Testing
Unit testing individual pipeline components catches local bugs. But the integration between Kafka, OTel Collector, and your backends is where real failures hide. A schema mismatch between Kafka producer and OTel receiver. A Loki label cardinality issue that only surfaces under load. An OTel Collector exporter that retries forever when
Testing
Row-Level Security (RLS) is PostgreSQL's mechanism for enforcing data access policies at the database layer. For multi-tenant SaaS applications, RLS is a powerful defense-in-depth tool — even if application-layer authorization has a bug, RLS prevents cross-tenant data leakage at the database level. But RLS policies themselves can have bugs.
Testing
Role-Based Access Control (RBAC) is the authorization layer that ensures users can only access what they're permitted to. Manual testing of RBAC is insufficient — authorization bugs are subtle, easy to miss, and have severe consequences. Automated RBAC tests verify every permission boundary systematically. This guide covers implementing automated
Testing
Privilege escalation occurs when a user gains access or capabilities beyond what they were granted. Vertical escalation is gaining a higher role (user → admin); horizontal escalation is accessing another user's resources at the same privilege level. Both are critical security vulnerabilities that automated testing must catch. This guide
Testing
Module Federation was originally a Webpack 5 feature, but @originjs/vite-plugin-federation brought it to the Vite ecosystem. Testing Vite-based federated modules requires a different setup than Webpack — Vitest is the natural testing tool, and the module resolution strategy for federated imports needs specific configuration. This guide covers setting up Vitest
Testing
Micro-frontends enable independent deployment — teams can release new versions of their micro-frontend without coordinating with other teams. But this independence creates CI/CD testing challenges: how do you test a remote in isolation, how do you verify the composition still works after a remote deploys, and how do you roll
Testing
Micro-frontends communicate through defined interfaces: federated module exports, custom events, shared state, and props passed from shell to remote. When one team changes their interface without notifying consumers, the entire application breaks — and in production. Contract testing formalizes these interfaces so both sides can verify compatibility independently, without deploying the
Testing
Vector databases power the retrieval layer of AI applications — semantic search, RAG pipelines, recommendation systems, and knowledge bases. But testing them is different from testing SQL databases. You can't assert on exact row matches; you're asserting on approximate similarity, ranking order, and threshold behavior. This guide
Testing
Tauri builds desktop applications with a Rust backend and a web frontend (React, Vue, Svelte, or plain HTML/JS). Testing Tauri apps requires a split strategy: Rust unit tests for backend commands, JavaScript/TypeScript tests for the frontend, and integration tests that validate the communication between them. This guide covers
Testing
The Vue 3 Composition API changed how we write Vue components — and it changed how we test them. Composables can be tested in isolation, reactive state is explicit and predictable, and <script setup> components are simpler to reason about. But the patterns for testing them effectively aren'
Testing
Stripe webhooks are the backbone of payment processing — they notify your application when payments succeed, subscriptions change, and invoices are due. But webhook endpoints are notoriously hard to test: they need HTTPS, a signature verification step, and they handle async events that don't return values. This guide covers
Testing
Single-SPA is a framework for orchestrating multiple micro-frontend applications on a single page. Each micro-frontend registers as an application with its own lifecycle hooks — bootstrap, mount, and unmount — and Single-SPA activates them based on URL patterns. Testing Single-SPA applications requires testing at three levels: individual micro-frontend lifecycle hooks, the root-config