code: def test_iter(self):
      for xp in (numpy, cupy):
          it = xp.zeros((2, 3, 4)).flat
          assert iter(it) is it
  
imports: import unittest
  import warnings
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 2 for calling the TestFlatiter obj's underlying member method code with example usage: obj.test_iter() without return types