linux - Selenium 不会刷新 Jenkins 上的页面

Question

我有一个这样的测试用例:

• 打开主页
• 如果没有内容
• 刷新页面
• 继续其他步骤...

这是代码的相关部分:

public JpoPO() {
        driver.get(Settings.JPO_TEST_URL);
        PageFactory.initElements(driver, this);
        System.out.println("[INFO] Homepage initialized.");
        zatvoriModal();
        refreshIfNeeded();
        zatvoriModal();
        (new WebDriverWait(driver, 30)).until(ExpectedConditions.invisibilityOfElementLocated(By.cssSelector("#loading")));
        System.out.println("[DEBUG] broj .ng-scope elemenata: " +driver.findElements(By.cssSelector(".ng-scope")).size());
        System.out.println("[OK] JpoPO() initialized.");
}

这是 refreshIfNeeded() 部分:

public void refreshIfNeeded() {
    if(System.getProperty("os.name").equals("Linux")){
        System.out.println("### A"+now());
        int broj = driver.findElements(By.cssSelector(".ng-scope")).size();
        JavascriptExecutor js = (JavascriptExecutor) driver;
        js.executeScript("location.reload()");
        //driver.findElement(By.cssSelector("header")).sendKeys(Keys.F5);
        driver.get(driver.getCurrentUrl());
        waitForNoSpinner();
        System.out.println("[DEBUG] location reloaded, .ng-scope elements: "+broj);
        System.out.println("### B"+now());
    }else{
        System.out.println("[] Starting refreshIfNeeded()");
        Date ts1 = new Date();
        int count = 0;
        while (driver.findElements(By.cssSelector(".ng-scope")).size()==0 && count < 10){
            driver.navigate().refresh();
            zatvoriModal();
            try {
                (new WebDriverWait(driver, 10)).until(ExpectedConditions.numberOfElementsToBeMoreThan(By.cssSelector(".ng-scope"), 0));
                Date ts2 = new Date();
                long trajanje = ts2.getTime() - ts1.getTime();
                System.out.println(String.format("[INFO] Učitavanje sadržaja: %s ms.", trajanje));
            } catch (Exception e){
                try {
                    Thread.sleep(3000);
                } catch (InterruptedException ex) {
                    ex.printStackTrace();
                }
            }
            System.out.println("[] Count: "+count);
            count++;
        }
    }
}

在我的Windows 机器上本地 运行时一切正常，但是当它在远程 Jenkins linux 机器上运行时刷新没有' 似乎工作。

这是 Jenkins 控制台输出:

16:18:48 [INFO] Homepage initialized.
16:18:48 ### A2019-10-30T16:18:48.904
16:18:49 [INFO] Spinner (ili uvjet čekanja) je trajao: 117 ms. (waitForNoSpinner-try)
16:18:49 [INFO] Spinner (ili uvjet čekanja) je trajao: 89 ms. (waitForNoSpinner-finally)
16:18:49 [DEBUG] location reloaded, .ng-scope elements: 0
16:18:49 ### B2019-10-30T16:18:49.417
16:18:49 [DEBUG] broj .ng-scope elemenata: 0
16:18:49 [OK] JpoPO() initialized.

尝试查找除非刷新页面否则不存在的元素时，测试在以下步骤中失败。这也通过我无法分享的屏幕截图得到了证实。

有多种使用 Selenium here 刷新页面的方法，但没有一种有效。

似乎 js.executeScript("location.reload()") 和 driver.navigate().refresh() 都不起作用。

我正在使用以下 Chromedriver 选项:

if(System.getProperty("os.name").equals("Linux")){
    options.addArguments("--headless");
    options.addArguments("--proxy-server='direct://'");
    options.addArguments("--proxy-bypass-list=*");
    options.addArguments("--window-size=1200,800");
    WebDriverManager.chromedriver().version("77.0.3865.40").setup();
}

编辑:

当我尝试使用 Robot 类刷新时，我会得到一个 java.awt.AWTException: headless environment 所以我添加了 System.setProperty("java.awt.headless", "false"); 到我的代码。

现在我得到一个

java.awt.AWTError: Can't connect to X11 window server using ':0.0' as the value of the DISPLAY variable.

我对 Linux 几乎一无所知，难道这就是原因吗？

Answer 1

您在刷新之前存储 .ng-scope 元素的大小，之后不获取大小。这就是您在日志中得到 0 的原因。您应该搜索 waitForNoSpinner 之后的元素以获取更新大小值:

if(System.getProperty("os.name").equals("Linux")){
    System.out.println("### A"+now());
    int broj = driver.findElements(By.cssSelector(".ng-scope")).size();
    JavascriptExecutor js = (JavascriptExecutor) driver;
    js.executeScript("location.reload()");
    //driver.findElement(By.cssSelector("header")).sendKeys(Keys.F5);
    driver.get(driver.getCurrentUrl());
    waitForNoSpinner();
    broj = wait.until(ExpectedConditions.numberOfElementsToBeMoreThan(By.cssSelector(".ng-scope"), 0)).size();
    System.out.println("[DEBUG] location reloaded, .ng-scope elements: "+ broj);
    System.out.println("### B"+now());
}

这是替代的refreshIfNeeded 方法，其中waitForNoSpinner 和zatvoriModal 基于操作系统。如果 waitForNoSpinner 和 zatvoriModal 之间没有区别，则将 if 替换为其中之一。如果在 20 秒后找不到 .ng-scope，方法将抛出 TimeoutException:

public void refreshIfNeeded() {
    WebDriverWait wait = new WebDriverWait(driver, 20, 1000);

    System.out.println("[DEBUG] check .ng-scope elements and refresh if not located");

    wait.until(d -> {
        if (d.findElements(By.cssSelector(".ng-scope")).isEmpty()) {
            System.out.println("[DEBUG] no .ng-scope elements, refresh..");
            driver.navigate().refresh();
            waitForNoSpinner();
            /*if (System.getProperty("os.name").equals("Linux")) {
                waitForNoSpinner();
            } else {
               zatvoriModal();
            }*/
        }
        return !d.findElements(By.cssSelector(".ng-scope")).isEmpty();
    });

    System.out.println("[DEBUG] .ng-scope elements: " + driver.findElements(By.cssSelector(".ng-scope")).size());
}

带循环:

public void refreshIfNeeded() throws InterruptedException {
    WebDriverWait wait = new WebDriverWait(driver, 20, 1000);

    System.out.println("[DEBUG] check .ng-scope elements and refresh if not located");

    for (int i=0; i < 10; i++) {
        try {
            wait.until(d -> {
                if (d.findElements(By.cssSelector(".ng-scope")).isEmpty()) {
                    System.out.println("[DEBUG] no .ng-scope elements, refresh..");
                    driver.navigate().refresh();
                    if (System.getProperty("os.name").equals("Linux")) {
                        waitForNoSpinner();
                    } else {
                        zatvoriModal();
                    }
                }
                return !d.findElements(By.cssSelector(".ng-scope")).isEmpty();
            });
            break;
        } catch (Exception e) {
            Thread.sleep(3000);
        }
    }
}