DevOps
Terraform modules can look correct but deploy broken or insecure infrastructure. Checkov catches security misconfigurations statically before a plan runs. Terratest deploys real infrastructure to validate it works end-to-end. Together, they give you a complete testing pyramid for Terraform: fast static checks in every PR, and real infrastructure validation in
Testing
Broken analytics tracking is one of the hardest bugs to detect — the app works fine, but your data pipeline silently receives malformed events or nothing at all. This guide covers testing Segment analytics.js event tracking: mocking the Segment library, validating event schemas in unit tests, verifying event delivery in
AI Testing
Testing LLM applications is hard because the outputs are open-ended text — there's no single correct answer. LLM-as-judge sidesteps this by using a capable model to score another model's outputs according to defined rubrics. This guide covers the key evaluation patterns: G-Eval for rubric-based scoring, pairwise comparison
Testing
Modern background job systems differ fundamentally in their execution model, and those differences shape how you test them. Inngest replays your entire function body on each step. Trigger.dev executes tasks as isolated units. BullMQ processes jobs as single-invocation functions with Redis-backed state. Getting your testing strategy wrong for each
Testing
shadcn/ui is not a component library you install — it's a collection of components you copy into your codebase, built on Radix UI primitives and styled with Tailwind CSS. Because you own the source code, testing shadcn/ui components means testing your actual components, not a third-party package.
Testing
Headless UI, maintained by the Tailwind Labs team, provides fully accessible unstyled components for React and Vue. Unlike Radix UI, Headless UI has a smaller surface area — focused on the most common interactive patterns. Testing it requires understanding its approach to state management and how it exposes that state for
Testing
Radix UI provides unstyled, accessible React primitives that handle complex interaction patterns — keyboard navigation, focus management, ARIA attributes — so you don't have to. Testing Radix UI components effectively means verifying these accessibility behaviors work in your application context, while also validating your custom logic and styling don'
Testing
Ark UI (the headless component layer behind Chakra UI v3) is built on Zag.js — a finite state machine framework. Unlike Radix or Headless UI, Ark UI components have explicit state machines that drive behavior. This architecture makes them highly predictable, but testing requires understanding how state transitions manifest in
Testing
Headless component libraries — shadcn/ui, Radix UI, Headless UI, Ark UI — are built with accessibility as a core feature. But "accessible by design" doesn't mean "accessible by default in your application." Your composition, custom styles, and application logic can break the accessibility guarantees these
Testing
Trigger.dev v3 brings a task-centric model for background jobs: each task is a durable, retriable unit that can spawn subtasks, wait on external events, and execute long-running logic without timeouts. Testing these tasks requires understanding their lifecycle and the tools Trigger.dev provides for isolation. Trigger.dev v3 Architecture
Testing
QStash and Upstash Queue are serverless message queue services built on Redis. QStash delivers HTTP callbacks with at-least-once semantics, deduplication, scheduling, and retry logic. Upstash Queue provides FIFO queues with consumer groups. Testing these systems requires understanding their delivery guarantees and designing tests that verify your message handlers behave correctly
Testing
Inngest is a serverless background job platform that runs durable functions via event triggers. Unlike traditional job queues, Inngest functions are composable: each step.run is a discrete, retriable unit. Testing this architecture requires understanding how Inngest executes functions and where your logic actually lives. How Inngest Executes Functions Inngest