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This is Part 13 of the “Frontend Testing, Done Right” series. Browse the full series · Glossary Past ten E2E tests, two things start to hurt: the setup code copy-pasted into every test, and the suite slowing down as it runs in sequence. Playwright’s fixtures (a mechanism that injects repeated setup into tests) and parallel execution solve both at once — this article covers custom fixtures, auth reuse (storageState), and the safety rules for parallelism. ...

This is Part 12 of the “Frontend Testing, Done Right” series. Browse the full series · Glossary Flaky tests — the code hasn’t changed, yet some days it passes and some days it fails. It’s the first illness every team catches when adopting E2E, and left untreated it breeds a scary culture: “that one again? just rerun it.” Fortunately the cause is usually singular: finding elements too early, or the wrong way. This article pulls that root out with Playwright’s locators and auto-wait. ...

This is Part 11 of the “Frontend Testing, Done Right” series. Browse the full series · Glossary Playwright is an E2E testing tool that drives real browsers (Chromium, Firefox, WebKit) with code. E2E (End-to-End) is exactly what it says — reproducing the entire flow of a user visiting, searching, and seeing results, in an actual browser. This article goes from install to a passing first scenario in one sitting. If you’ve been following the series, this is where the stage gets bigger — we’ve been playing inside jsdom, a pretend browser; now we open a real one. New here? No problem: we start from installation, and you can put any Vite/React app of yours where the demo app sits. (Demo UI strings are Korean — 대시보드 = “Dashboard”, 검색 = “Search”.) ...

This is Part 1 of the “Frontend Testing, Done Right” series. Browse the full series · Glossary “Tests? But it already works.” We’ve all said it — or heard it. I said it for years. Look at the screen, click around, “yep, works,” done. But then the features pile up, and every time you touch the code a little voice asks, “if I change this, what breaks over there?” That creeping anxiety is exactly the moment tests become worth their price. ...