Test pipes.quote with a few non-ASCII characters (see #9723).

That pipes.quote thinks all non-ASCII characters need to be quoted may
be a bug, but right now I’m committing this test to make sure I haven’t
introduced a behavior change in 3.3 when I simplified the code to use a
regex (in 5966eeb0457d).

Lib/test/test_pipes.py

@@ -81,7 +81,8 @@ class SimplePipeTests(unittest.TestCase):
 
     def testQuoting(self):
         safeunquoted = string.ascii_letters + string.digits + '@%_-+=:,./'
-        unsafe = '"`$\\!'
+        unicode_sample = '\xe9\xe0\xdf'  # e + acute accent, a + grave, sharp s
+        unsafe = '"`$\\!' + unicode_sample
 
         self.assertEqual(pipes.quote(''), "''")
         self.assertEqual(pipes.quote(safeunquoted), safeunquoted)