code: def test_sub(self, dt, offset2, _offset):
      off = offset2
      msg = "Cannot subtract datetime from offset"
      with pytest.raises(TypeError, match=msg):
          off - dt
      assert 2 * off - off == off
  
      assert dt - offset2 == dt + _offset(-3)
  
imports: from __future__ import annotations
  from datetime import datetime, time
  import pytest
  from pandas._libs.tslibs import Timedelta, Timestamp
  from pandas._libs.tslibs.offsets import BDay, BusinessHour, Nano
  from pandas import DatetimeIndex, _testing, date_range
  from pandas.tests.tseries.offsets.common import assert_offset_equal
label_desc: Use image node_id 10 for calling the TestBusinessHour obj's underlying member method code with example usage: obj.test_sub(dt, offset2, _offset) without return types