当测试失败时，无法从testnglistner ontestfailure方法获取屏幕截图
[英]can't able to take screenshot from testnglistner ontestfailure method when ever the test fails
问题描述
Please find below the complete code for testNGlistner . 
请在下面找到testNGlistner的完整代码。 Kindly check. 好心检查。 package pom; 包装袋;
import java.io.File;
import java.io.IOException;
import org.apache.commons.io.FileUtils;
import org.openqa.selenium.OutputType;
import org.openqa.selenium.TakesScreenshot;
import org.openqa.selenium.WebDriver;
import org.testng.ITestContext;
import org.testng.ITestListener;
import org.testng.ITestResult;
import com.aventstack.extentreports.ExtentReports;
import com.aventstack.extentreports.ExtentTest;
import com.aventstack.extentreports.MediaEntityBuilder;
import com.aventstack.extentreports.Status;
import com.aventstack.extentreports.markuputils.ExtentColor;
import com.aventstack.extentreports.markuputils.MarkupHelper;
import com.aventstack.extentreports.reporter.ExtentHtmlReporter;
import com.aventstack.extentreports.reporter.configuration.ChartLocation;
import com.aventstack.extentreports.reporter.configuration.Theme;
import generic.BaseTest;
public class testNgListners extends BaseTest implements ITestListener {
ExtentHtmlReporter htmlReporter;
ExtentReports extent;
ExtentTest logger;
@Override
public void onTestStart(ITestResult result) {
}
@Override
public void onTestSuccess(ITestResult result) {
logger = extent.createTest(result.getName());
logger.log(Status.PASS, MarkupHelper.createLabel(result.getName(), ExtentColor.GREEN));
}
@Override
public void onTestFailure(ITestResult result) {
System.out.println("hii");
logger = extent.createTest(result.getName());
logger.log(Status.FAIL, MarkupHelper.createLabel(result.getName(), ExtentColor.RED));
if (result.getStatus() == ITestResult.FAILURE) {
TakesScreenshot take = (TakesScreenshot) driver;
File srcFile = take.getScreenshotAs(OutputType.FILE);
File destFile = new File("./test-output/Sceenshots/" + result.getName() + ".png");
try {
FileUtils.copyFile(srcFile, destFile);
System.out.println("Screenshot is been taken for failed test case: " + result.getName());
logger.fail("Screenshot below" + logger.addScreenCaptureFromPath("./test-output/Sceenshots/" + result.getName() + ".png"));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Override
public void onTestSkipped(ITestResult result) {
//logger=extent.createTest(result.getName());
logger.log(Status.SKIP, MarkupHelper.createLabel(result.getName(), ExtentColor.ORANGE));
}
@Override
public void onTestFailedButWithinSuccessPercentage(ITestResult result) {}
@Override
public void onStart(ITestContext context) {
htmlReporter = new ExtentHtmlReporter("./test-output/extent.html");
extent = new ExtentReports();
extent.attachReporter(htmlReporter);
extent.setSystemInfo("Host name", "localhost");
extent.setSystemInfo("Environment", "QA");
extent.setSystemInfo("user", "Arun K M");
htmlReporter.config().setDocumentTitle("Hybrid Automation Report");
htmlReporter.config().setReportName("Functional Testing");
htmlReporter.config().setTestViewChartLocation(ChartLocation.TOP);
htmlReporter.config().setTheme(Theme.STANDARD);
}
@Override
public void onFinish(ITestContext context) {
extent.flush();
}
}
while taking a screenshot it throws null pointer exception. 截取屏幕截图时会抛出空指针异常。 Kindly help me to resolve this. 请帮我解决这个问题。 PFB the error details: PFB错误详情：
java.lang.NullPointerException at pom.testNgListners.onTestFailure(testNgListners.java:53) at org.testng.internal.TestListenerHelper.runTestListeners(TestListenerHelper.java:67) at org.testng.internal.Invoker.runTestListeners(Invoker.java:1389) at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1042) at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125) at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109) at org.testng.TestRunner.privateRun(TestRunner.java:648) at org.testng.TestRunner.run(TestRunner.java:505) at org.testng.SuiteRunner.runTest(SuiteRunner.java:455) at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:450) at org.testng.SuiteRunner.privateRun(SuiteRunner.java:415) at org.testng.SuiteRunner.run(SuiteRunner.java:364) at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52) at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:84) at org.testng.TestNG.runSuitesSequentially(TestNG.java:1208) a
Hi Krishna, 嗨克里希纳，
PFB the basetest code. PFB是基准测试代码。
package generic;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Properties;
import java.util.concurrent.TimeUnit;
import org.apache.commons.io.FileUtils;
import org.openqa.selenium.OutputType;
import org.openqa.selenium.PageLoadStrategy;
import org.openqa.selenium.TakesScreenshot;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.chrome.ChromeOptions;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
public class BaseTest implements Autoconst {
File file=new File("\\\\192.168.70.39\\IT Share\\Automation\\ERP Automation\\credential.properties");
Properties prop = new Properties();
public WebDriver driver;
@Parameters({"browser"})
@BeforeMethod
public void precondition()
{
if(browser.equals("chrome"))
{
FileInputStream fileInput =null;
try {
fileInput = new FileInputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
prop.load(fileInput);
} catch (Exception e) {
e.printStackTrace();
}
System.setProperty(GECKO_KEY,GECKO_VALUE);
ChromeOptions options = new ChromeOptions();
options.setPageLoadStrategy(PageLoadStrategy.NONE);
driver=new ChromeDriver();
driver.manage().timeouts().implicitlyWait(10,TimeUnit.SECONDS);
driver.get(prop.getProperty("URL"));
driver.manage().window().maximize();
}
}
@AfterMethod
public void postcondition()
{
driver.quit();
}
}
1 个解决方案
解决方案1
0 已采纳 2019-05-25 05:44:40
You have mixed up TestNG listeners and Testclass related annotations together and that is what is causing the NullPointerException 您已将TestNG侦听器和Testclass相关注释混合在一起，这就是导致NullPointerException
I am guessing you have a test class which is also extending BaseTest . 我猜你有一个测试类，它也在扩展BaseTest 。 For the sake of example let's call that class as RegressionTest . 为了举例，我们将该类称为RegressionTest 。
TestNG now creates two instances : TestNG现在创建两个实例：
- 1 instance for
RegressionTestclassRegressionTest类的1个实例 - 1 instance for
testNgListnersclass.testNgListners类的1个实例。
But the catch is that when the testNgListners instance is created, the @BeforeMethod and @AfterMethod annotations are not invoked at all, because these annotations don't have any relevance in the context of a listener. 但问题是，当创建testNgListners实例时， testNgListners不会调用@BeforeMethod和@AfterMethod注释，因为这些注释在侦听器的上下文中没有任何相关性。
To fix this, you need to do the following: 要解决此问题，您需要执行以下操作：
- Refactor
testNgListnersso that it does not extendBaseTest重构testNgListners，使其不扩展BaseTest - Now within
BaseTestmove the browser instantiation and cleanup logic from it.现在，在BaseTest移动浏览器实例化和清理逻辑。 - You should manage your browser instantiation via a TestNG listener, because the driver object is also going to be used by your testng to take screenshots whenever there is a failure. 您应该通过TestNG侦听器管理浏览器实例化，因为每当发生故障时，您的testng也会使用驱动程序对象来截取屏幕截图。
Here's how the modified listener would look like: 以下是修改后的侦听器的外观：
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Properties;
import java.util.concurrent.TimeUnit;
import org.apache.commons.io.FileUtils;
import org.openqa.selenium.OutputType;
import org.openqa.selenium.PageLoadStrategy;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.chrome.ChromeOptions;
import org.openqa.selenium.remote.RemoteWebDriver;
import org.testng.ITestListener;
import org.testng.ITestResult;
import org.testng.Reporter;
public class BrowserManagementListener implements ITestListener {
private static final String BROWSER = "browser";
private File file =
new File("\\\\192.168.70.39\\IT Share\\Automation\\ERP Automation\\credential.properties");
private Properties prop = new Properties();
public static RemoteWebDriver getDriver() {
ITestResult result = Reporter.getCurrentTestResult();
if (result == null) {
throw new IllegalStateException("could not detect a valid test result");
}
Object object = result.getAttribute(BROWSER);
if (object == null) {
throw new IllegalStateException("could not find a browser");
}
return (RemoteWebDriver)object;
}
@Override
public void onTestStart(ITestResult result) {
// This line retrieves the value of
// <parameter name="browser" value="chrome"/> from your testng suite xml
String browser = result.getTestContext().getCurrentXmlTest().getParameter("browser");
if ("chrome".equalsIgnoreCase(browser)) {
FileInputStream fileInput = null;
try {
fileInput = new FileInputStream(file);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
prop.load(fileInput);
} catch (Exception e) {
e.printStackTrace();
}
}
ChromeOptions options = new ChromeOptions();
options.setPageLoadStrategy(PageLoadStrategy.NONE);
RemoteWebDriver driver = new ChromeDriver();
driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
driver.manage().window().maximize();
result.setAttribute(BROWSER, driver);
}
@Override
public void onTestSuccess(ITestResult result) {
cleanUpBrowser(result);
}
@Override
public void onTestFailure(ITestResult result) {
Object object = result.getAttribute(BROWSER);
if (object == null) {
return;
}
RemoteWebDriver driver = (RemoteWebDriver) object;
File srcFile = driver.getScreenshotAs(OutputType.FILE);
File destFile = new File("test-output/" + result.getName() + ".png");
try {
FileUtils.copyFile(srcFile, destFile);
System.out.println("Screenshot is been taken for failed test case: " + result.getName());
System.err.println("Screenshot below" + destFile.getAbsolutePath());
} catch (IOException e) {
e.printStackTrace();
} finally {
cleanUpBrowser(result);
}
}
private void cleanUpBrowser(ITestResult result) {
Object driver = result.getAttribute(BROWSER);
if (driver != null) {
((RemoteWebDriver) driver).quit();
result.setAttribute(BROWSER, null);
}
}
}
And here's how a test class would look like 以下是测试类的外观
import org.testng.annotations.Listeners;
import org.testng.annotations.Test;
@Listeners(BrowserManagementListener.class)
public class SampleTestClass {
@Test
public void testMethod() {
BrowserManagementListener.getDriver().get("http://www.google.com");
throw new RuntimeException("Simulating an error");
}
}
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.