code: def test_format_date(self):
      msg = "DatetimeIndex.format is deprecated"
      with tm.assert_produces_warning(FutureWarning, match=msg):
          formatted = pd.to_datetime(
              [datetime(2003, 1, 1), NaT]
          ).format()
      assert formatted[0] == "2003-01-01"
      assert formatted[1] == "NaT"
  
imports: from datetime import datetime
  import dateutil.tz
  import numpy
  import pytest
  import pytz
  import pandas
  from pandas import DatetimeIndex, NaT, Series
  import pandas._testing
label_desc: Use image node_id 5 for calling the TestFormat obj's underlying member method code with example usage: obj.test_format_date() without return types