Unit Testing

Validate test effectiveness with mutation testing using Stryker (TypeScript/JavaScript) and mutmut (Python). Find weak tests that pass despite code mutations. Use to improve test quality.

Clean codebase by eliminating waste through deletion and simplification. Use when asked to remove dead code, clean up unused imports, delete debug statements, or simplify over-engineered code. Triggers on: "use janitor mode", "clean up", "remove dead code", "delete unused", "simplify", "janitor", "eliminate waste", "reduce complexity", "remove debug code". Full access mode - modifies files and runs tests.

Comprehensive code quality verification system for running type checking, linting, and tests. Use when validating code quality, preparing commits, running CI checks locally, or when the user mentions preflight, verify, lint, typecheck, or test commands.

Pinia v3 Vue state management with defineStore, getters, actions. Use for Vue 3 stores, Nuxt SSR, Vuex migration, or encountering store composition, hydration, testing errors.

Regla 07: Pruebas. Use when writing tests, reviewing test coverage, or setting up testing.

Complete browser automation with Playwright. Auto-detects dev servers, writes clean test scripts to /tmp. Test pages, fill forms, take screenshots, check responsive design, validate UX, test login flows, check links, automate any browser task. Use when user wants to test websites, automate browser interactions, validate web functionality, or perform any browser-based testing.

Handle user questions, feature requests, and bug reports for connectrpc-axum. This skill should be used when users ask questions about the library, request new features, or report bugs. It first attempts to answer using project documentation, verifies bugs with integration tests, and submits GitHub issues when needed.

Check CI/CD status of a pull request including workflow runs and test results. Use when verifying if PR checks are passing or investigating CI failures.

Deliver production-quality Python solutions with framework-aware patterns and tests.

Test report generation with TEXT transcripts (NOT real calls). For real Twilio calls, use twilio-test-call instead.

Reviews implemented code for security, quality, performance, and test coverage using specialized review agents. Use when task file is in review/ directory and requires comprehensive code review before approval. Launches test-coverage-analyzer, error-handling-reviewer, and security-reviewer in parallel.

Laravel Dusk - Browser automation and testing API for Laravel applications. Use when writing browser tests, automating UI testing, testing JavaScript interactions, or implementing end-to-end tests in Laravel.

Scaffold new Next.js API endpoints with authentication, rate limiting, and tests. Use when creating new API routes, adding endpoints, or building API features.

Use when exploring alternative scenarios, testing assumptions through "what if" questions, understanding causal relationships, conducting pre-mortem analysis, stress testing decisions, or when user mentions counterfactuals, hypothetical scenarios, thought experiments, alternative futures, what-if analysis, or needs to challenge assumptions and explore possibilities.

Execute test suites and report results. Use when validating code functionality.

Use when testing ideas cheaply before building (pretotyping with fake doors, concierge MVPs, paper prototypes) to validate desirability/feasibility, choosing appropriate prototype fidelity (paper/clickable/coded), running experiments to test assumptions (demand, pricing, workflow), or when user mentions prototype, MVP, fake door test, concierge, Wizard of Oz, landing page test, smoke test, or asks "how can we validate this idea before building?".

Use when ML engineers need to identify symmetries in their data but don't know where to start. Invoke when user mentions data symmetry, invariance discovery, what transformations matter, or needs help recognizing patterns their model should respect. Works collaboratively through domain analysis, transformation testing, and physical constraint identification.

Use when organizing content for digital products, designing navigation systems, restructuring information hierarchies, improving findability, creating taxonomies or metadata schemas, or when users mention information architecture, IA, sitemap, navigation design, content structure, card sorting, tree testing, taxonomy, findability, or need help making information discoverable and usable.

Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.

Use when adding new test audio files for Twilio voice calls, uploading audio to S3, or updating the twilio_place_call.py script with new audio options.