Testing
Remix's file-based routing, nested routes, and server-side rendering require E2E tests that exercise the full stack. Playwright is the right tool: it runs tests in real browsers, handles JavaScript-rendered content, and integrates cleanly with Remix's dev server. This guide covers Playwright setup for
Testing
SvelteKit ships without a testing setup. You create a project with npm create svelte@latest, pick a template, and get a working app — but zero tests. This guide covers everything you need: unit tests for utilities, component tests for Svelte components, integration tests for load functions and API routes, and
Testing
Playwright is the E2E test runner of choice for SvelteKit. It drives a real browser — Chromium, Firefox, or WebKit — against your running app. Unlike Vitest component tests that run in jsdom, Playwright tests exercise real browser behavior: navigation, cookies, local storage, JavaScript rendering, and network requests. This guide covers Playwright
Testing
SvelteKit API routes (+server.ts) and server load functions (+page.server.ts) contain your application's backend logic. They handle request validation, database queries, authentication checks, and error responses. Testing them directly — without starting a server — is fast, reliable, and catches the class of bugs that frontend tests completely
Testing
SvelteKit form actions handle POST requests from <form> elements on the server. They validate input, interact with databases, send emails, and return structured responses. Testing them directly — without a running server — catches validation bugs, missing error handling, and incorrect redirects before they reach users. How Form Actions Work
Testing
Svelte stores hold application state. When store logic is wrong — a derived value computes incorrectly, a custom store doesn't clean up subscriptions, an async store gets stuck in a loading state — components using that store will fail in ways that are hard to trace. Testing stores in isolation
Testing
Svelte components have logic in them. Props control rendering, user interactions trigger state changes, events propagate to parent components. Testing that logic prevents regressions and documents expected behavior. This guide covers Svelte component testing with Vitest and @testing-library/svelte — the combination used by most production SvelteKit projects in 2026.
Deployment
Progressive delivery automatically routes a small percentage of traffic to a new version, analyzes metrics, and either advances the rollout or triggers an automatic rollback. The system replaces human judgment in the deployment pipeline — which means the testing focus shifts to validating that the automation itself is correctly configured. Progressive
Deployment
Blue-green deployment reduces downtime risk by running two identical production environments — blue (live) and green (new). The switch happens at the router level, and rollback is instant: flip traffic back to blue. The testing challenge is making the cutover decision confidently: is green actually ready? The Blue-Green Testing
API Testing
Kong API Gateway sits between your clients and your services. It handles authentication, rate limiting, routing, transformations, and more — all through plugins. Testing Kong configurations catches issues before they reach production: misconfigured rate limits, broken auth chains, routing errors, and plugin interactions that work in isolation but conflict when combined.
Testing
Chaos Mesh is a Kubernetes-native chaos engineering platform. It injects failures — pod crashes, network delays, CPU stress, disk failures — directly into your cluster via Kubernetes CRDs, without modifying application code. The goal is to discover resilience failures before they happen in production. Why Chaos Engineering Your monitoring, alerting, and
API Testing
AWS API Gateway is notoriously difficult to test. Its configuration is spread across stages, integrations, authorizers, and models — none of which is easily testable in isolation. This guide covers pragmatic strategies: unit-testing Lambda authorizers, using mock integrations for downstream isolation, testing with CDK constructs, and integration testing against real