01
How do you debug a Playwright test?
Show answer
Use --debug or the Inspector, page.pause(), UI mode, the trace viewer and headed runs with slowMo.
L&T Technology Services Playwright Testing Interview Questions & Answers
Curated interview practice questions with answers. These are practice scenarios, not a verified list of past interview questions.
About L&T Technology Services hiring for Playwright Testing roles
L&T Technology Services is an engineering research and development services company and part of the Larsen & Toubro group. It works with clients in transportation, industrial products, telecom, medical devices and plant engineering on product design, embedded systems and digital engineering. In India it hires engineers for software, embedded, testing and data roles across its engineering and delivery centres.
For Playwright Testing roles, this L&T Technology Services practice set focuses most on JavaScript and TypeScript (7), Playwright Core (6), Framework Design and CI/CD (5), Component Testing (5). It has 20 easy, 20 medium questions, so you can start easy and work up to the harder ones.
- Company type
- IT services
- Headquarters
- Vadodara, India
- Main India offices
- Vadodara, Bengaluru, Chennai, Mysuru, Pune
L&T Technology Services Playwright Testing interview process
- Online assessment (aptitude + technical MCQs)
- Technical interview
- Managerial round
- HR round
Typical pattern based on public candidate experiences. Rounds vary by role, team and year.
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02
What is the blob reporter and why does it exist?
Show answer
The blob reporter writes a compact archive of everything about a run, including results, attachments and traces, into the blob-report folder. It is meant for machines rather than people. Each shard produces one blob, and npx playwright merge-reports later combines them into a single HTML, JUnit or JSON report. Without it, every shard would produce its own separate HTML report.
03
What is the difference between page.goto and page.waitForURL?
Show answer
page.goto starts a navigation to a URL and waits for the load state you choose. page.waitForURL does not navigate; it waits until the current page reaches a URL that matches a string, glob or regular expression, which is useful after a click that redirects, such as a login followed by a jump to the dashboard. Pair it with the click instead of adding fixed sleeps.
04
How do you run only smoke tests?
Show answer
Tag tests (in the title or with { tag: '@smoke' }) and run: npx playwright test --grep @smoke (use --grep-invert to exclude).
05
What is an ARIA snapshot and how does toMatchAriaSnapshot work?
Show answer
An ARIA snapshot is a YAML description of the accessibility tree for a part of the page: roles, names and states such as checked or level. toMatchAriaSnapshot compares the live tree of a locator against that template, and partial templates or regular expressions can be used for changing text. It tests structure and semantics, so it survives styling changes that would break a pixel screenshot.
06
A screenshot of a search page is flaky because a blinking text cursor appears in the input. How do you fix it?
Show answer
toHaveScreenshot hides the text caret by default with caret: 'hide', so check that nobody set it to 'initial' and that you are not using page.screenshot with toMatchSnapshot, which lacks some of these defaults. Also blur the input or click elsewhere before the capture if focus styles change. Using the dedicated assertion gives you stable captures and retries.
07
What is hoisting?
Show answer
Declarations of var and functions are moved to the top of their scope at compile time; let and const are hoisted but stay in the temporal dead zone until declared.
08
Why turn on strict mode in tsconfig for a test project?
Show answer
strict enables checks such as strictNullChecks and noImplicitAny. They catch bugs like using a value that may be undefined, missing parameters or wrong property names before tests run. In a large suite this saves debugging time and makes page objects safer to refactor. Pair it with the no-floating-promises lint rule to catch missing awaits.
09
Write an accessibility scan that checks only WCAG 2.1 A and AA rules.
Show answer
import { test, expect } from '@playwright/test';
import AxeBuilder from '@axe-core/playwright';
test('signup page has no WCAG A/AA issues', async ({ page }) => {
await page.goto('/signup');
const results = await new AxeBuilder({ page })
.withTags(['wcag2a', 'wcag2aa', 'wcag21a', 'wcag21aa'])
.analyze();
expect(results.violations).toEqual([]);
});
10
How do you organise tests with page object model in Playwright?
Show answer
Create a class that takes a page, defines locators as properties and exposes action methods; instantiate it in a fixture for clean tests.
11
What are the key options in playwright.config.ts?
Show answer
Main options are testDir for where tests live, timeout, retries, workers, fullyParallel, reporter, and the use block for shared settings like baseURL, trace, screenshot and video. projects define browsers or setups, and webServer can start the app before tests. Most values can depend on process.env.CI so local and CI runs behave differently.
12
What is a browser context and why is it cheap?
Show answer
A browser context is an isolated session inside one browser, like a fresh incognito profile with its own cookies, storage and cache. Creating one takes milliseconds, unlike launching a new browser. Playwright gives every test a new context, so tests do not leak state into each other, and you can open several contexts to simulate different users.
13
How do you set up Playwright component testing in an existing React project?
Show answer
Run npm init playwright@latest -- --ct and choose React. It installs @playwright/experimental-ct-react, creates playwright-ct.config.ts and adds a playwright folder containing index.html and index.tsx. index.html hosts the mounted component and index.tsx is where global styles, themes and providers go. Tests then live in files such as Button.spec.tsx and run with npx playwright test -c playwright-ct.config.ts.
14
What is the difference between page.route and context.route?
Show answer
page.route applies only to requests from that page. context.route applies to every page in the browser context, including pop-ups and new tabs opened later. Use context.route when a flow opens new windows, such as a payment pop-up, or when you set up mocks in a fixture before the page exists. Page routes take priority over context routes.
15
How do you test a file download?
Show answer
const [download] = await Promise.all([
page.waitForEvent('download'),
page.getByText('Export').click(),
]);
await download.saveAs('reports/file.csv');
16
What is the difference between page, context and browser?
Show answer
A browser is the engine instance; a context is an isolated session (cookies, storage); a page is a tab inside a context.
17
What are arrow functions?
Show answer
A short function syntax that does not have its own this and arguments, taking them from the surrounding scope.
18
How do you change the default assertion timeout?
Show answer
Web-first assertions wait 5 seconds by default. Change it globally in playwright.config with expect: { timeout: 10000 }, or for one assertion with await expect(locator).toBeVisible({ timeout: 15000 }). Raise it only for genuinely slow steps like report generation. Raising it everywhere hides performance problems and makes failing tests slower to report.
19
What does the JSON reporter output and how would you use it?
Show answer
The JSON reporter writes the full suite tree with every test, its status, retries, duration, errors and attachment paths into one file. Teams parse it in scripts to post a summary to chat, to collect flaky tests that passed on retry, or to push results to a database for trends. Set outputFile so the JSON does not mix with console output.
20
What is the use block in playwright.config?
Show answer
The use block sets default options for every test, such as baseURL, headless, viewport, locale, trace, screenshot and video. Each project can override them in its own use block, and a file can override again with test.use. This layered setup keeps shared settings in one place while still allowing browser- or file-specific changes.
21
What is auto-waiting in Playwright?
Show answer
Before acting, Playwright waits for the element to be attached, visible, stable, enabled and able to receive events — so manual waits are rarely needed.
22
How do you change a mounted component's props during a test?
Show answer
Call component.update with new JSX, for example await component.update(<Badge count={5} />). Playwright re-renders the same instance with the new props, so internal state is kept, just like a parent re-rendering it in the app. This lets you test effects that react to prop changes. To test fresh mounting behaviour instead, unmount and mount again.
23
What is ctViteConfig and when do you need it?
Show answer
ctViteConfig is an option in the use block of playwright-ct.config.ts that passes extra Vite settings to the component bundle. You need it when the app relies on path aliases, plugins, environment defines or special asset handling that Playwright's default Vite setup does not know about. A typical case is adding resolve.alias so imports like @/components work in tests.
24
In what order do hooks and fixtures run?
Show answer
Worker fixtures and beforeAll run first for the worker. For each test, the test fixtures it needs are set up, then beforeEach hooks run, then the test body. Afterwards afterEach hooks run, then test fixtures are torn down in reverse order. afterAll and worker fixture teardown run when the worker finishes. Fixtures are lazy, so unused ones never run.
25
interface vs type in TypeScript?
Show answer
Both describe object shapes. Interfaces can be extended and merged; type aliases can also describe unions and primitives. Use interfaces for page or test-data shapes, types for unions.
26
How do you handle rate limits or slow APIs in tests?
Show answer
Add retries with backoff for the API step, set a suitable timeout, and use mocks for non-critical dependencies.
27
Why is sharing state between tests through module-level variables a bad idea?
Show answer
Each worker has its own copy of module variables, so values set in one worker are invisible to others, and order changes between runs. Tests that pass alone fail in parallel or after a retry. Pass data through fixtures, or store it in an external source like the API. Each test should be able to run alone, in any order.
28
When should you choose a component test over an end-to-end test?
Show answer
Choose a component test when the behaviour lives inside one component: validation messages, disabled states, sorting in a table, keyboard handling in a dropdown or rendering of edge-case data. These are slow and awkward to reach through full flows. Choose end-to-end when the risk is in integration, such as routing, authentication or data saved on the server.
29
What is npm and package.json?
Show answer
npm is the Node package manager. package.json lists the project's dependencies and scripts, such as the command that runs the tests.
30
What is the difference between map, filter and reduce?
Show answer
map transforms each item, filter keeps items that match a condition, and reduce combines all items into a single value.
31
Tell me about a time an accessibility check caught a real issue before release.
Show answer
Situation: a new checkout redesign was ready for release. Task: I had just added an axe scan to our Playwright smoke tests. Action: the scan flagged that the payment form inputs had placeholder text but no labels, and a keyboard test showed the pay button was unreachable with Tab. I raised it with screenshots and the rule links. Result: the developer fixed both in a day and the release went out on time.
32
What is the difference between == and === in JavaScript?
Show answer
=== compares value and type without conversion, so '5' === 5 is false. == converts types first, so '5' == 5 is true and null == undefined is true. Implicit conversion causes surprising bugs, so test code should always use === and !==. TypeScript and lint rules such as eqeqeq help enforce this.
33
What does the webServer option do?
Show answer
webServer tells Playwright to start your app with a command, such as npm run start, and wait until a URL or port responds before running tests. reuseExistingServer: !process.env.CI lets you use an already running dev server locally. You can define several servers, for example frontend and a mock API. It shuts them down after the run.
34
What is the difference between API testing and UI testing?
Show answer
API testing checks services directly and is fast and stable; UI testing checks the full user experience in the browser and is slower.
35
What are the built-in fixtures page, context, browser and request?
Show answer
page is a fresh tab for each test. context is the isolated browser context that owns the page, with its own cookies and storage. browser is the shared browser instance for the worker. request is an APIRequestContext for HTTP calls. You ask for them by name in the test function, and Playwright creates and cleans them up automatically.
36
What is Playwright component testing?
Show answer
Component testing mounts a single UI component, such as a React or Vue button or form, in a real browser page and tests it with the normal Playwright API. Playwright bundles the component with Vite, serves it on a small page and gives you a mount fixture. You get real browser rendering and events, which unit tests in jsdom cannot give, while staying much faster than full end-to-end flows. The feature is still marked experimental.
37
What does --repeat-each do?
Show answer
--repeat-each=N runs every selected test N times in the same run, spread across workers. It is useful for checking a new or fixed test for flakiness before merging, for example npx playwright test checkout.spec.ts --repeat-each=20. Combined with several workers it also surfaces tests that collide with each other over shared data.
38
What is UI mode and how is it different from --debug?
Show answer
UI mode, opened with npx playwright test --ui, is a dashboard to run, filter and watch tests, with a trace-like timeline for each one and a watch mode that reruns on file changes. --debug opens the Inspector to step through a single run live. Use UI mode for daily development and --debug for stepping through a specific action.
39
What does npx playwright test --last-failed do?
Show answer
It reruns only the tests that failed in the previous run, using the results stored in the test-results folder. It saves time while you fix failures locally because you do not rerun the whole suite. Combine it with --headed or --debug to investigate. Run the full suite again before pushing to confirm nothing else broke.
40
How do you check a checkbox and verify it is checked?
Show answer
const terms = page.getByRole('checkbox', { name: 'I agree to the terms' });
await terms.check();
await expect(terms).toBeChecked();
await terms.uncheck();
await expect(terms).not.toBeChecked();
// setChecked(true) works for both cases
Tips to crack the L&T Technology Services Playwright Testing interview
- Revise core engineering subjects from your branch along with C, basic data structures and one scripting language before the technical round.
- Be ready to explain an academic or internship project end to end, including design choices, tools used and testing approach.
- Read about LTTS segments like mobility, medical devices and plant engineering so you can connect your skills to a domain.
- Keep a one-minute story ready for every project on your CV: problem, your part, tools, result.
- Practise the hard questions on this page aloud; L&T Technology Services interviewers usually ask follow-ups on your first answer.
Frequently asked questions
How many rounds are there in the L&T Technology Services Playwright Testing interview?
Candidates usually go through 4 stages: Online assessment (aptitude + technical MCQs); Technical interview; Managerial round; HR round. The exact rounds change with the role, team, location and your experience, so confirm the process with the recruiter.
Which topics should I prepare for the L&T Technology Services Playwright Testing interview?
This practice set leans on JavaScript and TypeScript (7), Playwright Core (6), Framework Design and CI/CD (5), Component Testing (5). Revise those first, then practise explaining one or two of your own projects end to end, because most L&T Technology Services interviewers ask you to walk through real work.
Are these the exact questions asked at L&T Technology Services?
No. These are curated practice questions that match the skills and difficulty usually tested in it services interviews like L&T Technology Services's. They are not a leaked or verified list of past questions.
Where does L&T Technology Services hire Playwright Testing professionals in India?
L&T Technology Services has large teams in Vadodara, Bengaluru, Chennai, Mysuru, Pune. Openings and locations change often, so check the L&T Technology Services careers page and filter by city and experience.
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