playwright-core

Playwright Core Testing Opinionated, production-tested Playwright guidance — every pattern includes when (and when not ) to use it. 46 reference guides covering the full Playwright testing surface: selectors, assertions, fixtures, network mocking, auth, visual regression, accessibility, API testing, debugging, and more — with TypeScript and JavaScript examples throughout. Golden Rules getByRole() over CSS/XPath — resilient to markup changes, mirrors how users see the page Never page.waitForTimeout() — use expect(locator).toBeVisible() or page.waitForURL() Web-first assertions — expect(locator) auto-retries; expect(await locator.textContent()) does not Isolate every test — no shared state, no execution-order dependencies baseURL in config — zero hardcoded URLs in tests Retries: 2 in CI, 0 locally — surface flakiness where it matters Traces: 'on-first-retry' — rich debugging artifacts without CI slowdown Fixtures over globals — share state via test.extend() , not module-level variables One behavior per test — multiple related expect() calls are fine Mock external services only — never mock your own app; mock third-party APIs, payment gateways, email Guide Index Writing Tests What you're doing Guide Deep dive Choosing selectors locators.md locator-strategy.md Assertions & waiting assertions-and-waiting.md Organizing test suites test-organization.md test-architecture.md Playwright config configuration.md Fixtures & hooks fixtures-and-hooks.md Test data test-data-management.md Auth & login authentication.md auth-flows.md API testing (REST/GraphQL) api-testing.md Visual regression visual-regression.md Accessibility accessibility.md Mobile & responsive mobile-and-responsive.md Component testing component-testing.md Network mocking network-mocking.md when-to-mock.md Forms & validation forms-and-validation.md File uploads/downloads file-operations.md file-upload-download.md Error & edge cases error-and-edge-cases.md CRUD flows crud-testing.md Drag and drop drag-and-drop.md Search & filter UI search-and-filter.md Debugging & Fixing Problem Guide General debugging workflow debugging.md Specific error message error-index.md Flaky / intermittent tests flaky-tests.md Common beginner mistakes common-pitfalls.md Framework Recipes Framework Guide Next.js (App Router + Pages Router) nextjs.md React (CRA, Vite) react.md Vue 3 / Nuxt vue.md Angular angular.md Specialized Topics Topic Guide Multi-user & collaboration multi-user-and-collaboration.md WebSockets & real-time websockets-and-realtime.md Browser APIs (geo, clipboard, permissions) browser-apis.md iframes & Shadow DOM iframes-and-shadow-dom.md Canvas & WebGL canvas-and-webgl.md Service workers & PWA service-workers-and-pwa.md Electron apps electron-testing.md Browser extensions browser-extensions.md Security testing security-testing.md Performance & benchmarks performance-testing.md i18n & localization i18n-and-localization.md Multi-tab & popups multi-context-and-popups.md Clock & time mocking clock-and-time-mocking.md Third-party integrations third-party-integrations.md Architecture Decisions Question Guide Which locator strategy? locator-strategy.md E2E vs component vs API? test-architecture.md Mock vs real services? when-to-mock.md