✅ Using TestNG with Selenium: Why and How

Selenium is a powerful tool for automating browser actions. But on its own, Selenium doesn’t provide features like test execution flow, grouping, parallel runs, or reporting.

That’s where TestNG comes in.

📌 What Is TestNG?

TestNG (Test Next Generation) is a testing framework for Java, inspired by JUnit and NUnit, but with more powerful features, such as:

Annotations to control test flow

Flexible test configuration

Test grouping and prioritization

Parallel test execution

HTML/XML reports

Integration with tools like Maven, Jenkins, and CI/CD

🤔 Why Use TestNG with Selenium?

Feature Benefit

Test organization Write clean, modular test cases

Test prioritization Control the order of test execution

Data-driven testing Easily run tests with multiple inputs

Parallel execution Speed up testing across browsers/tabs

Reporting Get detailed test reports automatically

🚀 How to Use TestNG with Selenium (Step-by-Step)

🔧 1. Set Up a Selenium + TestNG Project

You can create a Maven project and include the dependencies in pom.xml.

xml

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<dependencies>

  <!-- Selenium -->

  <dependency>

    <groupId>org.seleniumhq.selenium</groupId>

    <artifactId>selenium-java</artifactId>

    <version>4.19.0</version>

  </dependency>

  <!-- TestNG -->

  <dependency>

    <groupId>org.testng</groupId>

    <artifactId>testng</artifactId>

    <version>7.10.1</version>

    <scope>test</scope>

  </dependency>

</dependencies>

✍️ 2. Create a Simple Test Class

java

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import org.openqa.selenium.WebDriver;

import org.openqa.selenium.chrome.ChromeDriver;

import org.testng.annotations.AfterClass;

import org.testng.annotations.BeforeClass;

import org.testng.annotations.Test;

public class GoogleTest {

    WebDriver driver;

    @BeforeClass

    public void setUp() {

        driver = new ChromeDriver();

        driver.get("https://www.google.com");

    }

    @Test

    public void checkTitle() {

        String title = driver.getTitle();

        assert title.contains("Google");

    }

    @AfterClass

    public void tearDown() {

        driver.quit();

    }

}

🧪 3. Run the Test

You can run your tests:

From your IDE (like IntelliJ or Eclipse)

Using the TestNG XML file for configuration

Via Maven or CI/CD tools (like Jenkins)

🗂️ 4. Use TestNG XML to Organize Tests

Create a testng.xml file:

xml

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<!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd">

<suite name="My Test Suite">

  <test name="Google Tests">

    <classes>

      <class name="GoogleTest"/>

    </classes>

  </test>

</suite>

Run it with:

bash

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mvn test -DsuiteXmlFile=testng.xml

🔍 Common TestNG Annotations

Annotation Purpose

@BeforeClass Runs once before the first test method

@AfterClass Runs after all test methods are done

@BeforeMethod Runs before each test method

@AfterMethod Runs after each test method

@Test Marks a method as a test case

@DataProvider Supplies data to test methods (for loops)

@Parameters Used for parameterizing test values

🧠 Tips & Best Practices

Use @DataProvider for data-driven testing (e.g., login with different users)

Group tests with groups attribute to control test execution

Use assertions (Assert.assertTrue(), Assert.assertEquals()) to validate behavior

Use listeners or ITestListener for custom reporting or logging

📘 Summary

Tool Purpose

Selenium Automates browser actions

TestNG Manages test execution, flow, and reports

Combining Selenium + TestNG gives you a powerful test automation framework for UI testing, regression, and continuous integration.

Learn Selenium JAVA Training in Hyderabad

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