unittest.TestCase.assertDictEqual and assertMultilineEqual provide better default failure messages in the event of long diffs.
diff --git a/Lib/unittest/util.py b/Lib/unittest/util.py
index 7d90ddf..d201657 100644
--- a/Lib/unittest/util.py
+++ b/Lib/unittest/util.py
@@ -2,12 +2,16 @@
__unittest = True
-
-def safe_repr(obj):
+_MAX_LENGTH = 80
+def safe_repr(obj, short=False):
try:
- return repr(obj)
+ result = repr(obj)
except Exception:
- return object.__repr__(obj)
+ result = object.__repr__(obj)
+ if not short or len(result) < _MAX_LENGTH:
+ return result
+ return result[:_MAX_LENGTH] + ' [truncated]...'
+
def strclass(cls):
return "%s.%s" % (cls.__module__, cls.__name__)