Java 我能'；t从测试类的对话框警报中获取文本

早上好， 我正在为一个javafx类做一个测试类，我现在正试图控制错误。当发生错误时，向我显示一个对话框警报，其中包含解释错误的消息。我想将此消息与测试类中的其他消息进行比较。
这是我最后一次尝试。

登录类

catch (ServerConnectionErrorException ex) {
            LOGGER.warning("LoginWindowController: Server connection error");
            Alert alert = new Alert(Alert.AlertType.ERROR);
            alert.setTitle("Server Error");
            alert.setContentText("Unable to connect with server");
            Label serverErrorContext = new Label();
            serverErrorContext.setText(alert.getContentText());
            serverErrorContext.setId("serverErrorContext");
            alert.showAndWait();
        }

@Test
    public void test4_ConnectionError(){
        clickOn("#txtLogin");
        write("user");
        clickOn("#txtPass");
        write("BBccd1234");
        clickOn("#btLogin");
        FxAssert.verifyThat("#serverErrorContext",LabeledMatchers.hasText("Unable to connect with server"));
        clickOn(".button");

    }

Alert alert = new Alert(Alert.AlertType.ERROR);
            alert.setTitle("Server Error");
            alert.setContentText("Unable to connect with server");
            Button errorButton = (Button) alert.getDialogPane().lookupButton(ButtonType.OK);
            errorButton.setId("serverConnectionError");
            alert.showAndWait();

clickOn("#txtLogin");
        write("user");
        clickOn("#txtPass");
        write("BBccd1234");
        clickOn("#btLogin");
        FxAssert.verifyThat("#serverConnectionError",isEnabled());
        clickOn("#serverConnectionError");

测试类

catch (ServerConnectionErrorException ex) {
            LOGGER.warning("LoginWindowController: Server connection error");
            Alert alert = new Alert(Alert.AlertType.ERROR);
            alert.setTitle("Server Error");
            alert.setContentText("Unable to connect with server");
            Label serverErrorContext = new Label();
            serverErrorContext.setText(alert.getContentText());
            serverErrorContext.setId("serverErrorContext");
            alert.showAndWait();
        }

@Test
    public void test4_ConnectionError(){
        clickOn("#txtLogin");
        write("user");
        clickOn("#txtPass");
        write("BBccd1234");
        clickOn("#btLogin");
        FxAssert.verifyThat("#serverErrorContext",LabeledMatchers.hasText("Unable to connect with server"));
        clickOn(".button");

    }

Alert alert = new Alert(Alert.AlertType.ERROR);
            alert.setTitle("Server Error");
            alert.setContentText("Unable to connect with server");
            Button errorButton = (Button) alert.getDialogPane().lookupButton(ButtonType.OK);
            errorButton.setId("serverConnectionError");
            alert.showAndWait();

clickOn("#txtLogin");
        write("user");
        clickOn("#txtPass");
        write("BBccd1234");
        clickOn("#btLogin");
        FxAssert.verifyThat("#serverConnectionError",isEnabled());
        clickOn("#serverConnectionError");

---

最后一个检查contentText是否与应该显示的消息相同的实例，我决定为每个警报声明一个按钮并为其分配一个id。每个id都是唯一的，因此机器人不可能单击其他按钮，如果allert没有正确显示，则测试可能是错误的。
主类

catch (ServerConnectionErrorException ex) {
            LOGGER.warning("LoginWindowController: Server connection error");
            Alert alert = new Alert(Alert.AlertType.ERROR);
            alert.setTitle("Server Error");
            alert.setContentText("Unable to connect with server");
            Label serverErrorContext = new Label();
            serverErrorContext.setText(alert.getContentText());
            serverErrorContext.setId("serverErrorContext");
            alert.showAndWait();
        }

@Test
    public void test4_ConnectionError(){
        clickOn("#txtLogin");
        write("user");
        clickOn("#txtPass");
        write("BBccd1234");
        clickOn("#btLogin");
        FxAssert.verifyThat("#serverErrorContext",LabeledMatchers.hasText("Unable to connect with server"));
        clickOn(".button");

    }

Alert alert = new Alert(Alert.AlertType.ERROR);
            alert.setTitle("Server Error");
            alert.setContentText("Unable to connect with server");
            Button errorButton = (Button) alert.getDialogPane().lookupButton(ButtonType.OK);
            errorButton.setId("serverConnectionError");
            alert.showAndWait();

clickOn("#txtLogin");
        write("user");
        clickOn("#txtPass");
        write("BBccd1234");
        clickOn("#btLogin");
        FxAssert.verifyThat("#serverConnectionError",isEnabled());
        clickOn("#serverConnectionError");

测试类

catch (ServerConnectionErrorException ex) {
            LOGGER.warning("LoginWindowController: Server connection error");
            Alert alert = new Alert(Alert.AlertType.ERROR);
            alert.setTitle("Server Error");
            alert.setContentText("Unable to connect with server");
            Label serverErrorContext = new Label();
            serverErrorContext.setText(alert.getContentText());
            serverErrorContext.setId("serverErrorContext");
            alert.showAndWait();
        }

@Test
    public void test4_ConnectionError(){
        clickOn("#txtLogin");
        write("user");
        clickOn("#txtPass");
        write("BBccd1234");
        clickOn("#btLogin");
        FxAssert.verifyThat("#serverErrorContext",LabeledMatchers.hasText("Unable to connect with server"));
        clickOn(".button");

    }

Alert alert = new Alert(Alert.AlertType.ERROR);
            alert.setTitle("Server Error");
            alert.setContentText("Unable to connect with server");
            Button errorButton = (Button) alert.getDialogPane().lookupButton(ButtonType.OK);
            errorButton.setId("serverConnectionError");
            alert.showAndWait();

clickOn("#txtLogin");
        write("user");
        clickOn("#txtPass");
        write("BBccd1234");
        clickOn("#btLogin");
        FxAssert.verifyThat("#serverConnectionError",isEnabled());
        clickOn("#serverConnectionError");

---

不清楚你在问什么。请提供一个。@hotzst验证显示的警报是否收到了正确的错误消息，例如，如果我尝试连接到服务器但无法建立连接，则应显示服务器错误。例如，请检查这是服务器错误，而不是用户名错误