static String buildUserPreferenceConfigMapName(String username) {
        return "user-preferences-" + username;
    }
@Test
    void buildUserPreferenceConfigMapName() {
        var preferenceConfigMapName = UserNotificationPreferenceServiceImpl
            .buildUserPreferenceConfigMapName("guqing");
        assertEquals("user-preferences-guqing", preferenceConfigMapName);
    }