code: def test_fillna_f32_upcast_with_dict(self):
      # GH-43424
      ser = Series([np.nan, 1.2], dtype=np.float32)
      result = ser.fillna({0: 1})
      expected = Series([1.0, 1.2], dtype=np.float32)
      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 27 for calling the TestSeriesFillNA obj's underlying member method code with example usage: obj.test_fillna_f32_upcast_with_dict() without return types