code: def test_fillna_with_multi_index_frame(self):
      # GH 47649
      pdf = DataFrame(
          {
              ("x", "a"): [np.nan, 2.0, 3.0],
              ("x", "b"): [1.0, 2.0, np.nan],
              ("y", "c"): [1.0, 2.0, np.nan],
          }
      )
      expected = DataFrame(
          {
              ("x", "a"): [-1.0, 2.0, 3.0],
              ("x", "b"): [1.0, 2.0, -1.0],
              ("y", "c"): [1.0, 2.0, np.nan],
          }
      )
      tm.assert_frame_equal(pdf.fillna({"x": -1}), expected)
      tm.assert_frame_equal(
          pdf.fillna({"x": -1, ("x", "b"): -2}), expected
      )
  
      expected = DataFrame(
          {
              ("x", "a"): [-1.0, 2.0, 3.0],
              ("x", "b"): [1.0, 2.0, -2.0],
              ("y", "c"): [1.0, 2.0, np.nan],
          }
      )
      tm.assert_frame_equal(
          pdf.fillna({("x", "b"): -2, "x": -1}), expected
      )
  
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 42 for calling the TestFillNA obj's underlying member method code with example usage: obj.test_fillna_with_multi_index_frame() without return types