Unit Testing

Write and run Rust tests using cargo test with unit tests, integration tests, doc tests, and property-based testing. Use when writing Rust tests or setting up test infrastructure.

Browser automation with Playwright for testing and validation. Use when user asks to test a page, verify UI, take screenshots, check responsive design, fill forms, or validate web functionality. Writes and executes custom automation scripts.

Comprehensive Ruby on Rails v8.1 development guide with detailed documentation for Active Record, controllers, views, routing, testing, jobs, mailers, and more. Use when working on Rails applications, building Rails features, debugging Rails code, writing migrations, setting up associations, configuring Rails apps, or answering questions about Rails best practices and patterns.

AI-Powered Security Testing Toolkit - Professional penetration testing tools with intelligent agent-empowering capabilities

Scan test files for anti-patterns including mesa-optimization, disabled tests, trivial assertions, and error swallowing

Write tests for backend services, APIs, and database access. Use when testing Express/Fastify handlers, services with database calls, or integration tests.

Implement minimal code to make failing tests pass (GREEN phase of TDD). Write just enough code to pass tests, no more. Use after red-phase when tests are failing.

Complex skill for testing directory support with nested dirs, binary files, and multiple file types

Integration Test E2E 테스트, TestRestTemplate 필수, Test Fixtures 재사용.MockMvc 금지, @Sql 어노테이션 테스트 데이터 설정.Gradle testFixtures 플러그인 활용, ArchUnit 의존성 검증.

Node.js development standards including jest/vitest, eslint, and prettier. Use when working with JavaScript files, package.json, or npm/pnpm.

Comprehensive frontend testing patterns including component tests (Jest/Vitest + RTL), visual regression (Playwright), accessibility (axe-core), and performance (Lighthouse) testing for React/Next.js applications. Use when building frontend tests, testing React components, implementing visual regression, running accessibility tests, performance testing, or when user mentions component testing, visual regression, a11y testing, React Testing Library, Jest, Vitest, Lighthouse, or frontend testing.

Use dev-browser for browser automation on NixOS. Invoke when user asks to test UI, automate browser interactions, take screenshots, or verify web app behavior.

Comprehensive RSpec testing for Ruby and Rails applications. Covers model specs, request specs, system specs, factories, mocks, and TDD workflow. Automatically triggers on RSpec-related keywords and testing scenarios.

Systematically verify claims in code comments, documentation, commit messages, and naming conventions. Extracts assertions, validates with evidence (code analysis, web search, documentation, execution), generates report with bibliography. Use when: reviewing code changes, auditing documentation accuracy, validating technical claims before merge, or user says "verify claims", "factcheck", "audit documentation", "validate comments", "are these claims accurate".

Test-Driven Development workflow using RED-GREEN-REFACTOR cycle - write one test, see it fail, implement minimal code, verify all tests pass, repeat

Use when testing frontend applications. AI-assisted browser testing with Playwright MCP. Fast, deterministic, no vision models needed.

Expert CRO advisor that analyzes landing pages, product funnels, UI/UX friction, and provides data-driven A/B test ideas to maximize conversions, sign-ups, trials, and retention. Use when optimizing conversion rates, analyzing funnels, designing experiments, improving CTAs, reducing drop-offs, or when user mentions conversion rate, CRO, landing page optimization, A/B testing, or funnel analysis.

Comprehensive guide for Vue 3 application development using modern best practices (2025). Covers Composition API, script setup syntax, reactivity system, composables, component patterns, TypeScript integration, performance optimization, and testing with Vitest. Use when building Vue 3 applications, creating components, writing composables, optimizing performance, or implementing Vue best practices.

Designs APIs with sandbox configuration for safe testing

Research and recommend optimal tech stacks for rapid MVP development. Analyzes requirements and recommends programming languages, frameworks, databases, AI models, APIs, services, and deployment platforms. Prioritizes developer experience, free tiers, type safety, and battle-tested solutions.