單元測試

Python testing framework for writing simple, scalable, and powerful tests

System 테스트 작성 및 실행. pytest 기반, docker-compose.acceptance.yml 필수, 4단계 순서(infra→component→integration→scenarios). 네이밍 test_{대상}_{시나리오}_{예상결과}. poetry run pytest system-tests/ 실행. Fail Fast - 모든 응답 필드/타입/에러 엄격 검증, 예상외 필드/부작용은 실패 처리.

Control Chrome browser through MCP for testing, debugging, network analysis, and performance profiling. Use when testing web apps, measuring Core Web Vitals, analyzing network requests, debugging console errors, or when the user mentions Chrome DevTools, performance traces, or browser automation.

Use when implementing features, fixing bugs, or making code changes. Ensures scope is defined before coding, then enforces RED → GREEN → REFACTOR test discipline. Triggers: 'implement', 'add', 'build', 'create', 'fix', 'change', 'feature', 'bug'.

Run automated accessibility tests on URLs or HTML content using axe-core engine to WCAG 2.2 AA standards, then format findings as standardized issue reports. Use this skill when users want to test website accessibility, find WCAG violations, audit pages for accessibility issues, check if sites are accessible, analyze HTML for accessibility problems, or create accessibility issue tickets. Triggers on requests like "test accessibility", "check for WCAG violations", "audit this URL", "is this page accessible", "find accessibility issues", or "write accessibility issues".

Diagnose and recover from unexpected test behavior during TDD

Systematic debugging workflow to reproduce, isolate, and fix hard software bugs, resolve related lint issues, and add tests and guardrails to prevent regressions. This skill should be used for complex bugs that teams struggle to fix, flaky/intermittent failures, production-only bugs, and environment-specific issues where code changes must be lint-clean.

AI-friendly architecture patterns for TypeScript projects including Domain-Driven Design, Clean Architecture, Hexagonal Architecture, and Page Object Model testing patterns

Generate high-quality synthetic datasets using statistical samplers and Claude's native LLM capabilities. Use when users ask to create synthetic data, generate datasets, create fake/mock data, generate test data, training data, or any data generation task. Supports CSV, JSON, JSONL, Parquet output. Adapted from NVIDIA NeMo DataDesigner (Apache 2.0).

Email template development with React Email and Tailwind CSS. Use when creating or modifying email templates, testing email rendering, or building email HTML from React components.

Implements features using Test-Driven Development methodology following the red-green-refactor cycle. Use when user explicitly requests TDD approach or asks to implement features test-first.

Complete guide for Chrome DevTools CLI - browser automation, debugging, performance analysis, network inspection. Use when automating Chrome, taking screenshots, analyzing performance, monitoring network/console, device emulation, or user mentions chrome-devtools, browser automation, puppeteer, debugging, performance testing, screenshot, network monitoring, console monitoring, or 크롬 개발자도구, 브라우저 자동화, 디버깅, 성능 분석.

Scaffold API mocking infrastructure using Mountebank and Testcontainers for reliable integration testing.

Create a new entity ViewModel with property ViewModels following Phoenix MVVM patterns. Use when adding new data models, creating entity wrappers, or scaffolding ViewModels for entities. Handles property VM creation, label converters, base class selection, and test generation.

Use git worktrees for parallel Claude Code workflows. Run multiple Claude instances on different features simultaneously without merge conflicts. Use for parallel development, multi-branch testing, and subagent workflows.

Evaluate and upgrade test suites with TDD/BDD rigor, coverage tracking, and reproducible evidence.

Main TDD workflow command. Finds next test in PLAN.md and executes complete TDD cycle automatically. This is the primary command for TDD development as specified in CLAUDE.md.

Expert code writer specializing in production-grade Python, FastAPI, and microservices development. Activated for writing clean, maintainable, well-tested code following best practices for the SaaS platform.

Phase 3 of OSS contribution - Design and implement the solution following project standards and best practices. Writes code following conventions, adds/updates tests, handles edge cases. Use when issue analysis is complete and ready to write code.

Build accessible user interfaces using semantic HTML, ARIA attributes, keyboard navigation, and proper color contrast. Use this skill when creating or modifying UI components, implementing forms and interactive elements, working with navigation menus, building modals and dialogs, adding images and media content, writing JSX/HTML markup, ensuring keyboard accessibility, testing with screen readers, managing focus states, implementing proper heading hierarchies, providing alternative text for images, maintaining color contrast ratios, using ARIA labels and roles, or ensuring all interactive elements are keyboard-navigable. Apply this skill when building frontend components, reviewing UI accessibility, refactoring markup for better semantics, or implementing WCAG compliance requirements.