sklearn.test() does not like doctest that don't print.

Fabian Pedregosa · Fabian Pedregosa · commit 00cc4852466a · 2011-09-19T23:30:54.000+02:00
Put a simple statement in deprecated's docstring.
diff --git a/sklearn/utils/__init__.py b/sklearn/utils/__init__.py
@@ -167,6 +167,9 @@ class deprecated(object):
     in an empty of parentheses:
 
     >>> from sklearn.utils import deprecated
+    >>> deprecated() # doctest: +ELLIPSIS
+    <sklearn.utils.deprecated object at ...>
+
     >>> @deprecated()
     ... def some_function(): pass
 
