Doctests work. Really.

1_failing_doctest.diff

diff --git a/nikola/rc4.py b/nikola/rc4.py
index b46d602..e6c0c17 100644
--- a/nikola/rc4.py
+++ b/nikola/rc4.py
@@ -61,6 +61,8 @@ def rc4(key, string):
     """Encrypt things.
     >>> print(rc4("Key", "Plaintext"))
     u/MW6NlArwrT
+    >>> 1 == 0
+    True
     """
 
     string.encode('utf8')

2_py.test.out

$ py.test --doctest-modules nikola/
============================= test session starts ==============================
platform linux -- Python 3.4.3 -- py-1.4.30 -- pytest-2.7.2
rootdir: /home/kwpolska/git/nikola, inifile: 
plugins: cov
collected 10 items 

nikola/post.py .
nikola/rc4.py F
nikola/utils.py ......
nikola/plugins/compile/markdown/mdx_gist.py .
nikola/plugins/task/sitemap/__init__.py .

=================================== FAILURES ===================================
___________________________ [doctest] nikola.rc4.rc4 ___________________________
061     """Encrypt things.
062     >>> print(rc4("Key", "Plaintext"))
063     u/MW6NlArwrT
064     >>> 1 == 0
Expected:
    True
Got:
    False

/home/kwpolska/git/nikola/nikola/rc4.py:64: DocTestFailure
====================== 1 failed, 9 passed in 5.54 seconds ======================