code: def test_period_add_integer(self):
      per1 = Period(freq="D", year=2008, month=1, day=1)
      per2 = Period(freq="D", year=2008, month=1, day=2)
      assert per1 + 1 == per2
      assert 1 + per1 == per2
  
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 2 for calling the TestPeriodArithmetic obj's underlying member method code with example usage: obj.test_period_add_integer() without return types