Playwright Automation: Top 25 Interview Q&A Part-2
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
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26. How do you emulate mobile
devices in Playwright?
Answer: You can emulate mobile devices using device
descriptors:
javascript
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const iPhone = playwright.devices['iPhone 12'];
const browser = await playwright.chromium.launch();
const context = await
browser.newContext({ ...iPhone }); Playwright
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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:
javascript
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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
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javascript
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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:
bash
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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
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33. How do you capture browser
logs in Playwright?
Answer: You can capture browser logs using the page.on('console', ...) event:
javascript
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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:
javascript
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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
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37. How do you handle
authentication pop-ups in Playwright?
Answer: You can handle basic authentication by passing
credentials in the context configuration:
javascript
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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:
javascript
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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:
javascript
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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.
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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