code: def test_where_datetimetz():
      # GH 15701
      timestamps = [
          "2016-12-31 12:00:04+00:00",
          "2016-12-31 12:00:04.010000+00:00",
      ]
      ser = Series(
          [Timestamp(t) for t in timestamps],
          dtype="datetime64[ns, UTC]",
      )
      rs = ser.where(Series([False, True]))
      expected = Series([pd.NaT, ser[1]], dtype="datetime64[ns, UTC]")
      tm.assert_series_equal(rs, expected)
  
imports: import numpy
  import pytest
  from pandas._config import using_pyarrow_string_dtype
  from pandas.core.dtypes.common import is_integer
  import pandas
  from pandas import Series, Timestamp, date_range, isna
  import pandas._testing
label_desc: Use image node_id 16 for calling a global function with example usage: test_where_datetimetz() without return types