code: def test_fillna_numeric_inplace(self):
      x = Series(
          [np.nan, 1.0, np.nan, 3.0, np.nan], ["z", "a", "b", "c", "d"]
      )
      y = x.copy()
  
      return_value = y.fillna(value=0, inplace=True)
      assert return_value is None
  
      expected = x.fillna(value=0)
      tm.assert_series_equal(y, expected)
  
imports: from datetime import datetime, timedelta, timezone
  import numpy
  import pytest
  import pytz
  from pandas import Categorical, DataFrame, DatetimeIndex, NaT, Period, Series, Timedelta, Timestamp, date_range, isna, timedelta_range
  import pandas._testing
  from pandas.core.arrays import period_array
label_desc: Use image node_id 22 for calling the TestSeriesFillNA obj's underlying member method code with example usage: obj.test_fillna_numeric_inplace() without return types