code: def test_singleton(self):
      shape = (2, 1, 8, 7)
      for p in TEST_NDARRAYS:
          arr = p(np.random.rand(*shape))
          out = SplitDimd("i", dim=1)({"i": arr})
          self.assertEqual(out["i"].shape, shape)
  
file_path: MONAI/tests/test_splitdimd.py
imports: from __future__ import annotations
  import unittest
  from copy import deepcopy
  import numpy
  import torch
  from parameterized import parameterized
  from monai.data.meta_tensor import MetaTensor
  from monai.transforms import LoadImaged
  from monai.transforms.utility.dictionary import SplitDimd
  from tests.utils import TEST_NDARRAYS, assert_allclose, make_nifti_image, make_rand_affine
label_desc: Use image node_id 3 for calling the TestSplitDimd obj's underlying member method code with example usage: obj.test_singleton() without return types