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

    old_installed_apps = settings.INSTALLED_APPS
    old_test_database_name = settings.TEST_DATABASE_NAME
    old_root_urlconf = getattr(settings, "ROOT_URLCONF", "")
    old_template_dirs = settings.TEMPLATE_DIRS
    old_use_i18n = settings.USE_I18N
    old_login_url = settings.LOGIN_URL
    old_language_code = settings.LANGUAGE_CODE
    old_middleware_classes = settings.MIDDLEWARE_CLASSES

    # Redirect some settings for the duration of these tests.
    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.LANGUAGE_CODE = 'en'
    settings.LOGIN_URL = '/accounts/login/'
    settings.MIDDLEWARE_CLASSES = (
        'django.contrib.sessions.middleware.SessionMiddleware',
        'django.contrib.auth.middleware.AuthenticationMiddleware',
        'django.middleware.common.CommonMiddleware',
    )
    settings.SITE_ID = 1

    # 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.
    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 test_labels or model_name in set([label.split('.')[0] for label in test_labels]):
                if verbosity >= 1:
                    print "Importing model %s" % model_name
                mod = load_app(model_label)
                if mod:
                    if settings.INSTALLED_APPS not in model_label:
                        settings.INSTALLED_APPS.append(model_label)
        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 test_labels or model_name in test_labels:
            extra_tests.append(InvalidModelTestCase(model_label))
            try:
                # Invalid models are not working apps, so we cannot pass them into
                # the test runner with the other test_labels
                test_labels.remove(model_name)
            except ValueError:
                pass

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

    # Restore the old settings.
    settings.INSTALLED_APPS = old_installed_apps
    settings.ROOT_URLCONF = old_root_urlconf
    settings.TEMPLATE_DIRS = old_template_dirs
    settings.USE_I18N = old_use_i18n
    settings.LANGUAGE_CODE = old_language_code
    settings.LOGIN_URL = old_login_url
    settings.MIDDLEWARE_CLASSES = old_middleware_classes
dataset/ETHPy150Open dcramer/django-compositepks/tests/runtests.py/django_tests/swapped operands of `not in`