code: def test_unary_op_out_casting(self, device, dtypes):
      t = torch.tensor((1), dtype=dtypes[0], device=device)
      out = torch.empty(0, dtype=dtypes[1], device=device)
  
      ops = (torch.neg, torch.floor, torch.ceil)
      float_and_int_only_ops = {torch.floor, torch.ceil}
      real_only_ops = {torch.floor, torch.ceil}
      for op in ops:
          if dtypes[0] is not dtypes[1]:
              with self.assertRaises(RuntimeError):
                  op(t, out=out)
          elif op in real_only_ops and dtypes[0].is_complex:
              with self.assertRaises(RuntimeError):
                  op(t, out=out)
          elif (
              op in float_and_int_only_ops
              and (
                  not dtypes[0].is_floating_point
                  and not dtypes[0].is_complex
              )
              and (
                  not (
                      dtypes[0] == torch.int64
                      and dtypes[1] == torch.int64
                  )
              )
              and device != "meta"
          ):
              with self.assertRaises(RuntimeError):
                  op(t, out=out)
          else:
              self.assertEqual(op(t, out=out), op(t))
              self.assertEqual(op(t, out=out), out)
  
imports: from functools import wraps
  import itertools
  import unittest
  import torch
  from torch.testing._internal.common_utils import TestCase, run_tests, load_tests, make_tensor, TEST_NUMPY, set_default_dtype, torch_to_numpy_dtype_dict, numpy_to_torch_dtype_dict, skipIfTorchDynamo
  from torch.testing._internal.common_device_type import instantiate_device_type_tests, onlyNativeDeviceTypes, dtypes, onlyCPU, expectedFailureMeta, skipMeta
  from torch.testing._internal.common_dtype import all_types_and_complex_and, get_all_math_dtypes, floating_types, get_all_dtypes, float_to_corresponding_complex_type_map
  import numpy
  import operator
label_desc: Use image node_id 48 for calling the TestTypePromotion obj's underlying member method code with example usage: obj.test_unary_op_out_casting(device, dtypes) without return types