code: def test_diff_dt64tz(self):
      # with tz
      ser = Series(
          date_range("2000-01-01 09:00:00", periods=5, tz="US/Eastern"),
          name="foo",
      )
      result = ser.diff()
      expected = Series(
          TimedeltaIndex(["NaT"] + ["1 days"] * 4), name="foo"
      )
      tm.assert_series_equal(result, expected)
  
file_path: pandas/pandas/tests/series/methods/test_diff.py
imports: import numpy
  import pytest
  from pandas import Series, TimedeltaIndex, date_range
  import pandas._testing
label_desc: Use image node_id 6 for calling the TestSeriesDiff obj's underlying member method code with example usage: obj.test_diff_dt64tz() without return types