Upgrade from Selenium 3 to 4: An Expert‘s Guide

ByBrian Lucas

Have you heard the buzz around Selenium 4 but aren‘t quite sure what it means for you as a tester? Well, you‘ve come to the right place!

As an app and browser testing expert with over a decade of experience across 3500+ real devices and browsers, I‘ve been eagerly anticipating the Selenium 3 to 4 transition. This major update introduces key improvements that can take your test automation to the next level.

In this detailed guide, we‘ll explore what‘s new and how to upgrade your frameworks to Selenium 4. I‘ll also share best practices to help you take full advantage of the capabilities now available.

What Does the Selenium 3 to 4 Shift Entail?

Before we dig into the changes, let‘s briefly recap Selenium‘s purpose. Selenium is an open-source test automation framework used by developers and testers to validate web apps across different browsers and operating systems.

Selenium WebDriver enables control and scripting of browser actions while Selenium Grid facilitates distributed testing across networks of machines.

So why is Selenium 4 generating so much hype despite still being in alpha? Well, after 5+ years, Selenium 3 is showing its age. The updates in Selenium 4 align with the latest web standards and testing needs.

As quoted by Selenium expert Dave Haeffner, Selenium 4 represents "the first big step forward in years."

My prediction based on decades in the industry? Over 75% of Selenium users will upgrade to version 4 once it hits general availability. The capabilities unlocked are that significant for streamlining test creation and maintenance.

Now let‘s explore exactly what‘s new and changed in Selenium 4!

Main Updates in Selenium 4

I‘ll be referencing Selenium 3 frequently, so take a minute to brush up if you need a refresher on its core components like WebDriver, Grid, and IDE.

1. WebDriver W3C Standardization

This shift modernizes communication between browser drivers and Selenium, facilitating direct WebDriver-browser integration. How exactly?

In Selenium 3, the intermediary JSON Wire Protocol encoded messages between drivers and browsers. This added latency and overhead.

Selenium 4 adopts the industry-standard W3C protocol used natively by most drivers. Removing that impedance mismatch enables faster, more reliable execution across browser and device combinations.

As a result, Selenium Foundation has deprecated support for Opera and PhantomJS in version 4 since their WebDriver development has stalled. But the upside is huge for those using current mainstream browsers!

Here‘s a comparison of the Selenium 3 vs 4 architectures:

Selenium 3 Selenium 4
JSON Wire Protocol encodes messages Direct W3C WebDriver-Browser integration
Extra encoding/decoding latency No intermediary protocol, faster execution
Support for Opera, PhantomJS Dropped support for Opera, PhantomJS

This table summarizes the difference clearly, no? Feel free to reference as needed!

2. Massive Improvements to Selenium IDE

Selenium IDE has traditionally served a niche audience given limitations as a Firefox add-on. But with Selenium 4, IDE has been re-architected for the mainstream.

Let‘s contrast some key capabilities:

Selenium 3 IDE

  • Firefox extension only
  • Minimal native features beyond test recorder

Selenium 4 IDE

  • Available as Chrome and Edge extensions
  • Equipped with Selenium IDE Runner (SIDE) for CI/CD integration
  • Export testsuite as code across multiple languages
  • Enables parallel test distribution through integration with Selenium Grid
  • Debugging capabilities

The user-friendly IDE can now serve as an on-ramp for less technical team members through ease of generating reusable test cases. The seamless CI/CD integration likewise facilitates incorporation into mature dev workflows.

No surprise that downloads of the Selenium IDE Chrome extension have surpassed 200,000 already! I anticipate continued growth as Selenium 4 adoption increases.

3. Consolidated, Cloud-Ready Selenium Grid

Selenium Grid powers distributed test execution across networks of systems. It underpins both at-scale automated validation and manual real device testing.

In Selenium 3, significant manual configuration of Grid elements was required:

  • Separate installation of Hub and Node/s
  • Static configuration of nodes and max counts

This led to brittle Grid deployments requiring constant tuning.

The refreshed Grid architecture in Selenium 4 combines Hub and Node functions into a single binary. This simplifies getting started for a fledgling grid.

Additional improvements include:

  • Dynamic node registration
  • Enhanced UI for managing Grid clusters
  • Built-in Docker configuration
  • Secure HTTPS connectivity

These updates along with augmentations like IVP6 lead to a Cloud-ready model optimal for leveraging systems like AWS Device Farm. Expect further cloud alignment before final release.

4. Chrome DevTools Integration Unlocks New Testing Paradigms

This addition opens the door to harnessing the power of Chrome Developer Tools within test automation. Native access eliminates external dependencies.

Concretely this manifests as:

Faster Debugging

  • Inspect page elements
  • Set conditional breakpoints
  • Hot-update code

Geolocation and Device Testing

  • Trigger custom location coordinates
  • Network traffic shaping (throttling)
  • Override user agent signatures

Deeper Performance Monitoring

  • CPU/Memory profiling
  • JavaScript heap snapshots
  • Frame rate and UI responsiveness audits

The possibilities stretch even further via Lighthouse integration in upcoming Selenium versions.

I‘ll be publishing hands-on guides on leveraging these APIs over the coming months! Let me know what topics interest you most.

5. Relative Locators Simplify Element Targeting

Anyone working extensively with Selenium knows the pain and brittleness of traditional DOM-based element locators:

  • Frequent locator breakdowns amid site changes
  • Long chained XPaths
  • Need to re-record selectors across contexts

Relative locators realign element targeting by finding nodes relative to other nodes.

For example, identify the next text input below the password field instead of via absolute coordinates. Or choose the menu item to the right of the search icon rather than brittle XPath.

The W3C introducing relative locating opens the door to less flaky tests relying on element proximity vs absolute references.

Here is an example leveraging above() and toRightOf():

// Traditional absolute locator  
driver.findElement(By.id("absoluteId")); 

// Relative locator using other elements
WebElement passwordField = driver.findElement(By.id("password"));
WebElement searchIcon = driver.findElement(By.id("search")); 

WebElement emailField = driver.findElement(with(By.tagName("input")).above(passwordField));

WebElement menuOption = driver.findElement(with(By.tagName("button")).toRightOf(searchIcon));

This just scratches the surface of the possibilities! I‘ll be writing tutorials on relative locators soon – subscribe if interested.

6. Transition from DesiredCapabilities to Options Classes

When configuring WebDriver instances, we leverage various options around browser selection, headless mode, proxies etc.

These were configured in Selenium 3 via DesiredCapabilities passed to driver constructors.

With Selenium 4, DesiredCapabilities have been superseded by more flexible Options classes tied to each driver.

So previously you may have written:

DesiredCapabilities caps = new DesiredCapabilities();
caps.setBrowserName("chrome");
caps.setPlatform("windows");

WebDriver driver = new ChromeDriver(caps);

The updated approach utilizes ChromeOptions:

ChromeOptions options = new ChromeOptions();
options.addArguments("headless");
options.addArguments("window-size=1280,800");

WebDriver driver = new ChromeDriver(options);

This pattern is cleaner and allows specifying arguments beyond what DesiredCapabilities supported.

The new Options classes include:

  • ChromeOptions
  • FirefoxOptions
  • InternetExplorerOptions
  • EdgeOptions
  • SafariOptions

I suggest encapsulating these configurations into factory methods or builders to simplify test creation.

7. Enhanced User Action API

Common test scenarios involve complex user interactions like hover, drag and drop, context click etc. These were enabled in Selenium 3 via the Actions class but required messy chains.

Selenium 4 adds new methods directly to Actions like:

  • click()
  • doubleclick()
  • contextclick()
  • select()

This leads to cleaner handling of keyboard and mouse events:

Actions actions = new Actions(driver);

WebElement source = driver.findElement(By.id("draggable"));
WebElement target = driver.findElement(By.id("droppable"));

actions
  .clickAndHold(source)
  .moveToElement(target)
  .release()
  .perform();

No longer do you need the long sequence of moveToElement(), clickAndHold(), release() etc!

8. FluentWait and Duration Refactoring

The utility FluentWait class uses a "retry-until" approach to locate elements:

// Retry finding element for 30 seconds
Wait<WebDriver> wait = new FluentWait<WebDriver>(driver)
  .withTimeout(30, SECONDS); 

// Check for element every 1 second  
wait.pollingEvery(1, SECONDS);  

WebElement dynamicElement = wait.until(new Function<>() {
  // ... 
});

Previously, the duration arguments relied on integer + TimeUnit tuples.

Updated FluentWait methods now accept modern Java Duration objects:

// Fluently create duration
Duration timeout = Duration.ofSeconds(30);

Wait<WebDriver> wait = new FluentWait<WebDriver>(driver)
  .withTimeout(timeout)
  .pollingEvery(Duration.ofSeconds(1));

This aligns better with Java 8+ date/time handling.

Migrating Your Test Frameworks to Selenium 4

Now that you understand the core updates in Selenium 4, let‘s get our hands dirty with upgrade instructions.

Option 1: Maven Dependency Update

For Java tests using Maven builds, migrate by updating the Selenium dependency version.

1. Open pom.xml

2. Modify the Selenium dependency to 4.0.0-alpha-6 

<!-- https://mvnrepository.com/artifact/org.seleniumhq.selenium/selenium-java -->
<dependency>
    <groupId>org.seleniumhq.selenium</groupId>
    <artifactId>selenium-java</artifactId>
    <version>4.0.0-alpha-6</version>
</dependency>

3. Save changes and rebuild

Once project recompilation completes, you can start taking advantage of Selenium 4 features.

Option 2: Gradle Version Update

The process is similar for Gradle managed Java/Kotlin tests:

1. Open build.gradle

2. Set Selenium version to 4 alpha

dependencies {
  testCompile group: ‘org.seleniumhq.selenium‘, name: ‘selenium-java‘, version: ‘4.0.0-alpha-6‘
}

3. Save changes and run gradle build

And you should now have your framework building against Selenium 4!

Option 3: Manual Installation

You can also manually download Selenium 4 JARs and configure Java projects against them:

1. Download Selenium 4.0 Alpha JARs:

2. Add JARs to your Java project classpath

With the classpath configured, Selenium 4 packages and classes will be available.

Best Practices for Migrating Test Suites

When transitioning existing test suites, keep these best practices in mind:

Incrementally Port Core Sections

Don‘t feel compelled to rewrite all tests on day one! Migrate high value areas first while leaving other sections on Selenium 3 until later.

Isolate Browser-Specific Code

Encapsulate browser construction and configuration via factory methods or builders. This limits refactoring needed if removing certain browsers.

Adopt Relative Locators

Augment existing page object models with relative locators for more robust selectors. But don‘t blindly replace all locators yet.

Learn New APIs with Test Cases

Explore Selenium 4 capabilities by creating new test cases leveraging features like developer tools and relative locators.

Focusing on high-return areas first while limiting initial scope risk allows methodically unlocking Selenium 4‘s potential.

Over time, you can modernize all test code to remove legacy Selenium 3 cruft. But no need for a big bang rewrite!

Combining Selenium with Cloud Testing Services

While Selenium provides excellent local browser test orchestration, solely relying on it leaves potential coverage gaps.

Complementary cloud testing services like BrowserStack offer these further benefits:

  • Cross-platform validation across 3000+ real mobile devices and desktop browsers
  • Geographic distribution by testing from global data centers
  • Productivity acceleration via parallel test execution
  • Burstable capacity to scale test runs on demand
  • Advanced reporting for test analytics

I suggest investigating integrated solutions to expand Selenium capabilities for true end-to-end testing.

Key Takeaways from Our Selenium 4 Upgrade Guide

We‘ve covered a ton of ground when it comes to Selenium 4 – from new features to installation to cloud integration.

Let‘s recap the key takeaways:

  • Selenium 4 introduces long-awaited improvements around browser communication, Grid, IDE, Chrome DevTools and more
  • Direct WebDriver-browser integration via the standardized W3C protocol enables faster and more reliable execution
  • Upgraded IDE unlocks support for test recording, export and debugging across browsers
  • Consolidated Grid architecture simplifies configuration while being Cloud ready
  • Options pattern supersedes DesiredCapabilities for cleaner test configuration
  • Relative locators reduce test maintenance by relying on element proximity vs. absolute coordinates
  • Upgrade via Maven/Gradle by updating Selenium version or manual JAR installation
  • Methodically migrate legacy tests while isolating browser-specific logic
  • Pair with cloud testing for cross-platform coverage and scale

I hope you‘ve found this guide useful! Please reach out with any other topics you want me to cover related to Selenium and test automation.

And as always, happy testing!

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