code: def test_apply_nanoseconds(self):
      tests = [
          (
              BusinessHour(),
              {
                  Timestamp("2014-07-04 15:00")
                  + Nano(5): Timestamp("2014-07-04 16:00")
                  + Nano(5),
                  Timestamp("2014-07-04 16:00")
                  + Nano(5): Timestamp("2014-07-07 09:00")
                  + Nano(5),
                  Timestamp("2014-07-04 16:00")
                  - Nano(5): Timestamp("2014-07-04 17:00")
                  - Nano(5),
              },
          ),
          (
              BusinessHour(-1),
              {
                  Timestamp("2014-07-04 15:00")
                  + Nano(5): Timestamp("2014-07-04 14:00")
                  + Nano(5),
                  Timestamp("2014-07-04 10:00")
                  + Nano(5): Timestamp("2014-07-04 09:00")
                  + Nano(5),
                  Timestamp("2014-07-04 10:00")
                  - Nano(5): Timestamp("2014-07-03 17:00")
                  - Nano(5),
              },
          ),
      ]
  
      for offset, cases in tests:
          for base, expected in cases.items():
              assert_offset_equal(offset, base, 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 21 for calling the TestBusinessHour obj's underlying member method code with example usage: obj.test_apply_nanoseconds() without return types