code: def test_apply_nanoseconds(self, nano_case):
      offset, cases = nano_case
      for base, expected in cases.items():
          assert_offset_equal(offset, base, expected)
  
imports: from __future__ import annotations
  from datetime import datetime, time
  import numpy
  import pytest
  from pandas._libs.tslibs import Timestamp
  from pandas._libs.tslibs.offsets import BusinessHour, CustomBusinessHour, Nano
  from pandas.tests.tseries.offsets.common import assert_offset_equal
  from pandas.tseries.holiday import USFederalHolidayCalendar
label_desc: Use image node_id 16 for calling the TestCustomBusinessHour obj's underlying member method code with example usage: obj.test_apply_nanoseconds(nano_case) without return types