Testing & Debugging Skills

Build signal-based forms in Angular v21+ using the new Signal Forms API. Use for form creation with automatic two-way binding, schema-based validation, field state management, and dynamic forms. Triggers on form implementation, adding validation, creating multi-step forms, or building forms with conditional fields. Signal Forms are experimental but recommended for new Angular projects.

Implement routing in Angular v20+ applications with lazy loading, functional guards, resolvers, and route parameters. Use for navigation setup, protected routes, route-based data loading, and nested routing. Triggers on route configuration, adding authentication guards, implementing lazy loading, or reading route parameters with signals.

Write unit and integration tests for Angular v21+ applications using Vitest or Jasmine with TestBed, component harnesses, and modern testing patterns. Use for testing components with signals, OnPush change detection, services with inject(), and HTTP interactions. Triggers on test creation, testing signal-based components, mocking dependencies, or setting up test infrastructure.

Configure Vite for development and production builds. Use when setting up build pipelines, optimizing bundles, or configuring development servers.

Comprehensive Django best practices covering project structure, models (field choices, Meta options, managers, QuerySets, migrations), views (CBVs vs FBVs, generic views), Django REST Framework (serializers, ViewSets, permissions), forms, templates, security (CSRF, XSS, SQL injection), performance (N+1 queries, selectrelated, prefetchrelated, caching), testing, and common anti-patterns. Essential reference for Django code reviews and development.

Use when Django ORM patterns with models, queries, and relationships. Use when building database-driven Django applications.

Package management discipline for any JavaScript/TypeScript project: dependency declaration, semver, scripts conventions, lockfile hygiene, package-manager detection (npm/yarn/pnpm). Stack-agnostic — referenced by every JS/TS framework plugin in the marketplace.

Expert pytest framework for Python unit, integration, and functional…

Expo Router navigation patterns for React Native. Use when implementing navigation, routing, deep links, tab bars, modals, or handling navigation state in Expo apps.

Testing patterns for React Native with Jest and React Native Testing Library. Use when writing tests, mocking Expo modules, testing Zustand stores, or debugging test failures.

SQLAlchemy ORM patterns for Flask: Flask-SQLAlchemy extension setup, declarative models with db.Model, synchronous db.session queries, relationships with explicit lazy loading, Flask-Migrate integration for schema migrations. Used by flask-architect (model definitions) and flask-migrate-specialist (column finalization and migration). Activated automatically by flask-plugin/stack.md.