def django_tests(verbosity, tests_to_run):
    from django.conf import settings

    old_installed_apps = settings.INSTALLED_APPS
    old_test_database_name = settings.TEST_DATABASE_NAME
    old_root_urlconf = settings.ROOT_URLCONF
    old_template_dirs = settings.TEMPLATE_DIRS
    old_use_i18n = settings.USE_I18N
    old_middleware_classes = settings.MIDDLEWARE_CLASSES

    # Redirect some settings for the duration of these tests.
    settings.TEST_DATABASE_NAME = TEST_DATABASE_NAME
    settings.INSTALLED_APPS = ALWAYS_INSTALLED_APPS
    settings.ROOT_URLCONF = 'urls'
    settings.TEMPLATE_DIRS = (os.path.join(os.path.dirname(__file__), TEST_TEMPLATE_DIR),)
    settings.USE_I18N = True
    settings.MIDDLEWARE_CLASSES = (
        'django.contrib.sessions.middleware.SessionMiddleware',
        'django.contrib.auth.middleware.AuthenticationMiddleware',
        'django.middleware.common.CommonMiddleware',
    )

    # Load all the ALWAYS_INSTALLED_APPS.
    # (This import statement is intentionally delayed until after we
    # access settings because of the USE_I18N dependency.)
    from django.db.models.loading import get_apps, load_app
    get_apps()

    # Load all the test model apps.
    test_models = []
    for model_dir, model_name in get_test_models():
        model_label = '.'.join([model_dir, model_name])
        try:
            # if the model was named on the command line, or
            # no models were named (i.e., run all), import
            # this model and add it to the list to test.
            if not tests_to_run or model_name in tests_to_run:
                if verbosity >= 1:
                    print "Importing model %s" % model_name
                mod = load_app(model_label)
                settings.INSTALLED_APPS.append(model_label)
                test_models.append(mod)
        except Exception, e:
            sys.stderr.write("Error while importing %s:" % model_name + ''.join(traceback.format_exception(*sys.exc_info())[1:]))
            continue

    # Add tests for invalid models.
    extra_tests = []
    for model_dir, model_name in get_invalid_models():
        model_label = '.'.join([model_dir, model_name])
        if not tests_to_run or model_name in tests_to_run:
            extra_tests.append(InvalidModelTestCase(model_label))

    # Run the test suite, including the extra validation tests.
    from django.test.simple import run_tests
    failures = run_tests(test_models, verbosity, extra_tests=extra_tests)
    if failures:
        sys.exit(failures)

    # Restore the old settings.
    settings.INSTALLED_APPS = old_installed_apps
    settings.TESTS_DATABASE_NAME = old_test_database_name
    settings.ROOT_URLCONF = old_root_urlconf
    settings.TEMPLATE_DIRS = old_template_dirs
    settings.USE_I18N = old_use_i18n
    settings.MIDDLEWARE_CLASSES = old_middleware_classes
dataset/ETHPy150Open CollabQ/CollabQ/.google_appengine/lib/django/tests/runtests.py/django_tests/original