code: def test_astype_object_datetime_categories(self):
      # GH#40754
      cat = Categorical(to_datetime(["2021-03-27", NaT]))
      result = cat.astype(object)
      expected = np.array(
          [Timestamp("2021-03-27 00:00:00"), NaT], dtype="object"
      )
      tm.assert_numpy_array_equal(result, expected)
  
file_path: pandas/pandas/tests/arrays/categorical/test_astype.py
imports: import numpy
  import pytest
  from pandas import Categorical, CategoricalDtype, CategoricalIndex, DatetimeIndex, Interval, NaT, Period, Timestamp, array, to_datetime
  import pandas._testing
label_desc: Use image node_id 8 for calling the TestAstype obj's underlying member method code with example usage: obj.test_astype_object_datetime_categories() without return types