fix doctest on Python 3.6

src/keas/kmi/persistent.txt

@@ -152,7 +152,7 @@ error:
     >>> pwd.password
     Traceback (most recent call last):
       ...
-    ValueError: need more than 1 value to unpack
+    ValueError: not enough values to unpack (expected 2, got 1)
 
 But we can apply the conversion step:
 

src/keas/kmi/tests.py

@@ -14,12 +14,14 @@
 """Test Setup
 """
 import doctest
+import re
 import tempfile
 import transaction
 import unittest
 
 from zope.app.testing import setup
 from zope.component import provideUtility
+from zope.testing.renormalizing import RENormalizing
 
 from keas.kmi.testing import TestingKeyManagementFacility
 from keas.kmi.interfaces import IKeyManagementFacility
@@ -39,6 +41,11 @@ def tearDownPersistent(test):
 
 
 def test_suite():
+    checker = RENormalizing([
+        # fix doctest for ValueError exception on Python < 3.6
+        (re.compile(r"ValueError: need more than 1 value to unpack"),
+         "ValueError: not enough values to unpack (expected 2, got 1)")
+    ])
     return unittest.TestSuite([
         doctest.DocFileSuite(
             'README.txt',
@@ -49,5 +56,6 @@ def test_suite():
         doctest.DocFileSuite(
             'persistent.txt',
             setUp=setUpPersistent, tearDown=tearDownPersistent,
-            optionflags=doctest.NORMALIZE_WHITESPACE|doctest.ELLIPSIS),
+            optionflags=doctest.NORMALIZE_WHITESPACE|doctest.ELLIPSIS,
+            checker=checker),
     ])