=midx)
      df2 = df.iloc[[0, 1, 2, 3, 4, 5, 6, 8]]
  
      result = df2.reindex(midx)
      expected = DataFrame(
          {"a": [0, 1, 2, 3, 4, 5, 6, np.nan, 8]}, index=midx
      )
      tm.assert_frame_equal(result, expected)
  
imports: from datetime import datetime, timedelta
  import inspect
  import numpy
  import pytest
  from pandas._libs.tslibs.timezones import dateutil_gettz
  from pandas.compat import IS64, is_platform_windows
  from pandas.compat.numpy import np_version_gt2
  import pandas
  from pandas import Categorical, CategoricalIndex, DataFrame, Index, MultiIndex, Series, date_range, isna
  import pandas._testing
  from pandas.api.types import CategoricalDtype
label_desc: Use image node_id 41 for calling the TestDataFrameSelectReindex obj's underlying member method code with example usage: obj.test_reindex_multi_categorical_time() without return types