Doctest is horrible.

jsonschema.py

@@ -459,7 +459,7 @@ class FormatChecker(object):
                                 can be used to limit which formats will be used
                                 during validation.
 
-        >>> checker = FormatChecker(formats=("uri", "regex"))
+        >>> checker = FormatChecker(formats=("date", "regex"))
 
     """
 

tox.ini

@@ -19,6 +19,10 @@ commands =
     sphinx-build -W -b html -d {envtmpdir}/doctrees . {envtmpdir}/html
 
 [testenv:py26]
+commands =
+    nosetests -s tests.py
+    {envpython} -m doctest README.rst
+    {envpython} -m doctest jsonschema.py
 deps =
     {[testenv:notpy33]deps}
     {[testenv:all]deps}