You could use a test runner that would do this for you. nose is very good for example. When run, it will find tests in the current tree and run them.
Updated:
Here's some code from my pre-nose days. You probably don't want the explicit list of module names, but maybe the rest will be useful to you.
testmodules = [ 'cogapp.test_makefiles', 'cogapp.test_whiteutils', 'cogapp.test_cogapp', ] suite = unittest.TestSuite() for t in testmodules: try: # If the module defines a suite() function, call it to get the suite. mod = __import__(t, globals(), locals(), ['suite']) suitefn = getattr(mod, 'suite') suite.addTest(suitefn()) except (ImportError, AttributeError): # else, just load all the test cases from the module. suite.addTest(unittest.defaultTestLoader.loadTestsFromName(t)) unittest.TextTestRunner().run(suite)