code: def test_metadata(test_images):
      with warnings.catch_warnings(record=True):
          metadata = iio.immeta(
              test_images / "astronaut.png", plugin="opencv"
          )
  
      assert metadata == dict()
  
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 9 for calling a global function with example usage: test_metadata(test_images) without return types