code: def test_bgr2luv():
      cv_bgr = cv.imread(tens_path)
      cv_bgr = caer.to_tensor(cv_bgr, cspace="bgr")
      luv = caer.bgr2luv(cv_bgr)
  
      assert len(luv.shape) == 3
      assert isinstance(luv, caer.Tensor)
      assert luv.is_luv()
  
file_path: caer/tests/color/test_bgr.py
imports: import caer
  import cv2
  import os
label_desc: Use image node_id 7 for calling a global function with example usage: test_bgr2luv() without return types