Why multi-browser testing ensures reach in Selenium Java - Automation Benefits in Action

Verify website functionality on multiple browsers

Preconditions (2)

Step 1: Open Chrome browser

Step 2: Navigate to the test website URL

Step 3: Verify the homepage loads successfully

Step 4: Check that the main menu is visible

Step 5: Click on the 'Contact Us' link

Step 6: Verify the Contact Us page loads

Step 7: Close Chrome browser

Step 8: Repeat the above steps for Firefox browser

Step 9: Repeat the above steps for Edge browser

✅ Expected Result: The website loads and functions correctly on Chrome, Firefox, and Edge browsers without errors

Automation Requirements - Selenium WebDriver with TestNG

Assertions Needed:

Homepage title is correct

Main menu element is displayed

Contact Us page title is correct

Best Practices:

Use WebDriverManager to manage browser drivers

Use explicit waits for element visibility

Implement parameterized tests to run on multiple browsers

Use Page Object Model for maintainability

Automated Solution

Selenium Java

import io.github.bonigarcia.wdm.WebDriverManager;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.edge.EdgeDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.WebDriverWait;
import org.testng.Assert;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Parameters;
import org.testng.annotations.Test;

import java.time.Duration;

public class MultiBrowserTest {
    private WebDriver driver;
    private WebDriverWait wait;
    private final String baseUrl = "https://example.com";

    @Parameters({"browser"})
    @BeforeMethod
    public void setUp(String browser) {
        switch (browser.toLowerCase()) {
            case "chrome" -> {
                WebDriverManager.chromedriver().setup();
                driver = new ChromeDriver();
            }
            case "firefox" -> {
                WebDriverManager.firefoxdriver().setup();
                driver = new FirefoxDriver();
            }
            case "edge" -> {
                WebDriverManager.edgedriver().setup();
                driver = new EdgeDriver();
            }
            default -> throw new IllegalArgumentException("Unsupported browser: " + browser);
        }
        driver.manage().window().maximize();
        wait = new WebDriverWait(driver, Duration.ofSeconds(10));
    }

    @Test
    public void testWebsiteFunctionality() {
        driver.get(baseUrl);

        // Verify homepage title
        String expectedHomeTitle = "Example Domain";
        wait.until(ExpectedConditions.titleIs(expectedHomeTitle));
        Assert.assertEquals(driver.getTitle(), expectedHomeTitle, "Homepage title mismatch");

        // Verify main menu is visible
        By mainMenuLocator = By.id("main-menu");
        WebElement mainMenu = wait.until(ExpectedConditions.visibilityOfElementLocated(mainMenuLocator));
        Assert.assertTrue(mainMenu.isDisplayed(), "Main menu is not visible");

        // Click Contact Us link
        By contactUsLinkLocator = By.linkText("Contact Us");
        WebElement contactUsLink = wait.until(ExpectedConditions.elementToBeClickable(contactUsLinkLocator));
        contactUsLink.click();

        // Verify Contact Us page title
        String expectedContactTitle = "Contact Us - Example Domain";
        wait.until(ExpectedConditions.titleIs(expectedContactTitle));
        Assert.assertEquals(driver.getTitle(), expectedContactTitle, "Contact Us page title mismatch");
    }

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

This test uses TestNG with Selenium WebDriver to automate the manual test case.

Setup: The @Parameters annotation allows running the test on different browsers by passing the browser name. WebDriverManager automatically downloads and sets up the correct driver for Chrome, Firefox, or Edge.

Test steps: The test opens the website URL, waits explicitly for the homepage title to confirm the page loaded, checks the main menu is visible, clicks the 'Contact Us' link, and verifies the Contact Us page title.

Assertions: We assert the page titles and visibility of the main menu to confirm correct loading and navigation.

Teardown: The browser closes after each test to clean up.

This approach ensures the same test runs on multiple browsers, verifying the website works correctly across them, which is why multi-browser testing ensures reach.

Common Mistakes - 4 Pitfalls

Hardcoding browser driver paths instead of using WebDriverManager

Using Thread.sleep() instead of explicit waits

Not parameterizing tests for multiple browsers

Using brittle locators like absolute XPaths

Bonus Challenge

Now add data-driven testing with 3 different URLs to verify multi-browser testing on multiple environments

Show Hint

Practice

1. Why is multi-browser testing important in Selenium Java testing?

easy

A. It only tests the website on Chrome browser.

B. It speeds up the test execution time.

C. It reduces the number of test cases needed.

D. It ensures the website works correctly on different browsers.

Solution

1. Step 1: Understand the purpose of multi-browser testing

   Multi-browser testing checks if a website behaves correctly across different browsers like Chrome, Firefox, and Edge.

2. Step 2: Identify the benefit of multi-browser testing

   This testing ensures all users, regardless of their browser choice, have a good experience.

3. Final Answer:

   It ensures the website works correctly on different browsers. -> Option D

4. Quick Check:

   Multi-browser testing = cross-browser compatibility [OK]

Hint: Think about users using different browsers [OK]

Common Mistakes:

• Confusing speed with compatibility
• Assuming testing only on Chrome is enough
• Believing it reduces test cases

2. Which of the following is the correct way to create a WebDriver instance for Firefox in Selenium Java?

easy

A. WebDriver driver = new InternetExplorerDriver();

B. WebDriver driver = new FirefoxDriver();

C. WebDriver driver = new SafariDriver();

D. WebDriver driver = new ChromeDriver();

Solution

1. Step 1: Identify the correct WebDriver class for Firefox

   The Firefox browser uses the FirefoxDriver class in Selenium Java.

2. Step 2: Match the syntax for creating the driver instance

   The correct syntax is: WebDriver driver = new FirefoxDriver();

3. Final Answer:

   WebDriver driver = new FirefoxDriver(); -> Option B

4. Quick Check:

   FirefoxDriver creates Firefox browser instance [OK]

Hint: Match browser name with driver class name [OK]

Common Mistakes:

• Using ChromeDriver for Firefox
• Confusing driver class names
• Missing 'new' keyword

3. What will be the output of the following Selenium Java code snippet?

WebDriver chromeDriver = new ChromeDriver();
WebDriver firefoxDriver = new FirefoxDriver();
chromeDriver.get("https://example.com");
firefoxDriver.get("https://example.com");
System.out.println(chromeDriver.getTitle().equals(firefoxDriver.getTitle()));

medium

A. true

B. false

C. null

D. Compilation error

Solution

1. Step 1: Understand the code flow

   Both drivers open the same URL 'https://example.com'. Then, the titles of both pages are compared.

2. Step 2: Predict the title comparison result

   Since both browsers load the same page, their titles should be identical, so equals() returns true.

3. Final Answer:

   true -> Option A

4. Quick Check:

   Same URL titles match = true [OK]

Hint: Same URL means same title usually [OK]

Common Mistakes:

• Assuming different browsers change title
• Expecting false due to browser difference
• Thinking code has syntax errors

4. Identify the error in the following Selenium Java code for multi-browser testing:

WebDriver driver;
driver = new ChromeDriver();
driver.get("https://example.com");
driver = new FirefoxDriver();
driver.get("https://example.com");

medium

A. Reusing the same driver variable causes the Chrome browser reference to be lost before Firefox opens.

B. Missing import statements for WebDriver classes.

C. The get() method is called incorrectly.

D. Cannot create multiple WebDriver instances in one program.

Solution

1. Step 1: Analyze driver variable usage

   The same 'driver' variable is assigned first to ChromeDriver, then overwritten by FirefoxDriver.

2. Step 2: Understand browser session impact

   When driver is reassigned, the Chrome browser reference is lost, so tests run sequentially, not in parallel.

3. Final Answer:

   Reusing the same driver variable causes the Chrome browser reference to be lost before Firefox opens. -> Option A

4. Quick Check:

   One driver variable overwrites previous browser reference [OK]

Hint: Use separate variables for each browser [OK]

Common Mistakes:

• Thinking multiple drivers can't be created
• Assuming get() method is wrong
• Ignoring variable reassignment effects

5. You want to test a website on Chrome, Firefox, and Edge browsers simultaneously using Selenium Java. Which approach best ensures full reach and efficient testing?

hard

A. Run tests sequentially on each browser using the same WebDriver variable.

B. Use only ChromeDriver since it covers most users.

C. Create separate WebDriver instances for each browser and run tests in parallel threads.

D. Test only on Firefox and Edge to save time.

Solution

1. Step 1: Understand multi-browser testing goals

   Testing on multiple browsers ensures the website works for all users regardless of browser choice.

2. Step 2: Choose an efficient testing method

   Creating separate WebDriver instances for each browser and running tests in parallel saves time and covers all browsers.

3. Final Answer:

   Create separate WebDriver instances for each browser and run tests in parallel threads. -> Option C

4. Quick Check:

   Parallel multi-browser testing = full reach + efficiency [OK]

Hint: Use parallel threads with separate drivers [OK]

Common Mistakes:

• Testing only one browser
• Reusing same driver variable sequentially
• Skipping popular browsers