code: def test_copyto_where(self, xp, dtype):
      a = testing.shaped_arange((2, 3, 4), xp, dtype)
      b = testing.shaped_reverse_arange((2, 3, 4), xp, dtype)
      c = testing.shaped_arange((2, 3, 4), xp, "?")
      xp.copyto(a, b, where=c)
      return a
  
imports: import itertools
  import warnings
  import numpy
  import pytest
  import cupy
  from cupy import cuda
  from cupy import testing
label_desc: Use image node_id 9 for calling the TestBasic obj's underlying member method code with example usage: obj.test_copyto_where(xp, dtype) and returns: a