code: def test_period_add_sub_td64_nat(self, unit):
      # GH#47196
      per = Period("2022-06-01", "D")
      nat = np.timedelta64("NaT", unit)
  
      assert per + nat is NaT
      assert nat + per is NaT
      assert per - nat is NaT
  
      with pytest.raises(TypeError, match="unsupported operand"):
          nat - per
  
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 11 for calling the TestPeriodArithmetic obj's underlying member method code with example usage: obj.test_period_add_sub_td64_nat(unit) without return types