code: def test_get_indexer_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")
              ),
          ]
      )
      result = midx.get_indexer(midx)
      tm.assert_numpy_array_equal(result, np.arange(9, dtype=np.intp))
  
imports: from datetime import timedelta
  import re
  import numpy
  import pytest
  from pandas._libs import index
  from pandas.errors import InvalidIndexError, PerformanceWarning
  import pandas
  from pandas import Categorical, DataFrame, Index, MultiIndex, date_range
  import pandas._testing
label_desc: Use image node_id 3 for calling the TestGetIndexer obj's underlying member method code with example usage: obj.test_get_indexer_categorical_time() without return types