Run Parallel Test Cases in TestNG in 2026

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Most examiner assume running exam in latitude with TestNGis straightforward—just flip a config, increase thread count, and watch your suite finish faster.

I believed that too, until aroutine fixation run took far longer than ask. I tried reorganizing classes, reduce steps, and removing delays, but nothing meaningfully better theperformance time.

That ’ s when I understood the real value ofTestNG ’ s parallel executingcapabilities and how much clip I had be losing without them.

& lt;! DOCTYPE entourage SYSTEM `` https: //testng.org/testng-1.0.dtd '' & gt; & lt; suite name= '' ParallelSuite '' parallel= '' methods '' thread-count= '' 4 '' & gt; & lt; test name= '' ParallelMethodExecution '' & gt; & lt; classes & gt; & lt; class name= '' com.example.tests.SampleTest '' / & gt; & lt; /classes & gt; & lt; /test & gt; & lt; /suite & gt;

This clause covers how parallel performance works in TestNG, how to configure it at different levels, and how to avoid common issues so your tryout suites run faster and scale more efficiently.

What is TestNG?

TestNG is a knock-down testing framework for Java designed to simplify the creation, performance, and management of. Inspired by, it proffer more advanced features, include, flexible configuration options, and built-in support for parallel execution.

TestNG countenance quizzer to structure their expeditiously through testng.xml, enabling fine-grained control over test pigeonholing, sequencing, and dependencies.

Its ability to integrate seamlessly with makes it one of the about wide adopted frameworks for mechanization.

With features such as, parameterization, reporting, and multi-threaded execution, TestNG provides the tractableness needed to scale test retinue and improve execution speed—making it particularly valuable in uninterrupted testing and environs.

What is Parallel Execution in TestNG?

is the praxis of run multiple tests simultaneously in separate threads. In the context ofand TestNG, this mean you can execute tests across different browsers, devices, and environments at the same clip rather than running them one after another.

According toSarah Thomas, an expert in software testing, parallel tests should always be contrive asindependent, thread-safe units, with each thread managing its own WebDriverrepresentative to prevent interference and ensure consistent execution.

The primary finish of parallel execution is to significantlyreduce overall test execution time while increasing environment coverage.

For example, imagine a saneness suite of 50 test cases that must run on both Chrome and Firefox. Executed sequentially, you would spend one hour running the suite on Chrome and another hr on Firefox—two hours in total.

With parallel execution, both run can come concurrently, completing in some one hour and cutting executing time by 50 %.

TestNG endorse parallelism at multiple levels, includemethods, classes, and test suites. Using thetestng.xmlform file, you can delineate the parallel mode and specify the number of yarn.

& lt; suite name= '' Parallel Test Suite '' thread-count= '' 2 '' parallel= '' methods '' & gt;

By compound TestNG ’ s parallel execution capability with the right infrastructure, teams can attain quicker feedback and panoptic coverage without increase complexity.

This is where platforms like become especially valuable, offering instant accession to real browsers and devices so parallel tryout can run reliably at scale.

How to Perform Parallel Execution in TestNG

TestNG render built-in support for parallel testing. This section excuse how you can run parallel tests in TestNG.

Before setting it up, there are a few key prerequisites to ensure politic and effective parallel performance.

Prerequisites

• Add TestNGto your project (via Maven/Gradle or JAR).
• Set up a test framework(e.g., Selenium).
• Create a testng.xmlfile to configure parallel execution
• Ensure thread refuge, especially for WebDriver instances.
• Use proper TestNG annotationsto construction tests.

Download expect Maven dependence

1. Install Java 8 or high and setJAVA_HOMEin system surroundings variables.
2. For a Maven project, add Selenium Java, TestNG andWebDriverManagerdependency. Save thepom.xmlfile to download all the dependencies.
3. Add the TestNG library toclasspath.

& lt; dependencies & gt; & lt; dependency & gt; & lt; groupId & gt; org.seleniumhq.selenium & lt; /groupId & gt; & lt; artifactId & gt; selenium-java & lt; /artifactId & gt; & lt; version & gt; 4.5.0 & lt; /version & gt; & lt; /dependency & gt; & lt; dependency & gt; & lt; groupId & gt; org.testng & lt; /groupId & gt; & lt; artifactId & gt; testng & lt; /artifactId & gt; & lt; version & gt; 7.6.1 & lt; /version & gt; & lt; setting & gt; test & lt; /scope & gt; & lt; /dependency & gt; & lt; dependency & gt; & lt; groupId & gt; io.github.bonigarcia & lt; /groupId & gt; & lt; artifactId & gt; webdrivermanager & lt; /artifactId & gt; & lt; variant & gt; 5.2.1 & lt; /version & gt; & lt; /dependency & gt; & lt; /dependencies & gt;

Executing Test Methods Sequentially in TestNG

Below program runs the test method consecutive:

Step 1: Under src/test/javacreate a package and under that create a family asParallelTest

public class ParallelTest {WebDriver driver; @ Test (priority = 1) public void testChrome () throws InterruptedException {System.out.println (`` The thread ID for Chrome is `` + Thread.currentThread () .getId ()); WebDriverManager.chromedriver () .setup (); driver = new ChromeDriver (); driver.get (`` https: //www.bstackdemo.com/ ''); driver.manage () .window () .maximize (); Assert.assertEquals (driver.getTitle (), `` StackDemo '');} @ Test (priority = 2) public nothingness testFirefox () cast InterruptedException {System.out.println (`` The thread ID for Firefox is `` + Thread.currentThread () .getId ()); WebDriverManager.firefoxdriver () .setup (); driver = new FirefoxDriver (); driver.get (`` https: //www.bstackdemo.com/ ''); driver.manage () .window () .maximize (); Assert.assertEquals (driver.getTitle (), `` StackDemo '');} @ AfterClass public void closely () {driver.quit ();}}

Step 2:Right chink on the class and selectRun As >> TestNG Test. Observe the time taken to execute both the method in a sequential way. It takes 18486 ms as see below

Now let us run both the method in latitude.

To do so you require to first create atesting.xmlfile and add a parallel attribute for the test suite with value asmethods.

Parallel Execution at different levels in TestNG

TestNG countenance you Parallel Execution at different levels such as:

• Parallel Execution of Test Methods
• Parallel Execution of Test Classes and
• Parallel Execution of Test Suites

You can realize these different level of Parallel Execution in TestNG utilise examples as demonstrated in the section below.

Executing Parallel Test Methods in TestNG

Step 1:To create atesting.xmlfile, right click on theParallelTestclass and selectTestNG >> Convert To TestNG.

Step 2:You may selectParallel mode and ThreadCountvalue of your selection while creating thetesting.xmlfile or you may update it later as per the requisite change. I have selectedParallel mode as methods and ThreadCount as 2.

& lt;? xml version= '' 1.0 '' encoding= '' UTF-8 ''? & gt; & lt;! DOCTYPE suite SYSTEM `` https: //testng.org/testng-1.0.dtd '' & gt; & lt; suite name= '' Parallel Test Suite '' parallel= '' methods '' thread-count= '' 2 '' & gt; & lt; test name= '' Parallel Test '' & gt; & lt; classes & gt; & lt; class name= '' com.qa.testcases.ParallelTest '' / & gt; & lt; /classes & gt; & lt; /test & gt; & lt;! -- Test -- & gt; & lt; /suite & gt; & lt;! -- Suite -- & gt;

Step 3:Right click on the testing.xml file and select “ Run As ” - & gt; “ TestNG Suite ”. Observe the time taken to execute both the methods in parallel mode (10204 ms, decreased the executing timeby 8282 ms).

Executing Test Classes in Parallel using TestNG

Step 1:To run classes in parallel mode, create two grade file asChromeTest and FirefoxTestwith three trial methods.

public class ChromeTest {WebDriver driver; @ BeforeTest public nihility setUp () {WebDriverManager.chromedriver () .setup (); driver = new ChromeDriver (); driver.get (`` https: //www.bstackdemo.com/ ''); driver.manage () .window () .maximize ();} @ Test (priority = 1) public void testTitle () {System.out.println (`` The thread ID for testTitle Chrome is `` + Thread.currentThread () .getId ()); Assert.assertEquals (driver.getTitle (), `` StackDemo '');} @ Test (priority = 2) public void clickOffers () throws InterruptedException {System.out.println (`` The thread ID for clickOffers Chrome is `` + Thread.currentThread () .getId ()); WebElement offers=driver.findElement (By.cssSelector (`` a # offers '')); offers.click (); Thread.sleep (2000); WebElement loginBtn=driver.findElement (By.cssSelector (`` button # login-btn '')); Assert.assertTrue (loginBtn.isDisplayed ());} @ Test (priority = 3) public void clickOrders () cast InterruptedException {driver.navigate () .to (`` https: //www.bstackdemo.com/ ''); System.out.println (`` The thread ID for clickOrders Chrome is `` + Thread.currentThread () .getId ()); WebElement orders=driver.findElement (By.cssSelector (`` a # orders '')); orders.click (); Thread.sleep (2000); WebElement loginBtn=driver.findElement (By.cssSelector (`` button # login-btn '')); Assert.assertTrue (loginBtn.isDisplayed ());} @ AfterTest world nullity tearDown () {driver.close ();}} public class FirefoxTest {WebDriver driver; @ BeforeTest public void apparatus () {WebDriverManager.firefoxdriver () .setup (); driver = new FirefoxDriver (); driver.get (`` https: //www.bstackdemo.com/ ''); driver.manage () .window () .maximize ();} @ Test (priority = 1) public void testTitle () {System.out.println (`` The yarn ID for testTitle Firefox is `` + Thread.currentThread () .getId ()); Assert.assertEquals (driver.getTitle (), `` StackDemo '');} @ Test (antecedency = 2) public void clickOffers () throws InterruptedException {System.out.println (`` The thread ID for clickOffers Firefox is `` + Thread.currentThread () .getId ()); WebElement offer = driver.findElement (By.cssSelector (`` a # offers '')); offers.click (); Thread.sleep (3000); WebElement loginBtn = driver.findElement (By.cssSelector (`` button # login-btn '')); Assert.assertTrue (loginBtn.isDisplayed ());} @ Test (priority = 3) public void clickOrders () throws InterruptedException {driver.navigate () .to (`` https: //www.bstackdemo.com/ ''); System.out.println (`` The yarn ID for clickOrders Firefox is `` + Thread.currentThread () .getId ()); WebElement orders=driver.findElement (By.cssSelector (`` a # orders '')); orders.click (); Thread.sleep (2000); WebElement loginBtn=driver.findElement (By.cssSelector (`` button # login-btn '')); Assert.assertTrue (loginBtn.isDisplayed ());} @ AfterTest public void tearDown () {driver.quit ();}}

Step 2: In the testing.xmlfile, add class name and updateparallel value as classesand run it.

& lt;? xml version= '' 1.0 '' encoding= '' UTF-8 ''? & gt; & lt;! DOCTYPE rooms SYSTEM `` https: //testng.org/testng-1.0.dtd '' & gt; & lt; suite name= '' Parallel Test Suite '' parallel= '' classes '' thread-count= '' 2 '' & gt; & lt; test name= '' Parallel Test '' & gt; & lt; classes & gt; & lt; class name= '' com.qa.testcases.ChromeTest '' / & gt; & lt; class name= '' com.qa.testcases.FirefoxTest '' / & gt; & lt; /classes & gt; & lt; /test & gt; & lt;! -- Test -- & gt; & lt; /suite & gt; & lt;! -- Suite -- & gt;

To demonstrate that two classes are running on different threads I have added a code to print the current Thread Id. Note thatChromeTestis scat onThread ID 14 and FirefoxTest is on Thread ID 15.

Obviously, as demonstrate in parallel methods, execution time while running classes in analogue is lesser when classes are run sequentially.

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Executing Test Suites in Parallel using TestNG

To run all the tests usable inside the suite tag in parallel mode, you need to update the “parallel” value as “tests” in testing.xml file.

Here thread-countvalue plays an crucial role because if thread count is less than test, tests postulate to wait for other tests to execute.

Let us understand this by following instance:

Step 1:Create one more class asEdgeTest. ChromeTest, FirefoxTest, and EdgeTestclasses have 3 test methods.

public class EdgeTest {WebDriver driver; @ BeforeTest public vacancy setUp () {WebDriverManager.edgedriver () .setup (); driver = new EdgeDriver (); driver.get (`` https: //www.bstackdemo.com/ ''); driver.manage () .window () .maximize ();} @ Test (precedency = 1) public void testTitle () {System.out.println (`` The thread ID for testTitle Edge is `` + Thread.currentThread () .getId ()); Assert.assertEquals (driver.getTitle (), `` StackDemo '');} @ Test (antecedency = 2) public nothingness clickOffers () throws InterruptedException {System.out.println (`` The thread ID for clickOffers Edge is `` + Thread.currentThread () .getId ()); WebElement offers=driver.findElement (By.cssSelector (`` a # offering '')); offers.click (); Thread.sleep (2000); WebElement loginBtn=driver.findElement (By.cssSelector (`` button # login-btn '')); Assert.assertTrue (loginBtn.isDisplayed ());} @ Test (priority = 3) public void clickOrders () throws InterruptedException {driver.navigate () .to (`` https: //www.bstackdemo.com/ ''); System.out.println (`` The thread ID for clickOrders Edge is `` + Thread.currentThread () .getId ()); WebElement orders=driver.findElement (By.cssSelector (`` a # orders '')); orders.click (); Thread.sleep (2000); WebElement loginBtn=driver.findElement (By.cssSelector (`` button # login-btn '')); Assert.assertTrue (loginBtn.isDisplayed ());} @ AfterTest public void tearDown () {driver.close ();}}

Step 2:Update parallel value astestsand add all the 3 tests intesting.xmlfile. Keep thread count as 2 and run thetesting.xml file.

& lt;? xml version= '' 1.0 '' encoding= '' UTF-8 ''? & gt; & lt;! DOCTYPE suite SYSTEM `` https: //testng.org/testng-1.0.dtd '' & gt; & lt; suite name= '' Parallel Test Suite '' thread-count= '' 2 '' parallel= '' tests '' & gt; & lt; test name= '' Parallel Test Chrome '' & gt; & lt; category & gt; & lt; class name= '' com.qa.testcases.ChromeTest '' / & gt; & lt; /classes & gt; & lt; /test & gt; & lt;! -- Test -- & gt; & lt; test name= '' Parallel Test Firefox '' & gt; & lt; classes & gt; & lt; class name= '' com.qa.testcases.FirefoxTest '' / & gt; & lt; /classes & gt; & lt; /test & gt; & lt;! -- Test -- & gt; & lt; test name= '' Parallel Test Edge '' & gt; & lt; classes & gt; & lt; class name= '' com.qa.testcases.EdgeTest '' / & gt; & lt; /classes & gt; & lt; /test & gt; & lt;! -- Test -- & gt; & lt; /suite & gt; & lt;! -- Suite -- & gt;

When ribbon count is set to2, ChromeTest and FireTestwill execute in parallel on 2 Threads.EdgeTestwill wait for either one of them to accomplish so that it can execute on the loose thread.

You can see from the above console logs, that “ FirefoxTest ” and “ ChromeTest ” ran in parallel on Thread 14 and 15 severally. Later “ EdgeTest ” ran on Thread 15 as it was freed earlier than 14.

If thread count would have been “ 3 ”, all three tests would have run on Thread 14, 15 and 16 respectively in parallel thereby decreasing execution time.

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Threads in TestNG

In TestNG, a thread refers to a separate path of executing that allow multiple test cases to run at the same time. Instead of running tests one after another (consecutive), threads supporter execute them in analogue, which speeds up the overall test run, especially useful for large test suites.

Each thread can run a test method, a course, or even an integral test block independently, without waiting for others to finish. This makes better use of system resources like CPU and memory, reducing entire execution clip.

The number of threads can be controlled using the thread-count dimension in the testng.xml file.

For example,limit thread-count= & # 8221; 3 & # 8243;tells TestNG to run up to three tests at the like time.

Threads are the foundation of parallel execution in TestNG. When used correctly, they help scale screen efficiently across methods, classes, or even browser. However, proper handling is important to avoid number like shared resource conflicts or inconsistent results.

Performance comparison between Serialized and Parallelized test execution in TestNG

Below are the key differences between Serialized and Parallelized test performance in TestNG:

How to Convert a Static WebDriver to Non-Static for Parallel Test Execution in TestNG

The following steps can be used to convert Static WebDriver to Non-Static:

1. Declare WebDriver as a Non-Static Instance Variable:This ensures that each object of the test class holds its own WebDriver instance.

public WebDriver driver;

2. Initialize WebDriver in @ BeforeMethod or @ BeforeClass:The @ BeforeMethod notation ensures a new browser representative is created for each test method when running in parallel.

@ BeforeMethod public void setup () {driver = new ChromeDriver ();}

3. Use Instance Driver Inside Test Methods:This ensure that each test method go independently, apply the right browser illustration created specifically for its own performance ribbon.

@ Test public void openHomePage () {driver.get (`` https: //example.com ''); // additional test steps}

4. Quit WebDriver in @ AfterMethod:This ensures that each browser session is closed decent after test execution.

@ AfterMethod public vacancy tearDown () {if (driver! = null) {driver.quit ();}}

5. Using ThreadLocal for Safer: For more control in multi-threaded execution, especially in frameworks using Page Object Model,ThreadLocal & lt; WebDriver & gt;can be used to isolate WebDriver instances per thread:

public stratum DriverManager {private static ThreadLocal & lt; WebDriver & gt; driver = new ThreadLocal & lt; & gt; (); public still WebDriver getDriver () {return driver.get ();} public static void setDriver (WebDriver driverInstance) {driver.set (driverInstance);} public static void quitDriver () {if (driver.get ()! = null) {driver.get () .quit (); driver.remove ();}}}

To set up ThreadLocal WebDriver, use the next step:

Step 1: Initialize in Setup

@ BeforeMethod public void frame-up () {WebDriver localDriver = new ChromeDriver (); DriverManager.setDriver (localDriver);}

Step 2: Access in Test

DriverManager.getDriver () .get (``https: //google.com");

Parallel Test Execution Using DataProviders in TestNG

Follow these steps to run parallel tests using DataProviders in TestNG:

Step 1: Create a DataProvider with Parallel Set to True

Define the data in a method annotated with@ DataProvider. Set parallel = trueso that TestNG knows to run each data set in a separate yarn.

@ DataProvider (gens = `` loginData '', parallel = true) public Object [] [] getData () {return new Object [] [] {{`` user1 '', `` pass1 ''}, {`` user2 '', `` pass2 ''}, {`` user3 '', `` pass3 ''}};}

Step 2: Link the Test Method to the DataProvider

Use the dataProvider attribute in the@ Test annotationto feed the exam method with the data. Each test run gets a unique username-password duad and runs in parallel.

@ Test (dataProvider = `` loginData '') public void testLogin (String username, String parole) {WebDriver driver = new ChromeDriver (); driver.get (`` https: //google.com/login ''); // perform login steps driver.quit ();}

Step 3: Set Thread Count in testng.xml (Optional but Recommended)

Define how many threads can run in parallel by configure the suite file. This allows TestNG to run multiple test methods with different data at the same time.

& lt; suite name= '' ParallelDataProvider '' parallel= '' methods '' thread-count= '' 3 '' & gt; & lt; test name= '' LoginTest '' & gt; & lt; classes & gt; & lt; class name= '' com.test.LoginTest '' / & gt; & lt; /classes & gt; & lt; /test & gt; & lt; /suite & gt;

Parallel Test Execution in Multiple Browsers Using TestNG for Selenium Automation Testing

Running the like test cases across different browsers is a common requirement in cross-browser testing. TestNG makes this easy by let parallel executing using XML configuration and parameterization, so tests can be executed in multiple browser at the same clip, saving time and ascertain encompassing coverage.

Follow These Steps to Set Up Parallel Test Execution Across Browsers:

Step 1: Create a Test Method That Accepts the Browser Name

Use @ Parameters to pass the browser eccentric dynamically and found the appropriate driver.

@ Parameters (`` browser '') @ BeforeMethod public void setup (String browser) {if (browser.equalsIgnoreCase (`` chrome '')) {driver = new ChromeDriver ();} else if (browser.equalsIgnoreCase (`` firefox '')) {driver = new FirefoxDriver ();} else if (browser.equalsIgnoreCase (`` edge '')) {driver = new EdgeDriver ();}}

Step 2: Write the Test Case

Use the driver instance in the exam as usual.

@ Test public void openHomePage () {driver.get (`` https: //google.com ''); // perform actions or validations}

Step 3: Clean Up After Test Execution

Always close the browser after trial completion.

@ AfterMethod public nihility tearDown () {if (driver! = null) {driver.quit ();}}

Step 4: Define Browsers in testng.xml and Enable Parallel Execution

In the XML file, define each browser under a separate & lt; exam & gt; block and enable parallel execution.

& lt; suite name= '' CrossBrowserSuite '' parallel= '' examination '' thread-count= '' 3 '' & gt; & lt; test name= '' ChromeTest '' & gt; & lt; parameter name= '' browser '' value= '' chrome '' / & gt; & lt; classes & gt; & lt; class name= '' com.test.CrossBrowserTest '' / & gt; & lt; /classes & gt; & lt; /test & gt; & lt; test name= '' FirefoxTest '' & gt; & lt; parameter name= '' browser '' value= '' firefox '' / & gt; & lt; course & gt; & lt; class name= '' com.test.CrossBrowserTest '' / & gt; & lt; /classes & gt; & lt; /test & gt; & lt; test name= '' EdgeTest '' & gt; & lt; parameter name= '' browser '' value= '' edge '' / & gt; & lt; classes & gt; & lt; family name= '' com.test.CrossBrowserTest '' / & gt; & lt; /classes & gt; & lt; /test & gt; & lt; /suite & gt;

Challenges of Parallel Test Execution in TestNG

Some of the challenges of parallel test execution in TestNG include:

• Shared WebDriver conflicts:Multiple threads accessing a single driver illustration can cause unexpected failure.
• Data hit:Tests modifying the same data files, databases or config settings may lead to discrepant results.
• Thread refuge issue:Shared objects or non-thread-safe utilities can behave unpredictably when accessed by multiple togs.
• Complex debugging:Simultaneous failure can generate overlap log, making it hard to trace issues.
• High resource usage:Running too many threads can strain system memory and CPU, leading to crashes or slowdowns.
• Timing and synchronism problems:Dynamic elements may not load as expected when tests fulfil simultaneously.
• Test order capriciousness:Dependant trial may break if executed in a different order due to parallel programing.
• Improper Test Isolation:Tests that rely on shared state, static variables, or global config can interfere with each other when run in analogue, leading to flaky results.
• Setup and Teardown Conflicts:If setup (@ BeforeClass, @ BeforeMethod) or teardown (@ AfterClass, @ AfterMethod) logic isn ’ t thread-safe, it can lead to unexpected behavior or resource cleanup issues during parallel runs.

To handle these challenges effectively, squad need a test infrastructure that supports stable, scalable parallel performance across a all-embracing ambit of real browsers and devices.

Platforms like BrowserStack Automate get this easier by providing the dependability and coverage required to run large TestNG entourage in parallel with self-confidence.

Scale Your TestNG Parallel Execution with BrowserStack Automate

Running parallel tests locally can quickly become circumscribed by ironware capacity, browser availability, and maintenance overhead. BrowserStack Automate solves these challenges by providing a cloud-based testing program contrive to execute large TestNG rooms in parallel across real device and real browsers.

Key Benefits of Using BrowserStack Automate for Parallel Execution

• Insistent Scalability:Run hundreds of parallel TestNG threads without worry about local scheme limitations.
• Existent Browsers and Devices:Test on the modish versions of Chrome, Firefox, Edge, Safari, and existent wandering devices for accurate user coverage.
• Faster Execution Times:Parallelize exam runs across a distributed cloud substructure to significantly reduce overall test duration.
• Built-in Debugging Artifacts:Access screenshots, video recordings, console logs, network logs, and performance information for every test session.
• Stable and Secure Infrastructure:Avoid flaky results caused by local machine constraints or discrepant browser apparatus.
• Seamless Integration:Plug Automate into, GitHub Actions,, Bamboo, and former CI systems for continuous, parallel testing at scale.

Using BrowserStack Automate grant squad to unlock the total potential of TestNG ’ s parallel execution capabilities, ensuring faster feedback, best coverage, and more dependable testing at scale.

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Conclusion

Sequential testing is clip consuming and therefore, parallel testing is required to minify the performance time and cover more device, browsers, platforms under test. With enhancement and innovations in the engineering field, society are frequently launching new devices, browser/ update browsers and platforms to yield a best user experience. It become dispute for a examiner to test against all such combinations and on the early handwriting it is obligatory to test that too.

BrowserStack offers 3500+ existent device and browser to help attain in parallel using Selenium through its. today to have a seamless experience while running parallel test!

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