TesstNg parallel execution concatenate the input test data in one browser - selenium

Question

I have two test cases in a class.when run parallel using TestNg it concatenate all the test data and put it one browser While the other browser is empty.
selenium Version: 3.8.21
Firefox: Latest
testng: 6.8.21
Below is the Code
package cli;
import java.net.MalformedURLException;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;
public class test1 {
public WebDriver driver;
#BeforeMethod
public void setUp() throws MalformedURLException {
System.out.println("#BeforeMethod: The annotated method will be run before each test method.");
}
#Test
public void test() throws MalformedURLException, InterruptedException {
driver = jenkinHub.hub();
driver.get("https://www.google.com/");
driver.findElement(By.xpath("//*[#id=\"lst-ib\"]")).sendKeys("Testing");
System.out.println("This is current Url " + driver.getCurrentUrl());
Thread.sleep(9000);
driver.quit();
}
#Test
public void NotTesting() throws MalformedURLException, InterruptedException {
driver = jenkinHub.hub();
driver.get("https://www.google.com/");
driver.findElement(By.xpath("//*[#id=\"lst-ib\"]")).sendKeys("Not Testing");
System.out.println("This is current Url " + driver.getCurrentUrl());
Thread.sleep(9000);
driver.quit();
}
}
xmlFile
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >
<suite name="Regression Suite" verbose="1" parallel="methods" thread-count="3">
<test name="REgressionSuite" group-by-instances="true">
<classes>
<class name="cli.test1" />
</classes>
</test>
</suite>

Answer 1

May be it is because your driver is class level field. When first test method initializes it(driver = jenkinHub.hub()) and tries to use it, another method reassigns to it new value, so all your actions are done with the same WebDriver instance.
Try to move it in test method like this
#Test
public void test() throws MalformedURLException, InterruptedException {
WebDriver driver = jenkinHub.hub(); // create WebDriver instance
driver.get("https://www.google.com/");
driver.findElement(By.xpath("//*[#id=\"lst-ib\"]")).sendKeys("Testing");
System.out.println("This is current Url " + driver.getCurrentUrl());
Thread.sleep(9000);
driver.quit();
}
#Test
public void NotTesting() throws MalformedURLException, InterruptedException {
WebDriver driver = jenkinHub.hub(); // create another WebDriver instance
driver.get("https://www.google.com/");
driver.findElement(By.xpath("//*[#id=\"lst-ib\"]")).sendKeys("Not Testing");
System.out.println("This is current Url " + driver.getCurrentUrl());
Thread.sleep(9000);
driver.quit();
}

Answer 2

Here is the example of the how you can do it parallel, you may change the driver instantiation method as you like. Try this and then make adjustment in your code accordingly, It will open two chromes and search for test item in them and will not concatenate.
package Grid
import java.net.MalformedURLException;
import java.net.URL;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.openqa.selenium.remote.RemoteWebDriver;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;
public class test1 {
DesiredCapabilities caps;
#BeforeMethod
public void setUp() throws MalformedURLException {
System.out.println("#BeforeMethod: The annotated method will be run before each test method.");
caps = new DesiredCapabilities();
caps = DesiredCapabilities.chrome();
}
#Test
public void testing() throws MalformedURLException, InterruptedException {
WebDriver driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"),caps);
driver.get("https://www.google.com/");
driver.findElement(By.xpath("//*[#id=\"lst-ib\"]")).sendKeys("Testing");
System.out.println("This is current Url " + driver.getCurrentUrl());
Thread.sleep(9000);
driver.quit();
}
#Test
public void NotTesting() throws MalformedURLException, InterruptedException {
WebDriver driver = new RemoteWebDriver(new URL("http://localhost:4444/wd/hub"),caps);
driver.get("https://www.google.com/");
driver.findElement(By.xpath("//*[#id=\"lst-ib\"]")).sendKeys("Not Testing");
System.out.println("This is current Url " + driver.getCurrentUrl());
Thread.sleep(9000);
driver.quit();
}
}
testng.xml file (same as you have edit package name)
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >
<suite name="Regression Suite" verbose="1" parallel="methods" thread-count="4">
<test name="REgressionSuite">
<classes>
<class name="Grid.test1" />
</classes>
</test>
</suite>