code: def test_fillna_tzaware(self):
      # with timezone
      # GH#15855
      df = DataFrame(
          {"A": [Timestamp("2012-11-11 00:00:00+01:00"), NaT]}
      )
      exp = DataFrame(
          {
              "A": [
                  Timestamp("2012-11-11 00:00:00+01:00"),
                  Timestamp("2012-11-11 00:00:00+01:00"),
              ]
          }
      )
      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, exp)
  
      df = DataFrame(
          {"A": [NaT, Timestamp("2012-11-11 00:00:00+01:00")]}
      )
      exp = DataFrame(
          {
              "A": [
                  Timestamp("2012-11-11 00:00:00+01:00"),
                  Timestamp("2012-11-11 00:00:00+01:00"),
              ]
          }
      )
      msg = "DataFrame.fillna with 'method' is deprecated"
      with tm.assert_produces_warning(FutureWarning, match=msg):
          res = df.fillna(method="bfill")
      tm.assert_frame_equal(res, 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 10 for calling the TestFillNA obj's underlying member method code with example usage: obj.test_fillna_tzaware() without return types