code: def test_copyto_where(self, xp, dtype):
      dst = xp.ones(self.dst_shape, dtype=dtype)
      mask = (
          testing.shaped_arange(self.dst_shape, xp, dtype) % 2
      ).astype(xp.bool_)
      xp.copyto(dst, self.src, where=mask)
      return dst
  
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 2 for calling the TestCopytoFromScalar obj's underlying member method code with example usage: obj.test_copyto_where(xp, dtype) and returns: dst