code: def test_copy_next(self, xp):
      a = testing.shaped_arange((2, 3, 4), xp)
      it = a.flat
      it.__next__()
      return it.copy()
  
imports: import unittest
  import warnings
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 6 for calling the TestFlatiter obj's underlying member method code with example usage: obj.test_copy_next(xp) and returns: it