我正在嘗試為我的服務編寫一個測試，該測試與另一個從數據庫返回項目的服務建立連接。我的問題是我在測試中設置了連接屬性并啟動了服務。這怎么可能是模擬或類似的？我的啟動服務方法：public void doStartService() {        super.doStartService();        PoolingHttpClientConnectionManager manager = new PoolingHttpClientConnectionManager();        manager.setDefaultMaxPerRoute(maxConnectionsPerRoute);        manager.setMaxTotal(maxConnections);        RequestConfig requestConfig = RequestConfig.custom()                .setConnectTimeout(connectTimeout)                .setSocketTimeout(socketTimeout)                .setRedirectsEnabled(false).build();        HttpClientBuilder builder = HttpClientBuilder.create();        builder.setDefaultRequestConfig(requestConfig);        builder.setConnectionManager(manager);        client = builder.build();    }我的設置測試方法和一種測試方法：private ProductCatalogIntegrationService service; @Before    public void setup() {        service = new Service();        service.setConnectTimeout(10000);        service.setSocketTimeout(10000);        service.setMaxConnections(10);        service.setMaxConnectionsPerRoute(10);        service.setUrl("http://localhost:8888/products");        service.doStartService();    }    @Test    public void testReturnProductById() {        service.setProductById(GET_PRODUCT_BY_ID); // set url from get product by id, by this url my other service goes to the database        jsonItem = service.getProductById("1"); //get product by id 1        assertEquals(jsonItem.getId(), FIRST_PRODUCT_ID); // I compare the id on which I made the request to the database, so that I came and was wrapped in a class wrapper    }如何正確執行，以免在測試中配置連接？