Index: Lib/test/test_difflib.py
===================================================================
--- Lib/test/test_difflib.py	(revision 54269)
+++ Lib/test/test_difflib.py	(working copy)
@@ -150,6 +150,15 @@
         old = [(i%2 and "K:%d" or "V:A:%d") % i for i in range(limit*2)]
         new = [(i%2 and "K:%d" or "V:B:%d") % i for i in range(limit*2)]
         difflib.SequenceMatcher(None, old, new).get_opcodes()
+    
+    def test_find_longest_match(self):
+        # Check if the problem described in bug #1528074 exists.
+	for i in (190, 200, 210):
+            text1 = "a" + "b"*i
+            text2 = "b"*i + "c"
+            m = difflib.SequenceMatcher(None, text1, text2)
+            (aptr,bptr,l) = m.find_longest_match(0, len(text1), 0, len(text2))
+	    assert i == l
+	    assert aptr == 1
+	    assert bptr == 0
 
 
 def test_main():