Use mock.patch for loading strategy test

Author: benkonrath

easy_thumbnails/tests/test_animated_formats.py

@@ -1,7 +1,7 @@
 from io import BytesIO
 from PIL import Image, ImageDraw, GifImagePlugin
 from easy_thumbnails import processors
-from unittest import TestCase
+from unittest import TestCase, mock
 
 from easy_thumbnails.files import get_thumbnailer
 
@@ -93,18 +93,13 @@ def test_gif_with_mode_p(self):
             thumbnail = t.get_thumbnail({'size': (500, 50), 'crop': True})
             self.assertTrue(thumbnail.image.is_animated)
 
+    @mock.patch("PIL.GifImagePlugin.LOADING_STRATEGY", GifImagePlugin.LoadingStrategy.RGB_ALWAYS)
     def test_gif_with_mode_p__gif_plug_loading_strategy_rgb_always(self):
+        print("m",GifImagePlugin.LOADING_STRATEGY)
         image_path = "easy_thumbnails/tests/files/animated_mode_p.gif"
-        default_loading_strategy = GifImagePlugin.LOADING_STRATEGY
-        try:
-            GifImagePlugin.LOADING_STRATEGY = GifImagePlugin.LoadingStrategy.RGB_ALWAYS
-            with open(image_path, "rb") as im:
-                t = get_thumbnailer(im, image_path)
-                # Should not fail because of wrong mode and should still be animated.
-                # https://github.com/SmileyChris/easy-thumbnails/issues/653
-                thumbnail = t.get_thumbnail({'size': (500, 50), 'crop': True})
-                self.assertTrue(thumbnail.image.is_animated)
-        except Exception:
-            GifImagePlugin.LOADING_STRATEGY = default_loading_strategy
-            raise
-        GifImagePlugin.LOADING_STRATEGY = default_loading_strategy
+        with open(image_path, "rb") as im:
+            t = get_thumbnailer(im, image_path)
+            # Should not fail because of wrong mode and should still be animated.
+            # https://github.com/SmileyChris/easy-thumbnails/issues/653
+            thumbnail = t.get_thumbnail({'size': (500, 50), 'crop': True})
+            self.assertTrue(thumbnail.image.is_animated)