code: def test_combine_first_timezone_series_with_empty_series(self):
      # GH 41800
      time_index = date_range(
          datetime(2021, 1, 1, 1),
          datetime(2021, 1, 1, 10),
          freq="h",
          tz="Europe/Rome",
      )
      s1 = Series(range(10), index=time_index)
      s2 = Series(index=time_index)
      msg = "The behavior of array concatenation with empty entries is deprecated"
      with tm.assert_produces_warning(FutureWarning, match=msg):
          result = s1.combine_first(s2)
      tm.assert_series_equal(result, s1)
  
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 6 for calling the TestCombineFirst obj's underlying member method code with example usage: obj.test_combine_first_timezone_series_with_empty_series() without return types