Testing / Playwright Interview questions

How do you handle authentication state across tests in Playwright?

Rather than logging in through the UI at the start of every test - which is slow and repeated hundreds of times - Playwright supports saving authenticated browser state once and reusing it.

// auth.setup.ts - runs once
await page.goto('/login');
await page.getByLabel('Email').fill('user@example.com');
await page.getByRole('button', { name: 'Log in' }).click();
await page.context().storageState({ path: 'state.json' });

// playwright.config.ts
use: { storageState: 'state.json' }

storageState() captures cookies and local storage into a JSON file; pointing the config's use.storageState at that file makes every subsequent test start already logged in. Playwright's project dependencies feature is typically used to run this setup project once before the tests that depend on it.

Take quiz

storageState() saves which data for reuse? Only screenshots

✗ Try again if not.

Cookies and local storage

✓ Correct! Well done.

The full browser binary

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The main benefit of reusing saved auth state is: Avoiding repeated UI logins in every single test

✓ Correct! Well done.

Making tests run only in headed mode

✗ Try again if not.

Removing the need for a test runner

✗ Try again if not.

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How do you take a screenshot in Playwright? How do you handle iframes in Playwright? How do you use the page.goto() method? What is a fixture in Playwright? What are assertions in Playwright? What is the difference between page.click() and locator().click()? What are the supported programming languages in Playwright? What are locators in Playwright? Describe the Playwright Inspector? List the different types of locators in Playwright? What is the Trace Viewer in Playwright? How do you use codegen in Playwright? What is the difference between Playwright and Selenium? How does Playwright handle multiple tabs and windows? What is Playwright? What are the supported browsers in Playwright? How do you install Playwright? What is the purpose of the Playwright Test Runner? Define auto-waiting in Playwright? What is the difference between expect().toBeVisible() and isVisible()?

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