Testing
Subscription billing is complex. A user upgrades mid-cycle, downgrades at renewal, reactivates after cancellation, or disputes a charge — each scenario has specific proration rules, invoice behaviors, and state transitions. Without systematic testing, billing bugs are guaranteed. This guide covers testing subscription lifecycle scenarios: plan changes, proration, trial periods, invoice generation,
Testing
@testing-library/vue applies Testing Library's core philosophy to Vue 3 component tests: query elements the way users find them, interact with the interface like a user would, and assert on visible outcomes rather than implementation details. This guide shows how to write Vue 3 component tests with Testing
Testing
RAG (Retrieval-Augmented Generation) pipelines combine a retrieval system with an LLM to answer questions using your own data. Testing RAG pipelines is challenging because both the retrieval component and the generation component can fail independently — or fail together in ways that aren't obvious. This guide covers testing RAG
Testing
Nuxt 3's auto-imports, composables, and server routes require a different testing approach than standard Vue 3. Vitest combined with @nuxt/test-utils provides first-class support for testing in the Nuxt runtime environment — giving you access to auto-imported functions, useNuxtApp(), and SSR utilities without elaborate mocking. This guide covers unit
Testing
Nuxt 3's server directory provides a full Node.js server powered by H3, Nitro, and unjs utilities. Server routes in /server/api/, middleware in /server/middleware/, and utilities in /server/utils/ are testable as regular HTTP handlers — you don't need to spin up a browser to
Testing
Nuxt 3's server-side rendering, file-based routing, and auto-imports make it a powerful framework — and each of those features introduces testing considerations that plain Vue apps don't have. Playwright is the right tool for Nuxt 3 end-to-end testing: it handles SSR-rendered HTML, navigates routes, intercepts network requests,
Testing
ChromaDB is one of the most popular open-source vector databases for AI applications — lightweight, easy to embed in Python applications, and well-suited for testing because it runs fully in-memory without external dependencies. This guide covers testing ChromaDB integrations: collection management, embedding functions, metadata filtering, and persistence. Why ChromaDB Is Testing-Friendly
AI Agents
LangGraph compiles agent behavior into a directed graph. Nodes are functions. Edges are transitions. State flows through the graph, getting modified at each node. It's a clean mental model — and it creates a natural seam for testing. The problem is that most LangGraph developers test the graph as
AI Agents
CrewAI orchestrates multiple agents working together toward a shared goal. A researcher agent gathers information. A writer agent drafts content. An editor agent refines it. Each has a role, a set of tools, and a defined responsibility. The complexity that makes CrewAI powerful — multi-agent coordination, role-based delegation, sequential task chains
AI Agents
AI guardrails are the safety layer between user input and your language model. They block prompt injections, filter inappropriate content, redact PII from outputs, and resist jailbreak attempts. They're also the part of your AI system that's most likely to be skipped in testing. The reasoning
AI Agents
Observability for AI agents is different from observability for traditional software. A web server trace shows function calls and database queries. An AI agent trace shows LLM calls, tool invocations, token counts, and reasoning chains. The failure modes are different too: not just errors and timeouts, but hallucinations, reasoning loops,
AI Agents
A multi-agent pipeline is a chain of AI agents where each agent's output becomes the next agent's input. Agent A researches. Agent B synthesizes. Agent C writes. Agent D edits. When the final output is wrong, you have a debugging problem: which agent introduced the failure?