Parallel Testing with TestNG

 🚀 What is Parallel Testing?

Parallel testing means running multiple tests at the same time instead of one after the other. This helps save time, especially when you have a large test suite.


🧪 What is TestNG?

TestNG is a popular testing framework in Java. It supports features like annotations, grouping, and parallel execution out of the box.


⚙️ How to Do Parallel Testing in TestNG?

You can run tests in parallel by using the testng.xml configuration file or by setting it programmatically.


✅ Method 1: Using testng.xml

Here's an example:


xml

Copy

Edit

<suite name="ParallelTestSuite" parallel="tests" thread-count="2">

    <test name="Test1">

        <classes>

            <class name="com.example.TestClass1"/>

        </classes>

    </test>


    <test name="Test2">

        <classes>

            <class name="com.example.TestClass2"/>

        </classes>

    </test>

</suite>

Explanation:

parallel="tests" → Runs each <test> tag in parallel.


thread-count="2" → Runs two tests at the same time.


You can also use parallel="classes" or parallel="methods".


✅ Method 2: Programmatically (Optional)

You can also configure parallel testing using Java code and the TestNG API, but testng.xml is the more common approach.


🔄 Different Parallel Options

Value of parallel What It Does

tests Runs test blocks in parallel

classes Runs test classes in parallel

methods Runs test methods in parallel

instances Runs different instances of a class


📌 Best Practices

Make sure your tests are independent (don’t rely on shared state).


Avoid static variables or shared resources unless synchronized.


Use thread-safe tools like ThreadLocal if needed.


✅ Benefits of Parallel Testing

Saves time by running tests faster.


Improves efficiency in CI/CD pipelines.


Useful for cross-browser testing or data-driven testing.

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