If you expect multiple popups in a single test, call waitForEvent(‘page’) again or switch to context.on(‘page’, handler) for a persistent listener. Projects is what enables cross-browser runs, use defines defaults that apply to every test, and reporter controls what kind of output you get. Playwright.config.ts is the single source of truth for how your suite runs. Most are quick, single-fact questions, but they catch out candidates who only watched tutorials. Microsoft maintains it https://uvik.io/ as open source; it runs the same tests on Chromium, Firefox, and WebKit through a single API, and the bundled test runner removes the third-party glue (Mocha, Jest, allure-reporter) that older Selenium projects used to need.
End-to-end UI testing is the primary use case, but Playwright also covers API testing through APIRequestContext, component testing for React, Vue, and Svelte, visual regression with toHaveScreenshot, and behaviour-driven testing through the playwright-bdd package when you need Gherkin scenarios. By default, Playwright downloads its own pinned builds of each engine. Unless your team has a strong Java or Python preference, TypeScript is the safe default. In the 2026 job market, the JavaScript and TypeScript binding is by far the most adopted.
- Each browser instance runs in its own isolated environment, enabling parallel execution of tests and reducing the risk of interference between them.
- A global variable is the one declared outside of a function, in a so-called global space.
- Our expert-vetted question bank helps you assess deep Python knowledge beyond syntax.
- Showing that you know the quick approach and when to reach for something more customizable tells the interviewer you can adapt to different situations.
Exception handling is essential for gracefully handling errors and exceptions that may occur during program execution. These structures are essential for writing logic and controlling program flow. Understanding and using these data types effectively is crucial for any Python programming task. Understanding data types is crucial for effective data manipulation and type handling.
This makes it suitable for cross-browser testing, ensuring web applications function correctly across different platforms. It is primarily focused on web scraping and web testing but is limited to only Chrome and Chromium, although there are workarounds to use Firefox. To generate HTML reports in Playwright, you can use the built-in HTML reporter or integrate popular reporting libraries. This method provides a powerful way to interact with complex DOM structures where traditional selectors might fall short. Understanding the difference between hard assertions and soft assertions can significantly affect test execution and debugging processes.
We’ve observed that developers accustomed to the rich debugging capabilities of IDEs can sometimes encounter challenges when transitioning to these constrained coding environments. Once you set your goals, you can create a focused and tailored practice plan that includes regular coding exercises and mock interview scenarios. Recognizing your proficiency level helps you focus your preparation on areas that require the most attention. Beginners can gauge their understanding of basics, while advanced programmers can test their knowledge of more complex use cases. This guide helps in this assessment by categorizing questions by difficulty.
Playwright handles native dialogs through an event listener pattern. The other two exist for specific cases where you already have a reference to the frame element or its name. It returns a locator-style API, supports auto-wait, and handles late-loading frames cleanly. Playwright gives you 3 approaches, each suited to a different scenario. Worker scope is how you avoid expensive setup running hundreds of times.
Apply Now Break into product-based companies and land your dream high-paying SDE job in just 9 months. Generally, the last element added to the stack is the first to be removed owing to its first-in, first-out structure. The last operation, peek, allows the viewing of an element in a stack without performing any necessary modification. Afterward, I conduct a series of functionality tests and record all defects, prioritizing their fixing based on severity and impact. Lastly, fixed website design uses fixed pixel widths, thus producing websites with less user-friendliness among different devices.
It may combine a small data problem, a test-automation task, a bug review, and follow-up design questions. Test it, explain complexity, then improve it only if the constraints require improvement. A strong answer is correct, readable, covered by edge cases, and honest about complexity and assumptions.
Additionally, Playwright has built-in handling for scenarios like intercepting network requests and capturing screenshots, which makes it ideal for testing complex web apps. NumPy automatically expands smaller arrays to match a larger array’s shape during arithmetic, avoiding explicit loops NumPy arrays are faster and support vectorized math; lists don’t. It’s the constructor — runs automatically when an object is created.
The consequence, if confirmed, is handled quietly on the employer side, which is why staying clean on the shared screen is the only safe play. When the next-round invite or rejection arrives, it is based on that summary, not on a raw number. There is no auto-published score you can check the same day. A single timed run exposes more pacing gaps than a week of untimed practice. I drilled equals and hashCode contracts, string and array counting, and a couple of small OOP exercises. I also skipped system-design prep, because the SWE screen is bug-fix plus DSA, not design.