code: def test_fillna_datelike(self):
      # with datelike
      # GH#6344
      df = DataFrame(
          {
              "Date": [NaT, Timestamp("2014-1-1")],
              "Date2": [Timestamp("2013-1-1"), NaT],
          }
      )
  
      expected = df.copy()
      expected["Date"] = expected["Date"].fillna(
          df.loc[df.index[0], "Date2"]
      )
      result = df.fillna(value={"Date": df["Date2"]})
      tm.assert_frame_equal(result, 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 9 for calling the TestFillNA obj's underlying member method code with example usage: obj.test_fillna_datelike() without return types