#!/usr/bin/env python

"""
app/ -> libs/
     -> tests/
     -> test

libs/ -> __init__.py
      -> foo.py

tests/ -> __init__.py
       -> foo.py

tests/foo.py contents: import libs.foo
"""

# app/test:

import sys
import os
import unittest

def run_tests():
    tests = sys.argv[1:]
    formatted = lambda s: s
    if not tests:
        tests = os.listdir('tests')
        formatted = lambda s: os.path.splitext(s)[0]

    tests = ['tests.%s' % formatted(test) for test in tests]
    tests = map(__import__, tests)
    load = unittest.defaultTestLoader.loadTestsFromModule

    return unittest.TestSuite(map(load, tests))

if __name__ == '__main__':
    try:
        unittest.main(defaultTest='run_tests')
    except AttributeError:
        print 'nonexistent test names'

"""
$ ./test foo
Gives me 'nonexistent test names'.

But if I call run_tests() manually, instead of unittest.main(defaultTest='run_tests')
the same command ($ ./test foo) works without raising any exception, not an AttributeError,
but not even an ImportError.
"""