MATLAB's 2013b release brings functiontests, the first testing framework for MATLAB. Its highlights are outlined in a blog post by Loren, http://blogs.mathworks.com/loren/2013/10/15/function-is-as-functiontests/?s_eid=PSM_5863.

Python's unittest.py framework was part of its 2.1 release in 2001 and has since developed into a powerful yet simple toolkit for developing reliable code. This repository uses unittest.py to reproduces Loren's ODE problem with some simple tests in Python. Watch the magic unfold in about 20 lines of code.