code: def test_invert_zerodim(self):
      self.check_zerodim_op(operator.invert)
  
imports: import operator
  import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 4 for calling the TestArrayIntUnaryOp obj's underlying member method code with example usage: obj.test_invert_zerodim() without return types