code: def test_stack_casting(self, xp, dtype1, dtype2, casting):
      a = testing.shaped_arange((3, 4), xp, dtype1)
      b = testing.shaped_arange((3, 4), xp, dtype1)
      # may raise TypeError or ComplexWarning
      return xp.stack((a, b), dtype=dtype2, casting=casting)
  
imports: import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy import cuda
label_desc: Use image node_id 60 for calling the TestJoin obj's underlying member method code with example usage: obj.test_stack_casting(xp, dtype1, dtype2, casting) and returns: xp