code: def test_reindex_date_fill_value(self):
      # passing date to dt64 is deprecated; enforced in 2.0 to cast to object
      arr = date_range("2016-01-01", periods=6).values.reshape(3, 2)
      df = DataFrame(arr, columns=["A", "B"], index=range(3))
  
      ts = df.iloc[0, 0]
      fv = ts.date()
  
      res = df.reindex(
          index=range(4), columns=["A", "B", "C"], fill_value=fv
      )
  
      expected = DataFrame(
          {
              "A": df["A"].tolist() + [fv],
              "B": df["B"].tolist() + [fv],
              "C": [fv] * 4,
          },
          dtype=object,
      )
      tm.assert_frame_equal(res, expected)
  
      # only reindexing rows
      res = df.reindex(index=range(4), fill_value=fv)
      tm.assert_frame_equal(res, expected[["A", "B"]])
  
      # same with a datetime-castable str
      res = df.reindex(
          index=range(4),
          columns=["A", "B", "C"],
          fill_value="2016-01-01",
      )
      expected = DataFrame(
          {
              "A": df["A"].tolist() + [ts],
              "B": df["B"].tolist() + [ts],
              "C": [ts] * 4,
          },
      )
      tm.assert_frame_equal(res, expected)
  
imports: from datetime import datetime, timedelta
  import inspect
  import numpy
  import pytest
  from pandas._libs.tslibs.timezones import dateutil_gettz
  from pandas.compat import IS64, is_platform_windows
  from pandas.compat.numpy import np_version_gt2
  import pandas
  from pandas import Categorical, CategoricalIndex, DataFrame, Index, MultiIndex, Series, date_range, isna
  import pandas._testing
  from pandas.api.types import CategoricalDtype
label_desc: Use image node_id 4 for calling the TestDataFrameSelectReindex obj's underlying member method code with example usage: obj.test_reindex_date_fill_value() without return types