code: def test_fillna_skip_certain_blocks(self):
      # don't try to fill boolean, int blocks
  
      df = DataFrame(
          np.random.default_rng(2).standard_normal((10, 4)).astype(int)
      )
  
      # it works!
      df.fillna(np.nan)
  
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 25 for calling the TestFillNA obj's underlying member method code with example usage: obj.test_fillna_skip_certain_blocks() without return types