code: def test_na_actions_categorical(self):
      cat = Categorical([1, 2, 3, np.nan], categories=[1, 2, 3])
      vals = ["a", "b", np.nan, "d"]
      df = DataFrame({"cats": cat, "vals": vals})
      cat2 = Categorical([1, 2, 3, 3], categories=[1, 2, 3])
      vals2 = ["a", "b", "b", "d"]
      df_exp_fill = DataFrame({"cats": cat2, "vals": vals2})
      cat3 = Categorical([1, 2, 3], categories=[1, 2, 3])
      vals3 = ["a", "b", np.nan]
      df_exp_drop_cats = DataFrame({"cats": cat3, "vals": vals3})
      cat4 = Categorical([1, 2], categories=[1, 2, 3])
      vals4 = ["a", "b"]
      df_exp_drop_all = DataFrame({"cats": cat4, "vals": vals4})
  
      # fillna
      res = df.fillna(value={"cats": 3, "vals": "b"})
      tm.assert_frame_equal(res, df_exp_fill)
  
      msg = "Cannot setitem on a Categorical with a new category"
      with pytest.raises(TypeError, match=msg):
          df.fillna(value={"cats": 4, "vals": "c"})
  
      msg = "DataFrame.fillna with 'method' is deprecated"
      with tm.assert_produces_warning(FutureWarning, match=msg):
          res = df.fillna(method="pad")
      tm.assert_frame_equal(res, df_exp_fill)
  
      # dropna
      res = df.dropna(subset=["cats"])
      tm.assert_frame_equal(res, df_exp_drop_cats)
  
      res = df.dropna()
      tm.assert_frame_equal(res, df_exp_drop_all)
  
      # make sure that fillna takes missing values into account
      c = Categorical([np.nan, "b", np.nan], categories=["a", "b"])
      df = DataFrame({"cats": c, "vals": [1, 2, 3]})
  
      cat_exp = Categorical(["a", "b", "a"], categories=["a", "b"])
      df_exp = DataFrame({"cats": cat_exp, "vals": [1, 2, 3]})
  
      res = df.fillna("a")
      tm.assert_frame_equal(res, df_exp)
  
imports: import numpy
  import pytest
  from pandas._config import using_pyarrow_string_dtype
  from pandas import Categorical, DataFrame, DatetimeIndex, NaT, PeriodIndex, Series, TimedeltaIndex, Timestamp, date_range, to_datetime
  import pandas._testing
  from pandas.tests.frame.common import _check_mixed_float
label_desc: Use image node_id 12 for calling the TestFillNA obj's underlying member method code with example usage: obj.test_na_actions_categorical() without return types