new_contents: import pytest
  import cv2
  import numpy as np
  from plantcv.plantcv import median_blur
  
  
  @pytest.mark.parametrize("kernel", [5, (5, 5)])
  def test_median_blur(kernel, test_data):
      # Read in test data
      img = cv2.imread(test_data.small_bin_img, -1)
      blur_img = median_blur(gray_img=img, ksize=kernel)
      # Assert that the output image has the dimensions of the input image and is binary
      assert img.shape == blur_img.shape and np.array_equal(np.unique(blur_img), np.array([0, 255]))
  
  
  def test_median_blur_bad_input(test_data):
      # Read in test data
      img = cv2.imread(test_data.small_gray_img, -1)
      with pytest.raises(RuntimeError):
          _ = median_blur(gray_img=img, ksize=5.)
  
subject: Add median_blur tests module