Unit Testing

Implement mobile-first responsive designs with fluid layouts, breakpoints, relative units, and touch-friendly interfaces that work across all device sizes. Use this skill when writing or modifying React components (.tsx, .jsx files), when implementing CSS or Tailwind responsive utilities (sm:, md:, lg:, xl: breakpoints), when working on layout components, navigation menus, grid systems, when optimizing for mobile devices, tablets, or desktop screens, when implementing media queries, when ensuring touch-friendly UI elements, or when testing cross-device compatibility.

Use when creating new skills, editing existing skills, or verifying skills work before deployment - applies TDD to process documentation by testing with subagents before writing, iterating until bulletproof against rationalization

Testing patterns for Vercel AI SDK including mock providers, streaming tests, tool calling tests, snapshot testing, and test coverage strategies. Use when implementing tests, creating test suites, mocking AI providers, or when user mentions testing, mocks, test coverage, AI testing, streaming tests, or tool testing.

Systematic UI testing using Playwright for GAO-Dev web interface. Provides patterns for testing layouts, interactions, and visual regressions. Use when testing web interface changes or verifying UI bug fixes.

Tests JavaScript and TypeScript applications with Jest test runner including mocking, snapshot testing, and code coverage. Use when setting up testing, writing unit tests, or when user mentions Jest, test runner, or JavaScript testing.

Repository discovery and development commands for Soracom repos. Use when cloning repos, running builds/tests, or identifying which repos a feature affects.

Find and attach the newest screenshot PNG in ~/temp/screenshots. Use when a user asks to locate, show, or attach the latest screenshot or wants the newest PNG from the screenshots folder.

Use when creating new skills, editing existing skills, or verifying skills work before deployment - applies TDD to process documentation by testing with subagents before writing, iterating until bulletproof against rationalization

Writing Probitas scenarios. MUST BE USED when writing/editing E2E tests, creating scenarios, or working with *.probitas.ts files.

Building and deploying Expo React Native apps to iOS. Use when configuring EAS Build, submitting to TestFlight, App Store deployment, managing certificates, or troubleshooting build issues.

This skill should be used when the user asks to "write specs", "create spec", "add RSpec tests", "fix failing spec", or mentions RSpec, describe blocks, it blocks, expect syntax, test doubles, or matchers. Should also be used when editing *_spec.rb files, working in spec/ directory, planning implementation phases that include tests (TDD/RGRC workflow), writing Testing Strategy or Success Criteria sections, discussing unit or integration tests, or reviewing spec output and test failures. Comprehensive RSpec and FactoryBot reference with best practices, ready-to-use patterns, and examples.

Comprehensive Spring Boot 3.x best practices for building scalable, maintainable enterprise applications with Jakarta EE. Use this skill when creating Spring Boot applications, designing REST APIs, implementing security, writing tests, or architecting Spring Boot projects. Covers Controller-Service-Repository patterns, validation, error handling, testing strategies, performance optimization, and production-ready configurations.

Use when writing narrative memos, 6-pagers, 1-pagers, press releases, or PRFAQs in Amazon style. Applies Amazon's no-PowerPoint writing standards with data over adjectives, active voice, and the "so what" test.

CI/CD pipelines as merge gates. Tests, security scans, and linting must pass before code reaches production. Automated validation that satisfies auditors.

Create comprehensive Selenium test scripts using the 3-agent workflow (planner → architect → scripter). Use this when the user asks to create selenium tests, write test scripts, test a page with selenium, automate testing workflows, or needs selenium page objects.

Validate test suite quality using mutation testing with mutmut or cosmic-ray to detect weak tests, calculate mutation scores, and improve test coverage. Use when validating test effectiveness, achieving high test quality, or detecting tests that pass but don't validate behavior.

Expert on Aptos blockchain, Move language, smart contracts, NFTs, DeFi, and Aptos development. Triggers on keywords aptos, move, blockchain, smart contract, nft, defi, web3, mainnet, testnet, devnet

API authentication patterns, SDK installation scripts, environment variable management, and connection testing for ElevenLabs. Use when setting up ElevenLabs authentication, installing ElevenLabs SDK, configuring API keys, testing ElevenLabs connection, or when user mentions ElevenLabs authentication, xi-api-key, ELEVENLABS_API_KEY, or ElevenLabs setup.

Manage major dependency version upgrades with compatibility analysis, staged rollout, and comprehensive testing. Use when upgrading framework versions, updating major dependencies, or managing breaking changes in libraries.

Write BDD scenarios in Gherkin format (Given/When/Then) in pure business language. Use when creating acceptance tests, user story scenarios, or stakeholder-readable specifications.