def load_custom_test_package(self, module, app_name):

        for importer, module_name, ispkg in pkgutil.iter_modules(
                                [os.path.dirname(module.__file__)]):
            try:
                import_module('.'.join([app_name, 'tests']))
            except ImportError, e:
                pass
            else:
                module = import_module('.'.join([app_name, 'tests',
                                             module_name]))
                yield defaultTestLoader.loadTestsFromModule(module)
Load custom test package from module and app
dataset/ETHPy150Open plus500s/django-test-tools/test_tools/test_runner.py/DiscoveryDjangoTestSuiteRunner.load_custom_test_package