code: def test_rsub_dtscalars(self, tz_naive_fixture):
      # In particular, check that datetime64 - Timestamp works GH#28286
      td = Timedelta(1235345642000)
      ts = Timestamp("2021-01-01", tz=tz_naive_fixture)
      other = ts + td
  
      assert other - ts == td
      assert other.to_pydatetime() - ts == td
      if tz_naive_fixture is None:
          assert other.to_datetime64() - ts == td
      else:
          msg = "Cannot subtract tz-naive and tz-aware datetime-like objects"
          with pytest.raises(TypeError, match=msg):
              other.to_datetime64() - ts
  
imports: from datetime import datetime, timedelta, timezone
  from dateutil.tz import gettz
  import numpy
  import pytest
  import pytz
  from pandas._libs.tslibs import OutOfBoundsDatetime, OutOfBoundsTimedelta, Timedelta, Timestamp, offsets, to_offset
  import pandas._testing
label_desc: Use image node_id 5 for calling the TestTimestampArithmetic obj's underlying member method code with example usage: obj.test_rsub_dtscalars(tz_naive_fixture) without return types