Selenium TestNG：driver.close（）and driver.quit（）

Question

我已經寫了一個簡單的Selenium TestNG腳本，但在@AfterTest方法中得到了一個錯誤java.lang.NullPointerException。你能幫忙嗎？

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(); 
      } 

     } 

Answer 1

因爲在您的測試，你定義本地可見司機

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(); 
    } 

} 

嘗試用這個代替：

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(); 
    } 

} 

Answer 2

下面的代碼使用它會爲你工作：

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(); 
     } 

    }