code: def test_period_ops_offset(self):
      per = Period("2011-04-01", freq="D")
      result = per + offsets.Day()
      exp = Period("2011-04-02", freq="D")
      assert result == exp
  
      result = per - offsets.Day(2)
      exp = Period("2011-03-30", freq="D")
      assert result == exp
  
      msg = r"Input cannot be converted to Period\(freq=D\)"
      with pytest.raises(IncompatibleFrequency, match=msg):
          per + offsets.Hour(2)
  
      with pytest.raises(IncompatibleFrequency, match=msg):
          per - offsets.Hour(2)
  
imports: from datetime import timedelta
  import numpy
  import pytest
  from pandas._libs.tslibs.period import IncompatibleFrequency
  from pandas import NaT, Period, Timedelta, Timestamp, offsets
label_desc: Use image node_id 12 for calling the TestPeriodArithmetic obj's underlying member method code with example usage: obj.test_period_ops_offset() without return types