code: def test_astype_category(self, dtype_ordered, ordered):
      # GH#10696/GH#18593
      data = list("abcaacbab")
      cat = Categorical(data, categories=list("bac"), ordered=ordered)
  
      # standard categories
      dtype = CategoricalDtype(ordered=dtype_ordered)
      result = cat.astype(dtype)
      expected = Categorical(
          data, categories=cat.categories, ordered=dtype_ordered
      )
      tm.assert_categorical_equal(result, expected)
  
      # non-standard categories
      dtype = CategoricalDtype(list("adc"), dtype_ordered)
      result = cat.astype(dtype)
      expected = Categorical(data, dtype=dtype)
      tm.assert_categorical_equal(result, expected)
  
      if dtype_ordered is False:
          # dtype='category' can't specify ordered, so only test once
          result = cat.astype("category")
          expected = cat
          tm.assert_categorical_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 7 for calling the TestAstype obj's underlying member method code with example usage: obj.test_astype_category(dtype_ordered, ordered) without return types