TestNG - 并行测试执行，WebDriver nullpointer

Question

我相信这必须很容易解决，但此刻我什么都没有想到，这就是情况。

我有一个单例类(DriverFactory.class(来设置和检索ThreadLocal对象。 并行运行的两个测试类(FirstTestClass(，(SecondTestClass( 和第三个 TestListenerAdapter 类，其中包含我想使用实际运行的 WebDriver 实例的方法(它应该绑定到线程(，但在这里我得到空指针异常，即使，这是代码

import config.DriverFactory;
import org.junit.Assert;
import org.testng.annotations.Test;
import org.openqa.selenium.WebDriver;
public class SecondTestClass {
WebDriver driver;
public SecondTestClass()throws Exception{
DriverFactory.getInstance().setDriver();
driver = DriverFactory.getInstance().getDriver();;
}
@Test
public void testInSecondClass() {
System.out.println("n THREAD ID: " + Thread.currentThread().getId() + " " + "n Name: " + Thread.currentThread().getName());
driver.get("https://www.allsaints.com");
System.out.println("CURRENT URL IS :" + driver.getCurrentUrl());
Assert.assertTrue(false);
}
}

package testParallel;
import config.DriverFactory;
import org.openqa.selenium.WebDriver;
import org.testng.annotations.Test;
public class FirstTestClass {
WebDriver driver;
public FirstTestClass()throws Exception{
DriverFactory.getInstance().setDriver();
driver = DriverFactory.getInstance().getDriver();;
}
@Test
public void testInFirstClass() throws Exception{
System.out.println("n THREAD ID: " + Thread.currentThread().getId() + " " + "n Name: " + Thread.currentThread().getName());
DriverFactory.getInstance().setDriver();
driver = DriverFactory.getInstance().getDriver();;
driver.get("https://pl.wikipedia.org");
System.out.println("CURRENT URL IS :" + driver.getCurrentUrl());
}
}

package config;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
public class DriverFactory {
private static DriverFactory instance = null;
public ThreadLocal<WebDriver> webDriver = new ThreadLocal<WebDriver>();
private DriverFactory() {}
@SuppressWarnings("varargs")
public static DriverFactory getInstance() {
if (instance == null) {
instance = new DriverFactory();
}
return instance;
}
public final void setDriver() throws Exception {
System.setProperty("webdriver.gecko.driver", "E:\Projects\allsaints\tess\drivers\geckodriver.exe");
webDriver.set(new FirefoxDriver());
}
public WebDriver getDriver() throws Exception {
return webDriver.get();
}
}

import config.DriverFactory;
import org.openqa.selenium.WebDriver;
import org.testng.ITestResult;
import org.testng.TestListenerAdapter;
public class testSetup extends TestListenerAdapter {
@Override
public void onTestFailure(ITestResult tr) {
System.out.println(
"n THREAD ID: " + Thread.currentThread().getId() + " " +
"n Name: " + Thread.currentThread().getName()
);
WebDriver driver;
try {
driver = DriverFactory.getInstance().getDriver();
System.out.println("CURRENT URL IS :" + driver.getCurrentUrl());
} catch (Exception e) {
e.printStackTrace();
}
super.onTestFailure(tr);
}
}

<?xml version="1.0"?>
<suite name="All Test Suite" parallel="tests" thread-count="5">
<listeners>
<listener class-name="testParallel.testSetup"/>
</listeners>
<test verbose="3" preserve-order="true" name="test1">
<classes>
<class name="testParallel.FirstTestClass"/>
</classes>
</test>
<test name="test2">
<classes>
<class name="testParallel.SecondTestClass"/>
</classes>
</test>
</suite>

控制台输出

类

测试并行。第一测试类 线程 ID： 22 名称： 测试NG

类测试并行.第二测试类 线程 ID： 23 名称： 测试NG

类测试并行测试设置 线程 ID： 23 名称： TestNG java.lang.NullPointerException at testParallel.testSetup.onTestFailure(testSetup.java：21( at org.testng.internal.Invoker.runTestListeners(Invoker.java：1895( at org.testng.internal.Invoker.runTestListeners(Invoker.java：1879( at org.testng.internal.Invoker.invokeMethod(Invoker.java：778( at org.testng.internal.Invoker.invokeTestMethod(Invoker.java：901( at org.testng.internal.Invoker.invokeTestMethods(Invoker.java：1231( at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java：127( 在 org.testng.internal.TestMethodWorker.run(TestMethodWorker.java：111( at org.testng.TestRunner.privateRun(TestRunner.java：767( at org.testng.TestRunner.run(TestRunner.java：617( at org.testng.SuiteRunner.runTest(SuiteRunner.java：334( at org.testng.SuiteRunner.access$000(SuiteRunner.java：37( at org.testng.SuiteRunner$SuiteWorker.run(SuiteRunner.java：368( at org.testng.internal.thread.ThreadUtil$2.call(ThreadUtil.java：64( at java.util.concurrent.FutureTask.run(FutureTask.java：266( at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java：1142( 在 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java：617( at java.lang.Thread.run(Thread.java：745( 当前网址是 ：https://pl.wikipedia.org/wiki/Wikipedia:Strona_g%C5%82%C3%B3wna

Answer 1

在侦听器中，我们不能直接访问其他类实例。因为，它将在执行开始时开始侦听。如果我们需要获取一些特定的类实例，那么我们可以通过 TestNG 侦听器(ITestResult(访问，如下所示，并且您的所有测试类都应该继承DriverFactory类。

侦听器类代码：

public class testSetup extends TestListenerAdapter {
@Override
public void onTestFailure(ITestResult tr) {
System.out.println(
"n THREAD ID: " + Thread.currentThread().getId() + " " +
"n Name: " + Thread.currentThread().getName()
);
Object currentClass=tr.getInstance();
WebDriver driver;
try {
driver =((DriverFactory) currentClass).getDriver();
System.out.println("CURRENT URL IS :" + driver.getCurrentUrl());
} catch (Exception e) {
e.printStackTrace();
}
super.onTestFailure(tr);
}
}

测试等级 1：

public class FirstTestClass extends DriverFactory {
WebDriver driver;

测试类 2：

public class SecondTestClass extends DriverFactory {
WebDriver driver;