code: def setUp(self):
      self.im, _ = create_test_image_2d(100, 100)
      self.fname = tempfile.NamedTemporaryFile(suffix=".nii.gz").name
  
imports: from __future__ import annotations
  import os
  import tempfile
  import unittest
  from pathlib import Path
  from typing import TYPE_CHECKING
  from unittest.case import skipUnless
  import numpy
  from parameterized import parameterized
  from monai.data import DataLoader, Dataset, create_test_image_2d
  from monai.data.image_reader import PILReader
  from monai.transforms import LoadImage, LoadImaged
  from monai.transforms.io.array import switch_endianness
  from monai.utils.enums import PostFix
  from monai.utils.module import optional_import
label_desc: Use image node_id 1 for calling the TestNiftiEndianness obj's underlying member method code with example usage: obj.setUp() without return types