* [[http://docs.python.org/lib/module-doctest.html|doctest module]] -- (python standard issue)

doctest.py is a lightweight "literate programming"-style testing framework for python. Released by Tim Peters in 1999 now part of the python standard library.

You define a test by executing some code in an interactive session, and then pasting it along with the output into a nearby docstring. When you run your module at the command-line, doctest executes each one of these code examples, compares the expected and actual output and provides a report.

See also UnitTests


A [[http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/305292|nice example of doctest use]] appears in
the PythonCookBook.
Doctest also appears prominently in 
a 2001 one article titled
"[[http://www.onlamp.com/pub/a/python/2001/05/17/docstrings.html|Python Documentation Tips and Tricks]]".