Parallel execution in testNG using Maven

Question

My scenario is to launch multiple chrome browsers(minimum 2) in Parallel.

I have created a separate class for WebDriver initialization, also I have 2 xml files and in that file it has 2 tests each.

WebDriver Initialization

 public class LaunchBrowser
 {
   public WebDriver driver;

   public WebDriver initDriver() {

    if (driver == null) {
        System.setProperty("webdriver.chrome.driver", "C:\\selenium\\drivers\\chromedriver.exe");
        driver = new ChromeDriver();
        driver.manage().window().maximize();
    }
    return driver;
   }
}

XML file 1 : test method 1

public class Stackoverflow extends LaunchBrowser
{
  @Test
  public void 1test() throws InterruptedException
  {
     initDriver();
     driver.get("https://stackoverflow.com");
     Thread.sleep(3000);
     System.out.println("Stack");
  } 

  @Test
  public void 2test() throws InterruptedException
  {
    Thread.sleep(3000);
  }
}

XML file 1 : Test method 2

public class StackLogin extends LaunchBrowser
{
   @Test
   public void 1test() throws InterruptedException
   {   
     driver.findElement(By.xpath("//a[@href='https://stackoverflow.com/users/login?
ssrc=head&returnurl=https%3a%2f%2fstackoverflow.com%2f']")).click();
      Thread.sleep(3000);
   }

   @Test
   public void 2test() throws InterruptedException
   {
      Thread.sleep(3000);
   }

}

XML file 2 : Test method 1

public class Google extends LaunchBrowser
{
  @Test
  public void 1test() throws InterruptedException 
  {
     initDriver();
     driver.get("https://www.google.co.in");
     Thread.sleep(3000);
     System.out.println("Google");
  }

  @Test
  public void 2test() throws InterruptedException
  {
   Thread.sleep(3000);
  }
}

XML file 2 : Test Method 2

public class Gmail extends LaunchBrowser
{
   @Test
   public void 1test() throws InterruptedException
   {
      driver.findElement(By.xpath("//a[@href='https://mail.google.com/mail/?tab=wm'][text()='Gmail']")).click();
      Thread.sleep(3000);
   }

   @Test
   public void 2test() throws InterruptedException
   {
     Thread.sleep(3000);
   }
}

testng1.xml

<suite name="Suite1">
  <test name="01Stackoverflow">
    <classes>
        <class name="com.ci.selenium.Stackoverflow" />
    </classes>
  </test>

  <test name="02StackLogin">
    <classes>
        <class name="com.ci.selenium.StackLogin" />
    </classes>
  </test>
</suite>

testng2.xml

<suite name="Suite2">
  <test name="1Google">
     <classes>
        <class name="com.ci.selenium.Google"/>
    </classes>
  </test>

  <test name="2Gmail">
    <classes>
       <class name="com.ci.selenium.Gmail"/>
    </classes>
  </test>
</suite>

Also I have made the below configurations in my pom.xml file

<plugin>
   <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-surefire-plugin</artifactId>
          <version>2.19.1</version>
            <configuration>
               <suiteXmlFiles>${file}</suiteXmlFiles>
               <skipTests>false</skipTests>
                  <properties>
                    <property>
                        <name>suitethreadpoolsize</name>
                        <value>2</value>
                    </property>
                  </properties>
            </configuration>
</plugin>

Finally I have triggered the XML file using the below maven command.

mvn clean test -Dfile=MyWork/testng1.xml,MyWork/testng2.xml

Result:

Two Chrome browsers were launched at a time, but only first test method in each xml file got passed and the second test in both xml files gets failed.

Kindly help me to fix this issue.

Logs

 java.lang.NullPointerException
at com.ci.selenium.StackLogin.1test(StackLogin.java:12)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
... Removed 18 stack frames

MoNa · Accepted Answer · 2018-01-31 10:54:20Z

I have launched multiple(minimum 2) chrome browsers in Parallel by using the below site.

Thread Local for Parallel Test Execution

To achieve this scenario, I have created 3 classes. One for WebDriver initialization and other classes for Threads.

Class 1

public class SetTestNG implements Runnable
{
  public String xmlString;

  public SetTestNG(String suitXMLUrl){
    xmlString = suitXMLUrl;
  }

  @Override
   public void run(){
     List<String> testSuites = Lists.newArrayList();
     testSuites.add(xmlString);
     TestNG testng = new TestNG();
     testng.setTestSuites(testSuites);
     testng.run();
   }
}

Class 2 : Main Class

public class MultiThread
{
    private static String inputFiles;

   private static String[] xmlFile;

   public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException, InterruptedException
   {

      inputFiles = args[0];
      xmlFile = inputFiles.split(",");

      for(String file : xmlFile)
      {
        Thread object1 = new Thread(new SetTestNG(System.getProperty("user.dir")+"/"+file));
        object1.start();
        Thread.sleep(5000);
      }
   }

}

Note: The main use case of this code to launch Chrome browser for every single testNG Suite files.

Ankur Singh · Accepted Answer · 2018-01-04 17:35:19Z

0

You again need to initilize driver in your second Test method of both class

 public class LaunchBrowser
 {
   public WebDriver driver =null;

   public WebDriver initDriver() {

    if (driver == null) {
        System.setProperty("webdriver.chrome.driver", "C:\\selenium\\drivers\\chromedriver.exe");
        driver = new ChromeDriver();
        driver.manage().window().maximize();
    }
    return driver;
   }
}

XML file 1 : Test method 2

public class StackLogin extends LaunchBrowser
{
   @Test
   public void 1test() throws InterruptedException
   {   
initDriver();
     driver.findElement(By.xpath("//a[@href='https://stackoverflow.com/users/login?
ssrc=head&returnurl=https%3a%2f%2fstackoverflow.com%2f']")).click();
      Thread.sleep(3000);
   }

   @Test
   public void 2test() throws InterruptedException
   {
      Thread.sleep(3000);
   }

}

XML file 2 : Test Method 2

public class Gmail extends LaunchBrowser
{


@Test
   public void 1test() throws InterruptedException
   {
    initDriver();
      driver.findElement(By.xpath("//a[@href='https://mail.google.com/mail/?tab=wm'][text()='Gmail']")).click();
      Thread.sleep(3000);
   }

   @Test
   public void 2test() throws InterruptedException
   {
     Thread.sleep(3000);
   }
}

answered Jan 4, 2018 at 17:35

Ankur Singh

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3 Comments

MoNa Over a year ago

Hi Ankur, I have already tried the above steps, results was, 2 browsers were launched in parallel and first test in each xml's file gets executed and after that 2 browsers were launched for next test in each xml's file, and gets failed.

MoNa Over a year ago

My scenario is to achieve each xml file should have one chrome browser and that should execute all the test methods. In my case, I have 2 xml files, so 2 chrome browsers should get launch in that 1 for testng1.xml and another for testng2.xml.

MoNa Over a year ago

If I initialize the webdriver in all classes, then there will be no continuation between test1 and test2 methods in single xml file.

Krishnan Mahadevan · Accepted Answer · 2018-01-08 12:15:33Z

It looks like you want your webdriver instance to be created only once per <suite> tag and then shared across @Test annotated test methods that reside amongst multiple <test> tags.

For achieving this, you would need to change your LaunchBrowser class to something like below :

public class LaunchBrowser {
    protected WebDriver driver;

    @org.testng.annotations.BeforeSuite
    public void initDriver() {
        System.setProperty("webdriver.chrome.driver", "C:\\selenium\\drivers\\chromedriver.exe");
        driver = new ChromeDriver();
        driver.manage().window().maximize();
    }
}

You also need to refactor all your tests, so that they don't explicitly call LaunchBrowser.initDriver() else, it would cause the webdriver instantiation to be happened twice - explicitly by your call and implicitly once by TestNG due to the method being annotated using a @BeforeSuite annotation.

That should solve your use case. But please remember that this is the most in-efficient way of managing your webdriver instance, because you are now strictly confined to sequential execution. You cannot run tests in parallel.

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