// Setup mock configuration with blank webhook URLs
        ComponentUtil.setFessConfig(new MockFessConfig() {
            @Override
            public String getGoogleChatWebhookUrls() {
                return "";
            }
        });

        MockSMailPostingDiscloser discloser = new MockSMailPostingDiscloser();

        // Should return early without doing anything

        // https://developers.google.com/hangouts/chat/how-tos/webhooks
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String googleChatWebhookUrls = fessConfig.getGoogleChatWebhookUrls();
        if (StringUtil.isBlank(googleChatWebhookUrls)) {
            return;
        }
        final String body = toGoogleChatMessage(discloser);

    }

    default void setGoogleChatWebhookUrls(final String value) {
        setSystemProperty(Constants.GOOGLE_CHAT_WEBHOOK_URLS_PROPERTY, value);
    }

    default String getGoogleChatWebhookUrls() {
        return getSystemProperty(Constants.GOOGLE_CHAT_WEBHOOK_URLS_PROPERTY, StringUtil.EMPTY);
    }

    default void setNotificationTo(final String value) {