code: def test_stream_empty(img_2x2):
      img = img_2x2
      dc = slc.DataContainer((img,), "I")
      stream = slc.Stream()
      res, _, _ = stream(dc, return_torch=False)[0]
      assert np.all(res == img)
  
imports: import itertools
  import random
  import cv2
  import numpy
  import pytest
  import torch
  import solt.core
  import solt.transforms
  import solt.utils
  from .fixtures import *
label_desc: Use image node_id 10 for calling a global function with example usage: test_stream_empty(img_2x2) without return types