Unit Testing

Guide for designing Instance resources in OptAIC. Use when creating DatasetInstance, SignalInstance, ExperimentInstance, ModelInstance, PortfolioOptimizerInstance, or BacktestInstance. Covers definition references, config patterns, composition, flow execution pairing, and scheduling.

Follow plan.md-driven development workflow with strict TDD discipline. Use when the user says "go", references plan.md, asks to proceed with next test or task, create implementation plan, or needs step-by-step test-driven development from a plan file. Enforces one test at a time with explicit user control.

Efficiently fix large batches (10-15+) of existing bugs by reading failing tests, fixing code in batches, and validating once per batch. Use when user has multiple failing tests, says "fix bugs/failing tests", or bug report shows many issues. NOT for test-first development (use TDD skill instead).

The core skill for working within the bigquery-etl repository. Use this skill when understanding project structure, conventions, and common patterns. Works with model-requirements, query-writer, metadata-manager, sql-test-generator, and bigconfig-generator skills.

Test and debug Next.js API routes, validate responses, check authentication, and troubleshoot API errors. Use when testing API endpoints, debugging 500 errors, validating API responses, or checking authentication flows.

Comprehensive research skill using Exa AI tools for web search and code context retrieval. Use when conducting research on technologies, finding code examples, discovering latest tools, or gathering comprehensive information on any topic. Combines web search for articles/news with code search for implementation examples.

Implement comprehensive testing strategies with pytest, fixtures, mocking, and test-driven development for FastAPI applications. Use when writing Python tests, setting up test suites, or implementing testing best practices.

Generate Vitest unit tests following project conventions. Use when user asks to create tests, write test cases, or add test coverage for TypeScript functions.

Expert knowledge for testing Composable Rust applications. Use when writing unit tests for reducers, setting up integration tests with real dependencies, using test utilities (TestStore, FixedClock, mocks), working with testcontainers for PostgreSQL/Redpanda, property-based testing, or questions about testing patterns and best practices.

Guide development following Kent Beck's Test-Driven Development (TDD) using Red → Green → Refactor cycle. Use when writing tests first, implementing features with TDD, need to write failing tests, make tests pass, refactoring after tests pass, following red-green-refactor, fixing defects with tests, or practicing test-driven development methodology.

Comprehensive web application testing patterns with Playwright selectors, wait strategies, and best practices

Fetch and analyze GitHub Actions pipeline errors. Use when the user wants to debug CI/CD failures, check workflow runs, or troubleshoot test failures.

Comprehensive guide for developing full-stack applications using the Django + Vue.js + Flutter starter template.Use this skill when creating new projects from the fullstack-starter-djvurn template, or when working on projects that follow this architecture.Covers: Django app creation, DRF API development, Vue.js components, Flutter mobile development, database migrations,API client generation, testing (TDD), type safety (mypy, TypeScript), code quality enforcement, and Docker-based workflows.Trigger patterns: "create new Django app", "add API endpoint", "build Vue component", "setup Flutter feature","write tests for", "run migrations", "generate API client", "type check", "follow TDD"

Test-Driven Development skill. Generates unit tests before implementation. Adapts to project type (Chrome extension, React, Express, Python, etc.). Reads/updates pattern library.

PolicyEngine testing patterns - YAML test structure, naming conventions, period handling, and quality standards

Master testing strategies and quality assurance practices.

Persistent browser automation via Playwright daemon. Keep a browser window open and send it commands (navigate, execute JS, inspect console). Perfect for interactive debugging, development, and testing web applications. Use when you need to interact with a browser repeatedly without opening/closing it.

Evaluate browser screenshots and page state for errors. Use when verifying features work correctly, detecting error conditions, or validating UI state during browser testing.

This skill should be used when seeding databases with realistic fake data for development, testing, or staging environments. Supports PostgreSQL, MySQL, SQLite, MongoDB with ORM-based seeding (SQLAlchemy, Django, Prisma) and Faker library for generating realistic test data. Use when the user needs to populate databases with sample data, create test fixtures, or set up development/staging environments with realistic data.

A/B testing patterns for lead generation sites. Client-side experiments, Google Optimize alternative, analytics integration. Use for conversion optimization.