[tests] enable doctest for Revision

Change-Id: Idc6b7fd0a2564a94dc2a39e38a45252f904bbf15
---
M pywikibot/page/_revision.py
M tox.ini
2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/pywikibot/page/_revision.py b/pywikibot/page/_revision.py
index efd8cef..5fb552f 100644
--- a/pywikibot/page/_revision.py
+++ b/pywikibot/page/_revision.py
@@ -7,6 +7,7 @@
 import hashlib
 
 from collections.abc import Mapping
+from contextlib import suppress
 
 from pywikibot import Timestamp, warning
 from pywikibot.tools import deprecated
@@ -23,7 +24,7 @@
     >>> r.comment == r['comment']
     True
     >>> r.comment
-    Sample for Revision access
+    'Sample for Revision access'
     """
 
     def __init__(self, **kwargs):
@@ -35,7 +36,8 @@
     @staticmethod
     def _upcast_dict(map_):
         """Upcast dictionary values."""
-        map_['timestamp'] = Timestamp.fromISOformat(map_['timestamp'])
+        with suppress(KeyError):  # enable doctest
+            map_['timestamp'] = Timestamp.fromISOformat(map_['timestamp'])
 
         map_.update(anon='anon' in map_)
         map_.update(minor='minor' in map_)
diff --git a/tox.ini b/tox.ini
index 13cc35a..a9b7962 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,7 +8,7 @@
     flake8-{py35,py36}
 
 [params]
-doctest_skip = --ignore-files=(_revision|eventstreams|gui|mysql)\.py
+doctest_skip = --ignore-files=(eventstreams|gui|mysql)\.py
 generate_user_files = -W error::UserWarning -m generate_user_files -family:wikipedia -lang:test -v
 
 [testenv]

