LinkedIn Playwright Testing Interview Questions & Answers

Functions that take other functions as arguments or return them, such as map, filter and reduce, or a helper that wraps retry logic around a test step.

Create test data through API calls, verify it in the UI and clean up via API, which makes UI tests faster and more reliable.

Fetch tokens in a fixture with expiry tracking and refresh it when it is about to expire, keeping tests unaware of the details.

Before acting, Playwright waits for the element to be attached, visible, stable, enabled and able to receive events — so manual waits are rarely needed.

npx playwright test tests/login.spec.ts, add -g "test title" to match a name, or use test.only while debugging.

POST the query and variables as JSON to the single endpoint and assert both data and errors fields in the response.

Files run in parallel by default; set workers in the config and use test.describe.configure({ mode: 'parallel' }) for tests inside a file.

Register page.on('dialog', d => d.accept()) before the action triggers the dialog.

Auto-waiting, a built-in test runner, Chromium/Firefox/WebKit with one API, network interception, the trace viewer and parallel runs out of the box — usually faster and less flaky.

Click to open the control, then use getByRole('option') or a text locator for the target item, instead of relying on fragile index-based selectors.

Run npm init playwright@latest, which sets up config, example tests and browsers; execute with npx playwright test.

setInputFiles on the input for uploads; for downloads wait on page.waitForEvent('download') and save or inspect the file.

Use device descriptors such as devices['iPhone 13'] in a project config to emulate viewport, user agent and touch.

Add retries with backoff for the API step, set a suitable timeout, and use mocks for non-critical dependencies.

The action runs without waiting, so the next step may run first — causing flaky failures or 'Target closed' errors. The @typescript-eslint/no-floating-promises rule catches it.

Playwright locators pierce open shadow roots by default, so getByRole and CSS locators work without special handling.

Integrate axe-core through @axe-core/playwright, run an analysis on the page and assert that there are no violations.

API testing checks services directly and is fast and stable; UI testing checks the full user experience in the browser and is slower.

Create a class that takes a page, defines locators as properties and exposes action methods; instantiate it in a fixture for clean tests.

Destructuring pulls values from arrays or objects into variables; spread expands an array or object into another, useful for copying and merging config.

beforeEach runs the same code before every test in scope; fixtures are lazy, composable and only set up what a test uses.

Use the official Playwright image which contains browsers and dependencies, mount the project and run npx playwright test for consistent CI environments.

undefined means a variable has not been assigned; null is an intentional empty value.

var is function-scoped and hoisted. let and const are block-scoped; const can't be reassigned (though an object it points to can change). Prefer const, then let.

A type alias describes a shape or union of values; an enum creates a named set of constants that exists at runtime.

Playwright supports multiple browsers, tabs, languages and has auto-waiting and tracing; Selenium has the widest ecosystem; Cypress runs in-browser with a great UI but has more limits across tabs.

Record timestamps around the request or use response timing, then assert the duration is under an agreed threshold.

Placeholders for types that make reusable code type-safe, for example a helper function returning the same type of item that it receives.

Named configurations that run the same tests across different browsers, devices or environments.

await expect.soft(locator).toHaveText('...') records the failure but lets the test continue, so you see every mismatch in one run.

TypeScript adds static types on top of JavaScript and compiles to it. Types catch errors early and give better autocomplete, which helps in larger test suites.

Use the request fixture: const res = await request.get('/api/users'); expect(res.ok()).toBeTruthy(); const body = await res.json();

Capture the download event, save it with download.saveAs, then read the file in Node and assert on name, size or content.

Log in once in global setup, save storageState to a JSON file and set use.storageState in the config so every test starts logged in.

map transforms each item, filter keeps items that match a condition, and reduce combines all items into a single value.

page.screenshot() for captures and config options use: { screenshot: 'only-on-failure', video: 'retain-on-failure' } for automatic evidence.

test.step groups actions into named steps in reports; annotations such as test.skip, test.fixme and test.slow communicate intent and adjust behaviour.

Use try-catch with await, or .catch() on promises, and make sure rejected promises are never left unhandled.

await expect(page).toHaveScreenshot('home.png') compares against a baseline image; tune maxDiffPixels and mask dynamic areas like dates.

Both describe the shape of data. Interfaces are extendable and suit object contracts; type aliases can also model unions and primitives.

Define projects for chromium, firefox and webkit in playwright.config.ts, set workers, then run: npx playwright test

Synchronous code runs line by line and blocks; asynchronous code starts a task and continues, handling the result later with promises or await.

page.route('**/api/items', route => route.fulfill({ json: [...] })) intercepts and replies with test data; route.abort() simulates failures.

List, dot, line, HTML, JSON and JUnit reporters, plus integrations such as Allure, configurable per environment.

Define an interface for the payload, cast or validate the parsed JSON to it (for example with zod), and use that type in assertions to catch shape changes.

Use expect(page).toHaveScreenshot() to compare with stored baselines, with thresholds and masks for dynamic regions.

Log in with request.post, call request.storageState(), and create a browser context using that state.

Tag tests (in the title or with { tag: '@smoke' }) and run: npx playwright test --grep @smoke (use --grep-invert to exclude).

Reusable setup/teardown units injected into tests (page, context, request). You can extend test with custom fixtures such as loggedInPage.

A short function syntax that does not have its own this and arguments, taking them from the surrounding scope.

JavaScript runs one call stack and uses queues for async work; the event loop pushes callbacks from the microtask (promises) and task queues when the stack is empty.

Use --debug or the Inspector, page.pause(), UI mode, the trace viewer and headed runs with slowMo.

An open-source end-to-end testing framework from Microsoft that automates Chromium, Firefox and WebKit through one API, in multiple languages.

A class receives page in its constructor, stores locators as properties and exposes actions like login(user, pass). Tests call page objects, not raw locators.

Use dotenv files per environment, read them in playwright.config and set baseURL and credentials from variables, selecting with an ENV flag.

Use page.frameLocator('#frame').getByRole(...) so actions work inside the iframe with auto-waiting.

npx playwright codegen records user actions and generates test code with suggested locators, handy for starting tests.

Use page.route to intercept the call and fulfil it with fixed JSON so tests do not depend on external systems.

Use npx playwright test --shard=1/4 in each CI job and merge reports afterwards to reduce total run time.

Assert the status with expect(res.status()).toBe(200), parse res.json() and check fields, using schema validation for the structure.