In-depth tutorials and comparisons for testing tools and frameworks — Playwright, Cypress, Selenium, Robot Framework, and more.
Test Automation
TanStack Router is a fully type-safe router for React with built-in route loaders, search parameter validation, and nested layouts. Its type-first design means bugs often show up at build time — but runtime behaviour like data loading, access guards, and navigation still needs tests. This guide covers unit
Test Automation
TanStack Query v5 handles server state — fetching, caching, synchronizing, and updating data from your API. Every meaningful UI state it manages (loading, error, success, stale, refetching) is a testing opportunity. This guide covers testing TanStack Query v5: custom query and mutation hooks, cache invalidation, optimistic updates, and offline mode behaviour.
Test Automation
Mock Service Worker (MSW) v2 intercepts HTTP requests at the network level, making it the best tool for testing TanStack Query hooks. Instead of mocking fetch directly (brittle, error-prone), MSW lets you define realistic API handlers that work across unit tests, integration tests, and the browser. This guide covers
Test Automation
TanStack Router SPAs use client-side navigation — no full page reloads, history managed by the router, search params validated by Zod. Playwright handles all of this well, but you need to account for how the SPA manages state and URL. This guide covers Playwright E2E testing for TanStack Router: client-
Test Automation
TanStack Form is a headless form library with built-in TypeScript support, field-level validation, async submission, and field arrays. Its headless design means your tests interact with real DOM elements through the form library's state — which makes Testing Library an ideal fit. This guide covers testing TanStack
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
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
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
Test Automation
RabbitMQ occupies a different niche from Kafka — it excels at task queues, request-reply patterns, and routing scenarios where Kafka would be overkill. Spring AMQP provides excellent abstractions for working with RabbitMQ, but testing those abstractions correctly requires careful setup. The wrong approach leads to tests that pass in isolation
Test Automation
Solid.js is fast by design — fine-grained reactivity, no virtual DOM, components that run once. That architecture is a strength at runtime, but it means your component tests can't rely on patterns from React or Vue. Signals update synchronously. Components don't re-render — they update