def METHOD_NAME(self) -> None:
    def mock_run_cmd(unused_cmd: str) -> str:
        return (
            'scripts/setup.py\nextensions/test.ts\n'
            'core/storage/activity/gae_models.py\n'
            'core/storage/user/gae_models.py')
    with self.swap(common, 'run_cmd', mock_run_cmd):
        actual_storgae_models = (
            repo_specific_changes_fetcher
            .get_changed_storage_models_filenames('release_tag'))
    expected_storage_models = [
        'core/storage/activity/gae_models.py',
        'core/storage/user/gae_models.py']
    self.assertEqual(actual_storgae_models, expected_storage_models)