code: def test_cupy(self):
      test_data = [[1, 2], [3, 4]]
      cupy_array = cp.ascontiguousarray(cp.asarray(test_data))
      result = ToTensord(keys="img")({"img": cupy_array})
      self.assertTrue(isinstance(result["img"], torch.Tensor))
      assert_allclose(result["img"], test_data, type_test=False)
  
file_path: MONAI/tests/test_to_tensord.py
imports: from __future__ import annotations
  import unittest
  import numpy
  import torch
  from parameterized import parameterized
  from monai.transforms import ToTensord
  from tests.utils import HAS_CUPY, TEST_NDARRAYS, assert_allclose, optional_import
label_desc: Use image node_id 3 for calling the TestToTensord obj's underlying member method code with example usage: obj.test_cupy() without return types