LP #142563: Fix AccessControl.User.NullUnrestrictedUserTests.__str__.

doc/CHANGES.rst

@@ -44,6 +44,8 @@ Features Added
 Bugs Fixed
 ++++++++++
 
+- LP #142563:  Fix ``AccessControl.User.NullUnrestrictedUserTests.__str__``.
+
 - Fix several template errors in SiteErrorLog (chameleon compatibility).
 
 - LP #267820:  Fix bad except clause in the ``sequence_sort`` method of

src/AccessControl/User.py

@@ -400,6 +400,9 @@ class NullUnrestrictedUser(SpecialUser):
     def has_permission(self, permission, object):
         return 0
 
+    def __str__(self):
+        # See https://bugs.launchpad.net/zope2/+bug/142563
+        return repr(self)
 
 
 def readUserAccessFile(filename):

src/AccessControl/tests/testUser.py

@@ -205,6 +205,11 @@ class NullUnrestrictedUserTests(unittest.TestCase):
         null = self._makeOne()
         self.assertEqual(repr(null), "<NullUnrestrictedUser (None, None)>")
 
+    def test___str__(self):
+        # See https://bugs.launchpad.net/zope2/+bug/142563
+        null = self._makeOne()
+        self.assertEqual(str(null), "<NullUnrestrictedUser (None, None)>")
+
 
 class UserTests(unittest.TestCase):