如何在 JMeter 的 Webdriver Sampler 中获取警报消息？

Question

I need to log all alert messages while running JMeter Tests with Webdriver Sampler (and accept the alert boxes). I already tried to take a screenshot and accept the alert, but it didn't work:

try{
    WDS.browser.switchTo().alert();
    WDS.browser.getScreenshotAs(JavaImporter(org.openqa.selenium).OutputType.FILE).renameTo(new java.io.File("output/screenshot.png"));
    WDS.browser.switchTo().alert().accept();
} catch(exception){
    WDS.log.info(exception);
}

Screenshot of Sampler Result

Answer 1

Current version of the WebDriver Sampler is 3.1 which assumes Selenium Support library version 3.14.0

As of Selenium Support library version 3.14.0 you cannot take screenshots (and in fact do anything else) until the alert is present and active, so it means that you cannot take browser screenshot by means of Selenium.

If you do need the screenshot of your page with the alert you can go for Robot.createScreenCapture() function , the alternative code would be something like:

new org.openqa.selenium.support.ui.WebDriverWait(WDS.browser, 2000).until(org.openqa.selenium.support.ui.ExpectedConditions.alertIsPresent())
javax.imageio.ImageIO.write(new java.awt.Robot().createScreenCapture(new java.awt.Rectangle(java.awt.Toolkit.getDefaultToolkit().getScreenSize())), "png", new java.io.File("output/screenshot.png"));
WDS.browser.switchTo().alert().accept()

More information: The WebDriver Sampler: Your Top 10 Questions Answered