Automation testing has become essential in the fast-paced world of software development. One tool that has gained significant attention in recent times is Playwright. This post will explore how Playwright can help you boost your efficiency and provide some practical samples to get you started. 

What is Playwright?

Playwright is an open-source automation framework that allows QA Engineers to automate web applications. Next, we will go into more detail regarding the efficiency-boosting features offered by Playwright.

Cross-Browser Compatibility

Traditional tools and frameworks often had browser-specific APIs that required QA engineers to write separate code for each targeted browser.

Playwright provides a unified API that remains consistent across different browsers. This means you can use the same code and commands to automate tasks and interact with web elements, regardless of the browser used. With a single codebase, you can test your web applications on Chromium, WebKit, and Firefox. This eliminates the need for maintaining separate test scripts for each browser, saving valuable time. 

const { chromium, firefox, webkit } = require('playwright');

(async () => {
  for (const browserType of [chromium, firefox, webkit]) {
    const browser = await browserType.launch();
    const context = await browser.newContext();
    const page = await context.newPage();

    await page.goto('https://www.example.com');
    // Perform other test actions

    await browser.close();
  }
})();

As we can see, this code iterates over an array of browser types, launches each browser, and performs the same actions on each browser instance.

Parallel Test Execution

Playwright’s Parallel Test Execution feature allows running tests simultaneously across multiple browser instances, making testing faster and more efficient. It doesn’t matter if you want to run several tests together in one browser or test on different browsers simultaneously.

Setting up Parallel Test Execution is relatively straightforward and convenient compared to many other testing tools. Playwright provides built-in support for parallel test execution, simplifying the setup process.

Inside playwright.config.js file, you can simply define the concurrency level for parallel test execution. In the example below, the configuration allows to run tests in parallel across three different browsers.

module.exports = {
  browsers: ['chromium', 'firefox', 'webkit'],
  parallel: 3,
};

The only thing left is to write your tests using Playwright’s unified API and you are ready.

Speed and Reliability

Playwright is fast due to several key factors that contribute to its performance and efficiency in browser automation and testing:

  • Lightweight Headless Browsers: Playwright leverages lightweight headless browser instances, resulting in faster startup times than traditional browsers. 
  • It utilizes a custom automation protocol that allows seamless communication between the test script and the browser. As a result, it can execute test actions quickly, minimizing latency and enhancing overall performance.
  • By using an async execution model, the Playwright allows tests to continue running while waiting for certain conditions to be met, such as performing interactions, waiting for elements, or making network requests. 

As a result, tests can proceed without unnecessary delays.

  • Network Optimization: It incorporates network optimization techniques that improve the speed of network interactions during test execution. Also, it allows interception and modification of network requests, enabling you to mock responses, modify request headers, and handle the network.  

Language Support 

Playwright supports multiple programming languages, including JavaScript, TypeScript, Python, and C#. This broad language support enables QA Engineers to choose their preferred language for writing tests. It allows teams to leverage their existing skills and expertise, promoting a smooth transition without significant disruptions or retraining efforts.

Playwright integration 

Testing frameworks

Playwright integrates well with popular testing frameworks like Jest and Mocha, allowing you to leverage your existing knowledge and infrastructure. 

For example, inside the ‘jest.config.js’ file, we simply need to add configuration to use the jest-playwright-preset package, which provides Jest-specific settings for Playwright integration. You can customize the browsers array to include the browsers you want to test against (Chromium, Firefox, WebKit).

module.exports = {
  preset: 'jest-playwright-preset',
  testEnvironmentOptions: {
    'jest-playwright': {
      browsers: ['chromium', 'firefox', 'webkit'], // Specify the browsers you want to test
    },
  },
};

AWS Integration

Playwright offers integration with various AWS (Amazon Web Services) services. 

For instance, using AWS Lambda, a serverless compute service to trigger Playwright-based tests or automation tasks within these functions, or using Step Functions to orchestrate tests or automation tasks, defining the sequence of actions and handling error scenarios. 

You can save screenshots, logs, or other test-related files into an AWS S3 bucket for further analysis or reporting. This integration enables centralized storage of test assets and facilitates collaboration among team members.

Playwright’s flexibility and extensibility allow it to seamlessly integrate with various cloud services and tools, empowering you to use AWS services to their fullest potential while ensuring reliable and scalable testing of your applications.

Conclusion 

Overall, the main benefits of using Playwright over other tools are: 

  • Comprehensive cross-browser support
  • Unified API
  • Parallel execution
  • Strong debugging capabilities
  • Seamless CI integration
  • Active community

These features make Playwright a powerful and efficient tool for cross-browser testing, ensuring your web applications deliver a consistent and high-quality experience across different browsers and platforms.


“Boost Your Testing Efficiency with Playwright” Tech Bite was brought to you by Vedad Hadžihasanović, Junior Quality Assurance Engineer at Atlantbh.

Tech Bites are tips, tricks, snippets or explanations about various programming technologies and paradigms, which can help engineers with their everyday job.

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