code: def test_combine_first_dt_tz_values(self, tz_naive_fixture):
      ser1 = Series(
          pd.DatetimeIndex(
              ["20150101", "20150102", "20150103"], tz=tz_naive_fixture
          ),
          name="ser1",
      )
      ser2 = Series(
          pd.DatetimeIndex(
              ["20160514", "20160515", "20160516"], tz=tz_naive_fixture
          ),
          index=[2, 3, 4],
          name="ser2",
      )
      result = ser1.combine_first(ser2)
      exp_vals = pd.DatetimeIndex(
          ["20150101", "20150102", "20150103", "20160515", "20160516"],
          tz=tz_naive_fixture,
      )
      exp = Series(exp_vals, name="ser1")
      tm.assert_series_equal(exp, result)
  
file_path: pandas/pandas/tests/series/methods/test_combine_first.py
imports: from datetime import datetime
  import numpy
  import pandas
  from pandas import Period, Series, date_range, period_range, to_datetime
  import pandas._testing
label_desc: Use image node_id 5 for calling the TestCombineFirst obj's underlying member method code with example usage: obj.test_combine_first_dt_tz_values(tz_naive_fixture) without return types