Issue #7701: Fix crash in binascii.b2a_uu() in debug mode when given a
1-byte argument.  Patch by Victor Stinner.
diff --git a/Lib/test/test_binascii.py b/Lib/test/test_binascii.py
index c8fad58..b73f119 100755
--- a/Lib/test/test_binascii.py
+++ b/Lib/test/test_binascii.py
@@ -109,6 +109,9 @@
 
         self.assertRaises(binascii.Error, binascii.b2a_uu, 46*"!")
 
+        # Issue #7701 (crash on a pydebug build)
+        self.assertEqual(binascii.b2a_uu('x'), '!>   \n')
+
     def test_crc32(self):
         crc = binascii.crc32("Test the CRC-32 of")
         crc = binascii.crc32(" this string.", crc)