code: def test_fillna_limit(self):
      ser = Series(np.nan, index=[0, 1, 2])
      result = ser.fillna(999, limit=1)
      expected = Series([999, np.nan, np.nan], index=[0, 1, 2])
      tm.assert_series_equal(result, expected)
  
      result = ser.fillna(999, limit=2)
      expected = Series([999, 999, np.nan], index=[0, 1, 2])
      tm.assert_series_equal(result, 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 6 for calling the TestSeriesFillNA obj's underlying member method code with example usage: obj.test_fillna_limit() without return types