Java Selenium TestNG:driver.close（）和driver.quit（）

我编写了一个简单的Selenium TestNG脚本，如下所示，但在

@postest

方法中得到一个错误

java.lang.NullPointerException

。你能帮忙吗

    public class TestngDemo1    
        {
            public WebDriver driver;
            public String url="https://www.guru99.com/";

            @Test
            public void LaunchURL() throws InterruptedException {         
                System.setProperty("webdriver.chrome.driver", "C:/Users/AB28488/Desktop/javawork
        space/TestNGProject/drivers/chromedriver.exe");
                WebDriver driver= new ChromeDriver(); 
                driver.get(url);  
                Thread.sleep(2000);
                String eTitle="Meet Guru99 - Free Training Tutorials & Video for IT Courses";
                String aTitle=driver.getTitle();
                Reporter.log(aTitle);
                Thread.sleep(3000);
                Assert.assertEquals(aTitle, eTitle);
                Reporter.log("This will print if titles match!",true);
           }

           @BeforeMethod
           public void BeforeMethod() {
               Reporter.log("Before Method");
           }

           @AfterMethod
           public void afterMethod() {
               Reporter.log("After method",true);
           }  

           @AfterTest 
           public void quitDriver() { 
              driver.quit();
           }

      }

---

因为在测试中，您定义了本地可见的驱动程序

public class TestngDemo1
{
    // This is your "global" driver
    public WebDriver driver;
    public String url="https://www.guru99.com/";

    @Test
    public void LaunchURL() throws InterruptedException
    {


        System.setProperty("webdriver.chrome.driver","C:/Users/AB28488/Desktop/javawork
                space/TestNGProject/drivers/chromedriver.exe");
        // This is not the same driver you have defined above as a class field        
        WebDriver driver= new ChromeDriver();
    }

    @AfterTest
    public void quitDriver()
    {
        // Here you're trying to call method of an object that does not exist.
        driver.quit();
    }

}

尝试使用以下方法：

public class TestngDemo1
{
    // This is your "global" driver
    public WebDriver driver;
    public String url="https://www.guru99.com/";

    @Test
    public void LaunchURL() throws InterruptedException
    {


        System.setProperty("webdriver.chrome.driver","C:/Users/AB28488/Desktop/javawork
                space/TestNGProject/drivers/chromedriver.exe");
        driver= new ChromeDriver();
    }

    @AfterTest
    public void quitDriver()
    {
        driver.quit();
    }

}

---

使用以下代码，它将为您工作：

    public class TestngDemo1    
        {
           public WebDriver driver;
           public String url="https://www.guru99.com/";

          @Test
          public void LaunchURL() throws InterruptedException 
          {  
            driver.get(url);  
            Thread.sleep(2000);
            String eTitle="Meet Guru99 - Free Training Tutorials & Video for IT Courses";
            String aTitle=driver.getTitle();
            Reporter.log(aTitle);
            Thread.sleep(3000);
            Assert.assertEquals(aTitle, eTitle);
            Reporter.log("This will print if titles match!",true);
         }

        @BeforeTest
        public void initDriver()
        {        
            System.setProperty("webdriver.chrome.driver","C:/Users/AB28488/Desktop/javawork
space/TestNGProject/drivers/chromedriver.exe");
            driver= new ChromeDriver(); 

         }
         @AfterTest 
         public void quitDriver()
         { 
            driver.quit();
         }

  }

---

为此，我创建了三个类：GetProperties、BaseTest和Tests。GetProperties读取config.properties文件并返回java.util.properties以及键和值（url，毫秒）

BaseTest打开和关闭浏览器

import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.firefox.FirefoxDriver;

public class BaseTest extends GetProperties{

    public static FirefoxDriver geckoDriver;
    public static ChromeDriver chromeDriver;

    @BeforeClass
    public static void driversInit() throws Exception {
        System.setProperty("webdriver.gecko.driver", "your/path/geckodriver");
        geckoDriver = new FirefoxDriver();
        System.setProperty("webdriver.chrome.driver", "your/path/chromedriver");
        chromeDriver = new ChromeDriver();
    }

    @AfterClass
    public static void driversQuit() throws Exception {
        geckoDriver.quit();
        chromeDriver.quit();
    }
}

测试运行测试

import org.junit.Test;

public class Tests extends BaseTest{
    @Test
    public void testChromeOpenURL() throws InterruptedException {
        chromeDriver.get(url);
        Thread.sleep(millis*10);
    }

    @Test
    public void testFirefoxOpenURL() throws InterruptedException {
        geckoDriver.get(url);
        Thread.sleep(millis*10);
    }
}

---

公共网络驱动程序WebDriver驱动程序=新的ChromeDriver（）；为什么要创建两个驱动程序实例。？在测试方法之前添加以下代码驱动程序=new ChromeDriver（）；不要实例化内部测试方法将类转换为TestNG，请阅读，特别是关于（MCVE）的部分，这将帮助您调试自己的程序并自行解决问题。如果您这样做了，但仍然卡住了，您可以回来发布您的MCVE，您尝试了什么，以及执行结果，包括任何错误消息，以便我们可以更好地帮助您。谢谢！你能给我正确的代码吗？我不知道什么是正确的代码，因为我不是TestNG专家。让我们详细说明一下。首先尝试将“WebDriver=new ChromeDriver（）；”更改为“driver=new ChromeDriver（）；”