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java - TestNG - 并行测试执行，WebDriver nullpointer

问题描述

我确信它必须是一个容易解决的问题，但此刻我什么都没有想到，情况就是这样。

我有一个单例类 (DriverFactory.class) 来设置和检索 ThreadLocal 对象。两个并行运行的测试类（FirstTestClass），（SecondTestClass）和第三个TestListenerAdapter类，其中我想使用实际运行的WebDriver实例（它应该绑定到线程）但是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 testParallel.FirstTestClass 线程 ID：22 名称：TestNG

类 testParallel.SecondTestClass 线程 ID：23 名称：TestNG

类 testParallel.testSetup 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) 在 org.testng.internal.Invoker.invokeMethod(Invoker.java:778) 在 org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901) 在 org. testng.internal.Invoker.invokeTestMethods(Invoker.java:1231) at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127) at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111) at org .testng.TestRunner.privateRun(TestRunner.java:767) 在 org.testng.TestRunner.run(TestRunner.java:617) 在 org.testng.SuiteRunner.runTest(SuiteRunner.java:334) 在 org.testng.SuiteRunner.access$000(SuiteRunner.java:37) at org.testng.SuiteRunner$SuiteWorker.run(SuiteRunner.java:368) at org.testng.internal.thread.ThreadUtil$2.call(ThreadUtil.java:64)在 java.util.concurrent.FutureTask.run(FutureTask.java:266) 在 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 在 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java :617) 在 java.lang.Thread.run(Thread.java:745) 当前 URL 是：concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 在 java.lang.Thread.run(Thread.java:745) 当前 URL 是：concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 在 java.lang.Thread.run(Thread.java:745) 当前 URL 是：https://pl.wikipedia.org/wiki/Wikipedia:Strona_g%C5%82%C3%B3wna

标签： javawebdrivertestngthread-localparallels

解决方案

在 Listeners 中，我们不能直接访问其他类实例。因为，它会在执行开始时开始监听。如果我们需要获取某个特定的类实例，那么我们可以通过ITestResult如下所示的 TestNG Listeners() 访问，并且您的所有测试类都应该继承DriverFactory该类。

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);
    }

}

测试类 1：

public class FirstTestClass extends DriverFactory {

    WebDriver driver;

测试类 2：

public class SecondTestClass extends DriverFactory {

    WebDriver driver;

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