Playwright Automation: Top 25 Interview Q&A Part-2
Playwright is a powerful automation tool for web applications, known for supporting multiple languages like JavaScript, TypeScript, Python, C#, and Java. It enables efficient browser automation, making it a popular choice for QA and test engineers. Below are the top 50 questions and answers that can help you prepare for Playwright Automation interviews. Playwright Automation Online Training
26. How do you emulate mobile devices in Playwright?
Answer: You can emulate mobile devices using device descriptors:
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const iPhone = playwright.devices['iPhone 12'];
const browser = await playwright.chromium.launch();
const context = await browser.newContext({ ...iPhone }); Playwright Automation Training
27. What is network interception in Playwright?
Answer: Network interception allows you to capture and modify requests and responses, useful for mocking and monitoring network calls.
28. How do you mock network responses in Playwright?
Answer: Use page.route() to intercept and mock network responses:
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await page.route('**/api/data', route => {
route.fulfill({
status: 200,
contentType: 'application/json',
body: JSON.stringify({ key: 'mocked value' })
});
});
29. What are the common debugging techniques in Playwright?
Answer: Some techniques include using the headless: false option, adding await page.pause(), using browser developer tools, and setting breakpoints.
30. How do you handle timeouts in Playwright?
Answer: Playwright has a default timeout of 30 seconds, which can be adjusted using the setDefaultTimeout method: Playwright Course Online
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page.setDefaultTimeout(60000);
31. How do you generate code in Playwright?
Answer: Playwright offers a code generator that records user actions and generates code:
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npx playwright codegen https://example.com
32. What are fixtures in Playwright Test?
Answer: Fixtures in Playwright Test provide a setup mechanism for reusable objects like pages, browsers, or contexts across tests. Playwright Online Training
33. How do you capture browser logs in Playwright?
Answer: You can capture browser logs using the page.on('console', ...) event:
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page.on('console', msg => console.log(msg.text()));
34. What is tracing in Playwright, and how do you use it?
Answer: Tracing in Playwright helps you capture screenshots, network activity, and actions to analyze test failures. You can start and stop tracing with:
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await context.tracing.start({ screenshots: true, snapshots: true });
await context.tracing.stop({ path: 'trace.zip' });
35. How do you measure performance metrics in Playwright?
Answer: You can capture performance metrics using performance.getEntries() after navigating to a page.
36. What is the role of environment variables in Playwright?
Answer: Environment variables can be used to store sensitive information like credentials and can be accessed using process.env. Playwright Training
37. How do you handle authentication pop-ups in Playwright?
Answer: You can handle basic authentication by passing credentials in the context configuration:
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const context = await browser.newContext({
httpCredentials: { username: 'user', password: 'pass' }
});
38. How do you configure Playwright to ignore HTTPS errors?
Answer: You can ignore HTTPS errors by setting the ignoreHTTPSErrors option to true:
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const context = await browser.newContext({ ignoreHTTPSErrors: true });
39. What is the role of a beforeAll and afterAll in Playwright?
Answer: These hooks allow you to set up preconditions and clean up resources before and after all tests in a file.
40. How do you handle API testing with Playwright?
Answer: Playwright supports making API requests with request.newContext(), useful for integrating API and UI testing.
41. What is the use of expect.poll() in Playwright?
Answer: expect.poll() is used to poll a function periodically until it meets the expected condition, useful for dynamic content.
42. How do you use roles in Playwright selectors?
Answer: You can use roles like button, textbox, and link in selectors to target elements with specific ARIA roles.
43. How do you run Playwright tests in Docker?
Answer: Playwright provides Docker images to run tests in containerized environments. You can use the official Playwright image from Docker Hub.
44. How do you measure the time taken for an operation in Playwright?
Answer: Use performance.now() before and after the operation to calculate the duration.
45. How do you switch between tabs in Playwright?
Answer: You can switch tabs by using context.pages() to get a list of pages and then select the desired one.
46. What is the purpose of browserContext.close()?
Answer: Closing the browser context frees up resources like memory and file handles. It’s essential to close contexts after tests to avoid memory leaks.
47. How do you handle dynamic content in Playwright?
Answer: You can handle dynamic content using methods like waitForSelector, waitForFunction, or expect.poll.
48. What is the retry feature in Playwright Test?
Answer: The retry feature allows you to automatically re-run failed tests a specified number of times to handle flaky tests.
49. How do you use the focus feature in Playwright?
Answer: You can focus on specific tests or groups of tests using .only:
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test.only('focused test', async ({ page }) => { ... });
50. What are the benefits of using Playwright for automation testing?
Answer: Playwright offers cross-browser testing, automatic waiting, powerful debugging, parallel execution, and extensive support for modern web applications, making it a robust solution for end-to-end testing.
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These questions and answers cover a broad range of Playwright topics, from basic concepts to advanced use cases, helping you prepare for interviews or enhance your automation skills. Happy learning!
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