code: def test_add_bday_offset_nanos(self):
      # GH#55608
      idx = date_range(
          "2010/02/01", "2010/02/10", freq="12h", unit="ns"
      )
      off = BDay(offset=Timedelta(3, unit="ns"))
  
      result = idx + off
      expected = DatetimeIndex([x + off for x in idx])
      tm.assert_index_equal(result, expected)
  
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 23 for calling the TestBusinessHour obj's underlying member method code with example usage: obj.test_add_bday_offset_nanos() without return types