Why TestNG structures test execution in Selenium Java - Test Execution Impact

Test Overview

This test opens a web page, clicks a login button, and verifies the login form appears. It shows how TestNG structures test steps and assertions to organize test execution clearly.

Test Code - TestNG

Selenium Java

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;
import org.testng.Assert;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

public class LoginTest {
    WebDriver driver;

    @BeforeClass
    public void setUp() {
        driver = new ChromeDriver();
        driver.manage().window().maximize();
    }

    @Test
    public void testLoginButtonShowsForm() {
        driver.get("https://example.com");
        WebElement loginButton = driver.findElement(By.id("login-btn"));
        loginButton.click();
        WebElement loginForm = driver.findElement(By.id("login-form"));
        Assert.assertTrue(loginForm.isDisplayed(), "Login form should be visible after clicking login button");
    }

    @AfterClass
    public void tearDown() {
        driver.quit();
    }
}

Execution Trace - 6 Steps

Step	Action	System State	Assertion	Result
1	TestNG @BeforeClass runs: opens Chrome browser and maximizes window	Browser window is open and maximized, ready for navigation	-	PASS
2	TestNG @Test runs: navigates to https://example.com	Browser displays the homepage of example.com	-	PASS
3	Finds login button by id 'login-btn' using driver.findElement	Login button element is located on the page	-	PASS
4	Clicks the login button	Login form appears on the page after click	-	PASS
5	Finds login form by id 'login-form'	Login form element is located and visible	Assert that login form is displayed	PASS
6	TestNG @AfterClass runs: closes the browser	Browser is closed, test session ends	-	PASS

Failure Scenario

Failing Condition: Login form element with id 'login-form' is not found or not visible after clicking login button

Execution Trace Quiz - 3 Questions

What does the @BeforeClass method do in this TestNG test?

A Opens and prepares the browser before tests run

B Clicks the login button

C Verifies the login form is visible

D Closes the browser after tests

Key Result

TestNG structures test execution by clearly separating setup, test actions, assertions, and cleanup using annotations. This makes tests organized, readable, and easier to maintain.