SF patch #1056967, changes the semantics of Template.safe_substitute() to not
raise a ValueError for dangling delimiters (the delimiter itself is returned).
diff --git a/Lib/test/test_pep292.py b/Lib/test/test_pep292.py
index 19952e4..2a4353a 100644
--- a/Lib/test/test_pep292.py
+++ b/Lib/test/test_pep292.py
@@ -163,20 +163,19 @@
         raises(TypeError, s.safe_substitute, d, {})
 
     def test_delimiter_override(self):
+        eq = self.assertEqual
+        raises = self.assertRaises
         class AmpersandTemplate(Template):
             delimiter = '&'
         s = AmpersandTemplate('this &gift is for &{who} &&')
-        self.assertEqual(s.substitute(gift='bud', who='you'),
-                         'this bud is for you &')
-        self.assertRaises(KeyError, s.substitute)
-        self.assertEqual(s.safe_substitute(gift='bud', who='you'),
-                         'this bud is for you &')
-        self.assertEqual(s.safe_substitute(),
-                         'this &gift is for &{who} &')
+        eq(s.substitute(gift='bud', who='you'), 'this bud is for you &')
+        raises(KeyError, s.substitute)
+        eq(s.safe_substitute(gift='bud', who='you'), 'this bud is for you &')
+        eq(s.safe_substitute(), 'this &gift is for &{who} &')
         s = AmpersandTemplate('this &gift is for &{who} &')
-        self.assertRaises(ValueError, s.substitute,
-                          dict(gift='bud', who='you'))
-        self.assertRaises(ValueError, s.safe_substitute)
+        raises(ValueError, s.substitute, dict(gift='bud', who='you'))
+        eq(s.safe_substitute(), 'this &gift is for &{who} &')
+
 
 def test_main():
     from test import test_support