code: def test_copy(self, _offset):
      # GH 17452
      off = _offset(weekmask="Mon Wed Fri")
      assert off == off.copy()
  
imports: from __future__ import annotations
  from datetime import date, datetime, timedelta
  import numpy
  import pytest
  from pandas._libs.tslibs.offsets import CBMonthBegin, CBMonthEnd, CDay
  import pandas._testing
  from pandas.tests.tseries.offsets.common import assert_is_on_offset, assert_offset_equal
  from pandas.tseries import offsets
label_desc: Use image node_id 4 for calling the TestCommonCBM obj's underlying member method code with example usage: obj.test_copy(_offset) without return types