added test for multi.tif

Tests/test_sequence_tiff.py

@@ -0,0 +1,20 @@
+from helper import unittest, PillowTestCase
+
+from PIL import Image, ImageSequence, TiffImagePlugin
+
+TiffImagePlugin.READ_LIBTIFF = True
+
+class TestFileTiff(PillowTestCase):
+
+    def testSequence(self):
+        try:
+            im = Image.open('multi.tif')
+            index = 0
+            for frame in ImageSequence.Iterator(im):
+                frame.load()
+                self.assertEqual(index, im.tell())
+                index = index+1
+        except Exception as e:
+            self.assertTrue(False, str(e))
+            
+