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+import cv2%0Afrom plantcv.plantcv import stdev_filter%0A%0A%0Adef test_stdev_filter(test_data):%0A    # Read in test data%0A    img = cv2.imread(test_data.small_gray_img, -1)%0A    filter_img = stdev_filter(img=img, ksize=11)%0A    assert img.shape == filter_img.shape%0A

Add stdev_filter tests module