Test Automation
React Server Components (RSC) run exclusively on the server. They can read from databases, call internal APIs, and access the filesystem — none of which is available in a jsdom environment. This creates a fundamental mismatch: your existing client-side testing tools won't work out of the box. This guide
Test Automation
React Compiler — previously called React Forget — automatically memoizes your components and hooks. It eliminates the need for manual React.memo(), useCallback, and useMemo in most cases. This is a significant shift: tests that were written to verify memoization behaviour may now be testing something the compiler handles, or testing assumptions
Test Automation
React 19 shipped a handful of hooks that change how you think about async state, form handling, and data loading. Most of your existing tests still work — but the new hooks introduce async patterns that need deliberate test strategies. This guide covers testing useOptimistic, useFormStatus, and the new use() hook
Test Automation
Partial Prerendering (PPR) is Next.js 15's hybrid rendering strategy: the static shell of a page is served instantly from the CDN edge, while dynamic content streams in behind Suspense boundaries. A single page can have both a prerendered header and a live-fetched product listing — without a full
Test Automation
Next.js 15 App Router introduced a file-based convention that determines how your application behaves in loading, error, and layout states. Each file — layout.tsx, loading.tsx, error.tsx, not-found.tsx — plays a distinct role, and each one needs tests that match its purpose. This guide covers how to test
Testing
Maestro takes a different approach to mobile UI testing than most frameworks. Instead of writing JavaScript or Python test code, you define flows in YAML. Instead of requiring build-time instrumentation, it works with any app — debug builds, release builds, or even apps you don't have the source for.
Testing
Running mobile E2E tests locally is one thing. Getting them to run reliably in CI is another problem entirely. You're dealing with emulators that need time to boot, builds that need to be cached, iOS simulators that require macOS runners, and Android emulators that need KVM acceleration or
Testing
End-to-end testing React Native apps is hard. You have two platforms, hardware variance, async bridge operations, and a runtime that doesn't behave like a browser. Detox was built specifically to solve this — it's a gray-box E2E framework that talks directly to your app's native
Testing
If you're building a React Native app and need E2E tests, you'll eventually choose between Detox and Maestro. They're the two most widely used options, they take fundamentally different architectural approaches, and the right choice depends heavily on your team's structure and
Testing
Django ships with a solid testing infrastructure built on top of Python's unittest. Most Django developers use 10% of what's available to them. This guide covers the full picture: TestCase, the test Client, fixtures, factories, and how Django manages test databases. Every section includes working code
Testing
pytest-django replaces Django's built-in test runner with pytest, giving you parametrize, fixtures with dependency injection, better output, and a plugin ecosystem that Django's unittest-based runner simply can't match. This tutorial covers the complete setup and the features that matter most in practice. Installation and
Testing
FastAPI is async-native. Endpoint functions declared with async def run in an async context, and testing them requires an async test client and an async test runner. pytest-asyncio combined with httpx.AsyncClient gives you everything you need. This guide covers async endpoint testing, database integration, WebSocket testing, and background task