code: def test_iter(test_images, tmp_path):
      img_expected = iio.imread(test_images / "newtonscradle.gif")
      iio.imwrite(tmp_path / "test.tiff", img_expected)
  
      for idx, img in enumerate(
          iio.imiter(tmp_path / "test.tiff", plugin="opencv")
      ):
          assert img.shape == (150, 200, 3)
          np.allclose(img, img_expected[idx])
  
file_path: imageio/tests/test_opencv.py
imports: import warnings
  import imageio.v3
  import numpy
  import pytest
  import cv2
label_desc: Use image node_id 4 for calling a global function with example usage: test_iter(test_images, tmp_path) without return types