How can I execute multiple test class 'test1' and 'test2' parallely? Which is using the same function in another class using TestNG.

When I define the parallel option as 'classes' and thread-count as '2' in TestNG XML, the login page is loading two times, but 'sendelement' method is executing in single browser two times simultaneously.

for eg; if my login is 'user1', sendelement function execute two times as 'user1user1' in the username field and shows invalid login.

<?xml version="1.0" encoding="UTF-8"?>
<!--  <!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd"> -->
<suite name="Suite" parallel="classes" thread-count="2">

    <test name="NavigationTest">
            <class name="Test1" />
            <class name="Test2" />

public class Test1 {

    loginToUserPage(strUserName, strPassword);

public class Test2{

    loginToUserPage(strUserName, strPassword);

public class Test3
    public void loginToUserPage(String strUserName,String strPassword) 
        webdriverCommon.sendElement(CommonRepo.userName_Edit, strUserName);
        webdriverCommon.sendElement(CommonRepo.password_Edit, strPassword);

  • Where do your username and password come from? I don't see that data anywhere. – FDM May 26 '17 at 9:03
  • strUserName,strPassword are username, password variables.. CommonRepo.userName_Edit and CommonRepo.userName_Edit are the By elements for input fields in UI – sreelakshmi May 26 '17 at 12:21
  • Can you show the actual test class where you pass the data? – FDM May 26 '17 at 12:34

It looks like you are using one webDriver, webdriverCommon. You'll need to setup your framework such that each class or test uses its own driver. I have a TestBase class that each test class inherits from. The following example is using JUnit but the idea is the same.

public class TestBase {

    protected WebDriver driver;
    protected String baseUrl = "http://example.com/";
    protected String hubUrl = "http://localhost:4444/wd/hub";

    public void setUp() throws Exception{
        try {
            DesiredCapabilities capability = DesiredCapabilities.chrome();
            driver = new RemoteWebDriver(new URL(hubUrl), capability);
        catch (Exception e){
            System.setProperty("webdriver.chrome.driver", "C:\\Selenium\\chromedriver.exe");
            driver = new ChromeDriver();
        driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);

    public void tearDown() throws Exception{
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