code: def test_copyto_where(self, xp, dtype1, dtype2, casting):
      shape = (2, 3, 4)
      dst = xp.ones(shape, dtype=dtype1)
      src = numpy.array(1, dtype=dtype2)
      mask = (testing.shaped_arange(shape, xp, dtype1) % 2).astype(
          xp.bool_
      )
      with warnings.catch_warnings():
          warnings.simplefilter("ignore", numpy.ComplexWarning)
          xp.copyto(dst, src, casting=casting, 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 3 for calling the TestCopytoFromNumpyScalar obj's underlying member method code with example usage: obj.test_copyto_where(xp, dtype1, dtype2, casting) and returns: dst