01
How do you handle token refresh in long API test runs?
Show answer
Fetch tokens in a fixture with expiry tracking and refresh it when it is about to expire, keeping tests unaware of the details.
Tredence Playwright Testing Interview Questions & Answers
Curated interview practice questions with answers. These are practice scenarios, not a verified list of past interview questions.
About Tredence hiring for Playwright Testing roles
Tredence is a data science and analytics services company that helps retail, consumer goods, manufacturing, telecom and healthcare clients use data for decisions. It builds data engineering pipelines, machine learning models, supply chain analytics and AI solutions on modern cloud platforms. In India it hires data analysts, data engineers, data scientists and analytics consultants who work closely with global client teams.
For Playwright Testing roles, this Tredence practice set focuses most on API Testing (7), Playwright Core (5), Debugging and Trace Viewer (4), Visual & Accessibility Testing (4). It has 3 easy, 31 medium, 6 hard questions, so you can start easy and work up to the harder ones.
- Company type
- Analytics
- Headquarters
- San Jose, California, USA
- Main India offices
- Bengaluru, Chennai, Gurugram
Tredence Playwright Testing interview process
- Online assessment (aptitude + SQL + Python)
- Technical interview (SQL, statistics, ML)
- Case or managerial round
- HR round
Typical pattern based on public candidate experiences. Rounds vary by role, team and year.
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02
What are higher-order functions?
Show answer
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.
03
How do you use test.step and test annotations?
Show answer
test.step groups actions into named steps in reports; annotations such as test.skip, test.fixme and test.slow communicate intent and adjust behaviour.
04
What is a generic type parameter constraint, such as T extends object?
Show answer
A constraint limits what types a generic can accept. function pick<T extends object, K extends keyof T>(obj: T, key: K) only accepts objects and keys that exist on them, so pick(user, 'emial') fails at compile time. In test helpers this catches typos in field names and keeps return types precise without using any.
05
How many workers does Playwright use by default, and how do you change it?
Show answer
By default Playwright uses about half of the logical CPU cores on the machine. You can set workers in playwright.config as a number or a percentage string such as '50%', or override it on the command line with --workers=4. Many teams use process.env.CI ? 2 : undefined so CI runners with few cores are not overloaded while laptops use their full power.
06
Describe a time a test passed but the feature was actually broken.
Show answer
Situation: a checkout test passed, but users saw a blank order summary. Task: find why. Action: I found the test only asserted that the summary container was visible, not its contents. I added assertions on item names, totals and the order id. Result: the test caught the regression, and I reviewed other tests for similar weak assertions.
07
Write a minimal custom reporter that prints the titles of failed tests at the end.
Show answer
import type { Reporter, TestCase, TestResult } from '@playwright/test/reporter';
class FailedListReporter implements Reporter {
private failed: string[] = [];
onTestEnd(test: TestCase, result: TestResult) {
if (result.status === 'failed' || result.status === 'timedOut') {
this.failed.push(test.titlePath().join(' > '));
}
}
onEnd() {
console.log(`Failed tests (${this.failed.length}):`);
this.failed.forEach((t) => console.log(' - ' + t));
}
}
export default FailedListReporter;
08
What is APIRequestContext?
Show answer
The object behind the request fixture that holds base URL, headers and cookies, and can share cookies with a browser context.
09
An API returns 200 but the body contains an error field. How should your test catch this?
Show answer
Never trust status alone. Assert the body structure, for example that error is absent and data has the expected fields, ideally with a schema check. Report the issue, because returning 200 for errors breaks clients and monitoring. Add a helper that validates both status and body shape so every test checks it consistently.
10
How do you inspect a specific network request in the trace viewer?
Show answer
Open the Network tab in the trace viewer, which lists every request in the test. Click one to see method, URL, status, request and response headers and bodies, and timing. Selecting an action filters the list to requests around that step. This shows whether a UI failure came from a failed API, a slow response or unexpected data.
11
Visual tests pass on developers' laptops but fail in CI with tiny font differences. Why, and how do you fix it?
Show answer
Font rendering, anti-aliasing and installed fonts differ between Windows, macOS and Linux, so the same page produces slightly different pixels. The fix is to generate and compare baselines in one fixed environment, usually the official Playwright Docker image used in CI. Developers update baselines by running that container locally or through a CI job, not from their own machines. Loosening thresholds should be the last resort.
12
How do you send authentication headers?
Show answer
Set extraHTTPHeaders in the config or pass headers per request, for example Authorization: Bearer token fetched in a setup step.
13
A test fails only in WebKit. How do you investigate?
Show answer
Run it alone with --project=webkit --headed and record a trace. Compare it with the Chromium trace to see where behaviour differs, such as date input format, scrolling, font rendering or a missing browser API. Check the app's support matrix. If it is a real product bug, raise it, and skip the test for WebKit with a linked ticket until it is fixed.
14
The app logs in through a third-party OAuth pop-up. How do you automate it?
Show answer
For most tests, avoid the pop-up: get a session through a test login API or a test identity provider and save it with storageState. Keep one test for the real flow, using const popup = page.waitForEvent('popup') before clicking, then fill the provider's form inside popup. Third-party pages can change and add captchas, so limit how often you depend on them.
15
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.
16
How do you mock third-party APIs in UI tests?
Show answer
Use page.route to intercept the call and fulfil it with fixed JSON so tests do not depend on external systems.
17
Write an API test with the request fixture.
Show answer
test('get user', async ({ request }) => {
const res = await request.get('/api/users/1');
expect(res.ok()).toBeTruthy();
expect((await res.json()).id).toBe(1);
});
18
How do you send query parameters in an API request?
Show answer
// GET /api/products?category=books&page=2
const res = await request.get('/api/products', {
params: { category: 'books', page: 2 },
});
expect(res.ok()).toBeTruthy();
const body = await res.json();
expect(body.items.length).toBeGreaterThan(0);
19
What do toHaveAccessibleName and toHaveAccessibleDescription check?
Show answer
They assert the name and description that assistive technology computes for an element, using the accessibility tree rather than raw attributes. The name may come from a label, aria-label, aria-labelledby or inner text, and the description often from aria-describedby. For example an icon-only close button should have the name Close. These checks catch problems that a plain text assertion would miss.
20
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.
21
A locator matches three Delete buttons and the test fails with a strict mode violation. How do you fix it?
Show answer
First scope the locator to the item you mean, for example the row that contains the user's name: page.getByRole('row', { name: 'Ravi Kumar' }).getByRole('button', { name: 'Delete' }). Do not reach for first() or nth() as a quick fix, because the order can change and the test may delete the wrong record. Scoping by meaningful context is stable and readable.
22
How do you listen to all network requests on a page?
Show answer
Subscribe to events: page.on('request', r => ...), page.on('response', r => ...) and page.on('requestfailed', r => ...). You can log URLs, collect API calls or count failures. Unlike route, listeners only observe and cannot change traffic. They are handy for checks like 'no request returned a 5xx status during this flow'.
23
Write a custom fixture that gives a logged-in page.
Show answer
import { test as base } from '@playwright/test';
export const test = base.extend({
loggedInPage: async ({ page }, use) => {
await page.goto('/login');
await page.getByLabel('Email').fill('qa@test.in');
await page.getByLabel('Password').fill('Pass@123');
await page.getByRole('button', { name: 'Sign in' }).click();
await use(page);
},
});
24
What is codegen?
Show answer
npx playwright codegen records user actions and generates test code with suggested locators, handy for starting tests.
25
How do you debug a test in VS Code with the Playwright extension?
Show answer
Install the Playwright Test for VS Code extension. Open the Testing panel to see tests, then set a breakpoint in the test file and click Debug Test. Execution stops at the breakpoint with the browser open, so you can inspect variables. Turn on Show browser to watch runs, and use Pick locator or Record at cursor to add steps.
26
How do you test pagination or chained API calls?
Show answer
Read the next page link or IDs from earlier responses, loop until done and assert counts and uniqueness; pass IDs between calls in the same test.
27
How do you handle secrets such as passwords and tokens in CI?
Show answer
Store them in the CI system's secret store and pass them as environment variables, never in the repository or config files. Read them through process.env and fail fast if they are missing. Use dedicated test accounts with limited rights. Avoid printing them in logs, and make sure traces and screenshots do not expose them in reports.
28
How do you run a single test or file in Playwright?
Show answer
npx playwright test tests/login.spec.ts, add -g "test title" to match a name, or use test.only while debugging.
29
Images load lazily and are sometimes missing from full-page screenshots. How do you make them stable?
Show answer
Scroll the content into view or remove loading=lazy for the test, then wait until every image has loaded, for example with expect.poll checking that all img elements report complete and a natural width above zero. Serving images from mocked routes removes network timing too. Only after that call toHaveScreenshot, which then waits for two identical frames.
30
A third-party analytics script makes tests slow and flaky. What do you do?
Show answer
Block it in tests with context.route on its domain and route.abort, or fulfill it with an empty script. Analytics is not what you are testing, and blocking it removes delays and random network errors. If tracking events matter, write a few separate tests that capture the requests with waitForRequest and assert their parameters.
31
How do retries work?
Show answer
Set retries in the config or CLI and failed tests re-run in a fresh context, with trace recorded on first retry to diagnose flakiness.
32
A test uses forEach with an async callback and the checks inside never seem to run. Why?
Show answer
forEach does not wait for async callbacks, so it starts each callback and returns at once. The test may finish before the assertions run, or their errors are lost. Use for...of with await to run steps in order, or Promise.all with map when the steps can safely run in parallel. A lint rule can flag this pattern.
33
An axe scan reports 40 violations on a legacy page. How do you add accessibility checks without blocking every build?
Show answer
Record the current violations as a known baseline, for example by snapshotting violation ids and targets, and fail only on new ones. Fix the worst issues first, such as missing labels and contrast on key flows, and shrink the baseline every sprint. Make new pages and components meet zero violations from day one. Report the trend to the team so the debt is visible rather than silently ignored.
34
How do you add build details such as the commit and environment to the test report?
Show answer
Set the metadata field in playwright.config, for example metadata: { commit: process.env.GIT_SHA, env: process.env.TEST_ENV }, which reporters can read and recent HTML reports show. Inside tests use testInfo.annotations.push for per-test details like a ticket id. Custom reporters can read config.metadata in onBegin and include it in messages or uploads.
35
How do you test a dropdown component's keyboard support in a component test?
Show answer
Mount the dropdown, focus the trigger and press Enter or ArrowDown to open it. Assert the listbox is visible and the first option has aria-selected or focus. Press ArrowDown again and check the active option moves, then press Enter and assert the trigger shows the chosen value and the list is closed. Finally press Escape on an open list to confirm it closes without changing the value.
36
What are soft assertions?
Show answer
await expect.soft(locator).toHaveText('...') records the failure but lets the test continue, so you see every mismatch in one run.
37
Tell me about a time you refactored duplicated setup into fixtures.
Show answer
Situation: forty test files each repeated twenty lines of login and data setup. Task: reduce duplication and maintenance. Action: I created fixtures for the logged-in page, a test customer and page objects, migrated files in small reviewed pull requests and wrote a short guide. Result: test files became half the size and setup changes now touch one file.
38
How do you test offline behaviour?
Show answer
Call context.setOffline(true) to cut all network access for the context, then check that the app shows an offline banner or queues actions. Switch back with setOffline(false) and verify it syncs. You can also set offline: true in the context options. For a single failing endpoint, use route.abort instead of going fully offline.
39
How do you run tests on mobile viewports?
Show answer
Use device descriptors such as devices['iPhone 13'] in a project config to emulate viewport, user agent and touch.
40
What is the difference between click and dispatchEvent?
Show answer
click simulates a real user click with actionability checks; dispatchEvent fires a DOM event directly without those checks.
Tips to crack the Tredence Playwright Testing interview
- Practise SQL queries with joins, window functions and aggregations, since SQL is a core part of most Tredence analytics interviews.
- Revise statistics, hypothesis testing and common machine learning models, and be ready to explain them with business examples.
- Prepare for a business case discussion where you structure a retail or supply chain problem and suggest data-driven solutions.
- 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; Tredence interviewers usually ask follow-ups on your first answer.
Frequently asked questions
How many rounds are there in the Tredence Playwright Testing interview?
Candidates usually go through 4 stages: Online assessment (aptitude + SQL + Python); Technical interview (SQL, statistics, ML); Case or 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 Tredence Playwright Testing interview?
This practice set leans on API Testing (7), Playwright Core (5), Debugging and Trace Viewer (4), Visual & Accessibility Testing (4). Revise those first, then practise explaining one or two of your own projects end to end, because most Tredence interviewers ask you to walk through real work.
Are these the exact questions asked at Tredence?
No. These are curated practice questions that match the skills and difficulty usually tested in analytics interviews like Tredence's. They are not a leaked or verified list of past questions.
Where does Tredence hire Playwright Testing professionals in India?
Tredence has large teams in Bengaluru, Chennai, Gurugram. Openings and locations change often, so check the Tredence careers page and filter by city and experience.
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