From 1f8a37841c91e45f48587319e5e14aee9f575fe8 Mon Sep 17 00:00:00 2001
From: Anton Vlasenko <anton.vlasenko@tictail.com>
Date: Fri, 24 Jul 2015 11:14:20 +0200
Subject: [PATCH] Testing that animated gif preserves all important headers

---
 Tests/test_file_gif.py | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Tests/test_file_gif.py b/Tests/test_file_gif.py
index 70438eb03..5c83ba8e4 100644
--- a/Tests/test_file_gif.py
+++ b/Tests/test_file_gif.py
@@ -95,6 +95,21 @@ class TestFileGif(PillowTestCase):
 
         self.assertEqual(reread.n_frames, 5)
 
+    def test_headers_saving_for_animated_gifs(self):
+        important_headers = ['background', 'version', 'transparency', 'duration', 'loop']
+        # Multiframe image
+        im = Image.open("Tests/images/dispose_bgnd.gif")
+
+        out = self.tempfile('temp.gif')
+        im.save(out, save_all=True)
+        reread = Image.open(out)
+
+        for header in important_headers:
+            self.assertEqual(
+                im.info[header],
+                reread.info[header]
+            )
+
     def test_palette_handling(self):
         # see https://github.com/python-pillow/Pillow/issues/513