code: def test_interp_pad_datetime64tz_values(self):
      # GH#27628 missing.interpolate_2d should handle datetimetz values
      dti = date_range("2015-04-05", periods=3, tz="US/Central")
      ser = Series(dti)
      ser[1] = pd.NaT
  
      msg = "Series.interpolate with method=pad is deprecated"
      with tm.assert_produces_warning(FutureWarning, match=msg):
          result = ser.interpolate(method="pad")
      # check the "use ffill instead" is equivalent
      alt = ser.ffill()
      tm.assert_series_equal(result, alt)
  
      expected = Series(dti)
      expected[1] = expected[0]
      tm.assert_series_equal(result, expected)
  
imports: import numpy
  import pytest
  import pandas.util._test_decorators
  import pandas
  from pandas import Index, MultiIndex, Series, date_range, isna
  import pandas._testing
label_desc: Use image node_id 36 for calling the TestSeriesInterpolateData obj's underlying member method code with example usage: obj.test_interp_pad_datetime64tz_values() without return types