Python: How to run unittest.main() for all source files in a subdirectory?

Question

I am developing a Python module with several source files, each with its own test class derived from unittest right in the source. Consider the directory structure:

Answer 1

I came up with a snippet that may do what you want. It walks a path that you provide looking for Python packages/modules and accumulates a set of test suites from those modules, which it then executes all at once.

The nice thing about this is that it will work on all packages nested under the directory you specify, and you won't have to manually change the imports as you add new components.

import logging
import os
import unittest

MODULE_EXTENSIONS = set('.py .pyc .pyo'.split())

def unit_test_extractor(tup, path, filenames):
    """Pull ``unittest.TestSuite``s from modules in path
    if the path represents a valid Python package. Accumulate
    results in `tup[1]`.
    """
    package_path, suites = tup
    logging.debug('Path: %s', path)
    logging.debug('Filenames: %s', filenames)
    relpath = os.path.relpath(path, package_path)
    relpath_pieces = relpath.split(os.sep)

    if relpath_pieces[0] == '.': # Base directory.
        relpath_pieces.pop(0) # Otherwise, screws up module name.
    elif not any(os.path.exists(os.path.join(path, '__init__' + ext))
            for ext in MODULE_EXTENSIONS):
        return # Not a package directory and not the base directory, reject.

    logging.info('Base: %s', '.'.join(relpath_pieces))
    for filename in filenames:
        base, ext = os.path.splitext(filename)
        if ext not in MODULE_EXTENSIONS: # Not a Python module.
            continue
        logging.info('Module: %s', base)
        module_name = '.'.join(relpath_pieces + [base])
        logging.info('Importing from %s', module_name)
        module = __import__(module_name)
        module_suites = unittest.defaultTestLoader.loadTestsFromModule(module)
        logging.info('Got suites: %s', module_suites)
        suites += module_suites

def get_test_suites(path):
    """:return: Iterable of suites for the packages/modules
    present under :param:`path`.
    """
    logging.info('Base path: %s', package_path)
    suites = []
    os.path.walk(package_path, unit_test_extractor, (package_path, suites))
    logging.info('Got suites: %s', suites)
    return suites

if __name__ == '__main__':
    logging.basicConfig(level=logging.WARN)
    package_path = os.path.dirname(os.path.abspath(__file__))
    suites = get_test_suites(package_path)
    for suite in suites:
        unittest.TextTestRunner(verbosity=2).run(suite)