In this article, I will describe how to do parallel testing on your PC (local computer) without using Selenium Grid. There are several techniques to do this operation and I will share with you some code samples.

In my former articles, I described parallel testing theory so in this tutorial I do not want to go into details. I will give the test scenarios and their implementations. Also, I will describe the details of each test files and I will add informative comments in my test automation codes.

Test Scenario for Parallel Testing

• We will have two test classes.
• First Class has three methods and all methods must open Google and check its title. First class’s test methods must run on Firefox.
• Second Class has two methods and first test method must open Google and checks its title, second test method opens Yandex and checks its title. Second class’s test methods must run on Chrome.
• All tests have to Run in Parallel in Locally!

Test Design:

1) OptionsManager Class:

This class has a “getChromeOptions” and “getFifefoxOptions” methods and they take browser name as a parameter then they provide related options as per specific browser types.

package com;

import org.openqa.selenium.chrome.ChromeOptions;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.firefox.FirefoxOptions;
import org.openqa.selenium.firefox.FirefoxProfile;

public class OptionsManager {

    //Get Chrome Options
    public static ChromeOptions getChromeOptions() {
        ChromeOptions options = new ChromeOptions();
        options.addArguments("--start-maximized");
        options.addArguments("--ignore-certificate-errors");
        options.addArguments("--disable-popup-blocking");
        //options.addArguments("--incognito");
        return options;
        /*ChromeDriverService service = new ChromeDriverService.Builder()
                .usingAnyFreePort()
                .build();
        ChromeDriver driver = new ChromeDriver(service, options);*/
    }

    //Get Firefox Options
    public static FirefoxOptions getFirefoxOptions () {
        FirefoxOptions options = new FirefoxOptions();
        FirefoxProfile profile = new FirefoxProfile();
        //Accept Untrusted Certificates
        profile.setAcceptUntrustedCertificates(true);
        profile.setAssumeUntrustedCertificateIssuer(false);
        //Use No Proxy Settings
        profile.setPreference("network.proxy.type", 0);
        //Set Firefox profile to capabilities
        options.setCapability(FirefoxDriver.PROFILE, profile);
        return options;
    }
}

2) ThreadLocal Driver Factory Class:

First of all, for Thread-Safe test automation, I will use ThreadLocal<WebDriver> and I will create a ThreadLocalDriverFactory (TLDriverFactory) class to set ThreadLocal driver and get Webdriver.

package com;

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.openqa.selenium.support.ui.WebDriverWait;

/**
 * Created by onurb on 19-Dec-16.
 */
public class TLDriverFactory {

    private static ThreadLocal<WebDriver> tlDriver = new ThreadLocal<>();

    public synchronized static void setTLDriver (String browser) {
        if (browser.equals("firefox")) {
            tlDriver = ThreadLocal.withInitial(() -> new FirefoxDriver(OptionsManager.getFirefoxOptions()));
        } else if (browser.equals("chrome")) {
            tlDriver = ThreadLocal.withInitial(() -> new ChromeDriver(OptionsManager.getChromeOptions()));
        }
    }

    public synchronized static WebDriver getTLDriver () {
        return tlDriver.get();
    }
}

3) TestBase Class:

In Base Test class,  @BeforeMethod I got browser parameter from TestNG.xml file (I will describe it soon),  and I set and get ThreadLocal Driver by using TLDriverFactory class. @AfterMethod, I closed the driver.

package com;

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.openqa.selenium.support.ui.WebDriverWait;
import org.testng.annotations.*;

import java.net.MalformedURLException;

/**
 * Created by ONUR on 03.12.2016.
 */
public class TestBase {

    protected WebDriverWait wait;

    //Do the test setup
    @BeforeMethod
    @Parameters(value={"browser"})
    public void setupTest (@Optional String browser) throws MalformedURLException {
        //Set & Get ThreadLocal Driver with Browser
        TLDriverFactory.setTLDriver(browser);
        wait = new WebDriverWait(TLDriverFactory.getTLDriver(), 15);
    }

    @AfterMethod
    public synchronized void tearDown() throws Exception {
        TLDriverFactory.getTLDriver().quit();
    }

}

4) FirstTest Class:

package com;

import org.testng.Assert;
import org.testng.annotations.Test;

/**
 * Created by ONUR on 03.12.2016.
 */
public class FirstTest extends TestBase {

    @Test
    public void GOOGLE0() throws Exception {
        System.out.println("Google0 Test Started! " + Thread.currentThread().getId());
        TLDriverFactory.getTLDriver().navigate().to("http://www.google.com");
        System.out.println("Google0 Test's Page title is: " + TLDriverFactory.getTLDriver().getTitle() + " " + Thread.currentThread().getId());
        Assert.assertEquals(TLDriverFactory.getTLDriver().getTitle(), "Google");
        System.out.println("Google0 Test Ended! " + Thread.currentThread().getId());
    }

    @Test
    public void GOOGLE2() throws Exception {
        System.out.println("Google2 Test Started! " + Thread.currentThread().getId());
        TLDriverFactory.getTLDriver().navigate().to("http://www.google.com");
        System.out.println("Google2 Test's Page title is: " + TLDriverFactory.getTLDriver().getTitle() + " " + Thread.currentThread().getId());
        Assert.assertEquals(TLDriverFactory.getTLDriver().getTitle(), "Google");
        System.out.println("Google2 Test Ended! " + Thread.currentThread().getId());
    }

    @Test
    public void GOOGLE3() throws Exception {
        System.out.println("Google3 Test Started! " + Thread.currentThread().getId());
        TLDriverFactory.getTLDriver().navigate().to("http://www.google.com");
        System.out.println("Google3 Test's Page title is: " + TLDriverFactory.getTLDriver().getTitle() + " " + Thread.currentThread().getId());
        Assert.assertEquals(TLDriverFactory.getTLDriver().getTitle(), "Google");
        System.out.println("Google3 Test Ended! " + Thread.currentThread().getId());
    }

    @Test
    public void GOOGLE4() throws Exception {
        System.out.println("Google4 Test Started! " + Thread.currentThread().getId());
        TLDriverFactory.getTLDriver().navigate().to("http://www.google.com");
        System.out.println("Google3 Test's Page title is: " + TLDriverFactory.getTLDriver().getTitle() + " " + Thread.currentThread().getId());
        Assert.assertEquals(TLDriverFactory.getTLDriver().getTitle(), "Google");
        System.out.println("Google3 Test Ended! " + Thread.currentThread().getId());
    }

}

5) SecondTest Class:

package com;

import org.testng.Assert;
import org.testng.annotations.Test;

/**
 * Created by ONUR on 03.12.2016.
 */
public class SecondTest extends TestBase{

    @Test
    public void GOOGLE1() throws Exception {
        System.out.println("Google1 Test Started! " + Thread.currentThread().getId());
        TLDriverFactory.getTLDriver().navigate().to("http://www.google.com");
        System.out.println("Google1 Test's Page title is: " + TLDriverFactory.getTLDriver().getTitle() + " " + Thread.currentThread().getId());
        Assert.assertEquals(TLDriverFactory.getTLDriver().getTitle(), "Google");
        System.out.println("Google1 Test Ended! " + Thread.currentThread().getId());
    }

    @Test
    public void YANDEX() throws Exception {
        System.out.println("Yandex Test Started! " + Thread.currentThread().getId());
        TLDriverFactory.getTLDriver().navigate().to("http://www.yandex.com");
        System.out.println("Yandex Test's Page title is: " + TLDriverFactory.getTLDriver().getTitle() + " " + Thread.currentThread().getId());
        Assert.assertEquals(TLDriverFactory.getTLDriver().getTitle(), "Yandex");
        System.out.println("Yandex Test Ended! " + Thread.currentThread().getId());
    }
}

6) TestNG.xml File:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite thread-count="2" name="Suite" parallel="tests" >
    <test name="com.FirstTest" parallel="methods" thread-count="5">
        <parameter name="browser" value="firefox"/>
        <classes>
            <class name="com.FirstTest">
                <methods>
                    <include name="GOOGLE0" />
                    <include name="GOOGLE2" />
                </methods>
            </class>
        </classes>
    </test> <!-- First Test -->
    <test name="com.SecondTest"  parallel="methods" thread-count="4">
        <parameter name="browser" value="chrome"/>
        <classes>
            <class name="com.SecondTest">
                <methods>
                    <include name="GOOGLE1" />
                </methods>
            </class>
        </classes>
    </test> <!-- Second Test -->
</suite> <!-- Suite -->

7) POM.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>TestNGParallel</groupId>
    <artifactId>TestNGParallel</artifactId>
    <version>1.0-SNAPSHOT</version>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <dependencies>
        <dependency>
            <groupId>org.seleniumhq.selenium</groupId>
            <artifactId>selenium-java</artifactId>
            <version>RELEASE</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.testng</groupId>
            <artifactId>testng</artifactId>
            <version>RELEASE</version>
        </dependency>
    </dependencies>
</project>

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LATEST NOTES

If you have several test classes and in those test classes if you have more than one test methods, then you can run those test classes and methods in parallel with below TestNG configuration.

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite thread-count="2" name="Suite" parallel="tests" >
    <test name="com.FirstTest" parallel="methods" thread-count="5">
        <parameter name="browser" value="chrome"/>
        <parameter name="platform" value="WINDOWS"/>
        <classes>
            <class name="com.FirstTest">
                <methods>
                    <include name="GOOGLE0" />
                    <include name="GOOGLE2" />
                </methods>
            </class>
        </classes>
    </test> <!-- First Test -->
    <test name="com.SecondTest"  parallel="methods" thread-count="4">
        <parameter name="browser" value="chrome"/>
        <parameter name="platform" value="WINDOWS"/>
        <classes>
            <class name="com.SecondTest">
                <methods>
                    <include name="GOOGLE1" />
                </methods>
            </class>
        </classes>
    </test> <!-- Second Test -->
</suite> <!-- Suite -->

Above configuration runs two parallel test classes because of below line.

<suite thread-count=”2″ name=”Suite” parallel=”tests” >

And it also runs five test methods of test class one in parallel too by using below line.

<test name=”com.FirstTest” parallel=”methods” thread-count=”5″>

And it also runs four test methods of test class two in parallel too by using below line.

<test name=”com.SecondTest” parallel=”methods” thread-count=”4″>

Here is the result for parallel testing in local machine!

Execution Order of Parallel Testing in Local Computer:

Google2 Test Started! 15
Google1 Test Started! 13
Google0 Test Started! 14
Google1 Test’s Page title is: Google 13
Google1 Test Ended! 13
Google2 Test’s Page title is: Google 15
Google0 Test’s Page title is: Google 14
Google2 Test Ended! 15
Google0 Test Ended! 14

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Thanks.
-Onur