code: def test_gray2hsv():
      cv_gray = cv.imread(tens_path)
      cv_gray = cv.cvtColor(cv_gray, cv.COLOR_BGR2GRAY)
      cv_gray = caer.to_tensor(cv_gray, cspace="gray")
  
      hsv = caer.gray2hsv(cv_gray)
  
      assert len(hsv.shape) == 3
      assert isinstance(hsv, caer.Tensor)
      assert hsv.is_hsv()
  
file_path: caer/tests/color/test_gray.py
imports: import caer
  import cv2
  import os
label_desc: Use image node_id 3 for calling a global function with example usage: test_gray2hsv() without return types