截图未在TestNG侦听器中采用TestFailure（）方法

Question

当我的测试用例断言失败时，我试图在selenium webdriver中拍摄一个屏幕截图。请找到以下代码供您参考。

public abstract class TestChromeDriver {


    public WebDriver driver;

    public WebDriver getDriver(){
        return driver;
    }

    @Parameters("browser")
    @BeforeTest
    public void browserInitialize(String browser){
        if(browser.equalsIgnoreCase("chrome")){
        System.setProperty("webdriver.chrome.driver", "D:\\Aishu\\Test_Java\\TestNG Groups\\External JAR's\\chromedriver.exe");
        driver = new ChromeDriver();
        }   
    }
    @AfterTest  
    public void tearDownDriver(){
    if(driver != null){
        driver.quit();
        }
    }   
}

public class TestClass extends TestChromeDriver{

    @Test
    public void tc1_functionality(){
        driver.navigate().to("https://www.google.com");
        driver.manage().window().maximize();
        driver.findElement(By.name("q")).sendKeys("Selenium");
        driver.findElement(By.name("q")).sendKeys(Keys.ENTER);
        Assert.assertEquals("test", driver.getCurrentUrl().toLowerCase().contains("selenium"));
    }
}

public class TestListener extends TestListenerAdapter{

    @Override
    public void onTestFailure(ITestResult result){

         Object currentClass = result.getInstance();
          WebDriver driver = ((TestChromeDriver)currentClass).getDriver();

              File file = ((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE);
              try {
                  FileUtils.copyFile(file, new File("D:\\Aishu\\Test_Java\\TestNG Groups\\Images"+result.getName()+"_"+System.currentTimeMillis()+".png"));
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } 
    }

断言在我的测试方法中失败了。但即使屏幕截图没有用于失败的断言。不确定我在TestNG.XML文件甚至代码级别中做错了什么

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >
<suite name="suite1">

<listeners>
<listener class-name = "org.test.chromeDriver.TestListener"/>
</listeners>

<test name="chromeTest">
<parameter name="browser" value="chrome"/>
<classes>
<class name = "org.test.chromeDriver.TestChromeDriver"/>
<class name = "org.test.chromeDriver.TestClass"/>
</classes>
</test>
</suite>

非常感谢任何帮助。