Fix dir issues in comparing images

Author: forsyth2

tests/integration/utils.py

@@ -62,13 +62,17 @@ def compare_images(
 
             mismatched_images.append(image_name)
 
+            actual_dir = os.path.join(diff_dir, "{}_actual.png".format(image_name))
+            os.makedirs(os.path.dirname(actual_dir), exist_ok=True)
             shutil.copy(
                 path_to_actual_png,
-                os.path.join(diff_dir, "{}_actual.png".format(image_name)),
+                actual_dir,
             )
+            expected_dir = os.path.join(diff_dir, "{}_expected.png".format(image_name))
+            os.makedirs(os.path.dirname(expected_dir), exist_ok=True)
             shutil.copy(
                 path_to_expected_png,
-                os.path.join(diff_dir, "{}_expected.png".format(image_name)),
+                expected_dir,
             )
             # https://stackoverflow.com/questions/41405632/draw-a-rectangle-and-a-text-in-it-using-pil
             draw = ImageDraw.Draw(diff)