little description of regression and refactor

test/refactor.py

@@ -1,4 +1,8 @@
 #!/usr/bin/env python
+"""
+Refactoring tests work a little bit similar to Black Box tests. But the idea is
+here to compare two versions of code.
+"""
 from __future__ import with_statement
 import sys
 import os

test/regression.py

@@ -1,4 +1,9 @@
 #!/usr/bin/env python
+"""
+Unit tests to avoid errors of the past. Makes use of Python's ``unittest``
+module.
+"""
+
 # -*- coding: utf-8 -*-
 import unittest
 import time