带有Katalon和Chrome无头模式的截图

Question

从堆栈溢出复制/重发：

https://stackoverflow.com/questions/51168671/screenshot-with-katalon-and-chrome-headless-mode。

我使用以下代码在Katalon Studio脚本中获取警告和错误消息的屏幕截图：

import ru.yandex.qatools.ashot.AShot
import ru.yandex.qatools.ashot.Screenshot
import ru.yandex.qatools.ashot.coordinates.*
import ru.yandex.qatools.ashot.cropper.*

public class ScreenshotHelper {


  public void takeWebElementScreenshot(TestObject object) {
    WebElement element = WebUiCommonHelper.findWebElement(object, 20)
    WebDriver driver = DriverFactory.getWebDriver();
    String fileName = new SimpleDateFormat("yyyyMMddHHmmSSS").format(new Date())
    Screenshot screenshot = new AShot().takeScreenshot(driver, element)
    ImageIO.write(screenshot.getImage(),'PNG', new File(System.getProperty("user.dir")+"/ErrorScreenshots/ElementScreenshot"+"_"+fileName+".png"))
  }
}

从同一个类的另一个方法调用此方法：

public void catchNotyMessage(){

TestObject noty_warning = WebUI.modifyObjectProperty(findTestObject("DUMMY"), 'css', 'equals', 'div.noty_type_warning', true)
TestObject noty_error = WebUI.modifyObjectProperty(findTestObject("DUMMY"), 'css', 'equals', 'div.noty_type_error', true)

    if (WebUI.verifyElementPresent(noty_error, 1, FailureHandling.OPTIONAL)){
        this.takeWebElementScreenshot(noty_error)
    }
    else if (WebUI.verifyElementPresent(noty_warning, 1, FailureHandling.OPTIONAL)){
        this.takeWebElementScreenshot(noty_warning)
    }
}

它工作得很好，截图是在正常模式下使用Katalon时拍摄的。

但是，当我以无头模式运行脚本时，会收到以下警告：

WARNING com.kms.katalon.core.webui.exception.WebElementNotFoundException: Web element with id: 'Object Repository/DUMMY' located by 'By.cssSelector: div.noty_type_error' not found

即使元素应该存在。java.lang.NullPointerException测试失败。

是因为无头处决吗？如果是这样，我怎样才能解决这个问题呢？

Answer 1

看过之后

• https://docs.oracle.com/javase/tutorial/2d/images/saveimage.html
• https://stackoverflow.com/questions/19871955/java-io-filenotfoundexception-the-system-cannot-find-the-file-specified
• https://stackoverflow.com/questions/47600505/chrome-headless-doesnt-work
• https://stackoverflow.com/questions/16239130/java-user-dir-property-what-exactly-does-it-mean，我终于弄明白了。

问题是，当测试在无头模式下通过命令行执行时，System.getProperty("user.dir")会发生变化。因此，此代码工作如下：

    public void takeWebElementScreenshot(TestObject object) {
    WebElement element = WebUiCommonHelper.findWebElement(object, 20)
    WebDriver driver = DriverFactory.getWebDriver();
    String fileName = new SimpleDateFormat("yyyyMMddHHmmSSS").format(new Date())
    Screenshot screenshot = new AShot().takeScreenshot(driver, element)
    try {
        if (DriverFactory.getExecutedBrowser().getName()=='HEADLESS_DRIVER'){
            ImageIO.write(screenshot.getImage(),'PNG', new File("C:/Users/path_to_working_directory/ErrorScreenshots/HeadlessElementScreenshot"+"_"+fileName+".png"))
        } else {
            ImageIO.write(screenshot.getImage(),'PNG', new File(System.getProperty("user.dir")+"/ErrorScreenshots/ElementScreenshot"+"_"+fileName+".png"))
        }

    } catch (Exception e) {
        e.printStackTrace()
    }
}