From billy-milligan
Unit testing patterns: Vitest config with v8 coverage, Testing Library behavior testing, MSW for HTTP mocking (vs jest.mock), it.each parametrized tests, spies vs mocks vs stubs, testing async code, snapshot testing guidelines. Use when writing unit and component tests.
npx claudepluginhub rnavarych/alpha-engineer --plugin billy-milliganThis skill is limited to using the following tools:
- Setting up Vitest or Jest for a new project
Designs and optimizes AI agent action spaces, tool definitions, observation formats, error recovery, and context for higher task completion rates.
Designs, implements, and audits WCAG 2.2 AA accessible UIs for Web (ARIA/HTML5), iOS (SwiftUI traits), and Android (Compose semantics). Audits code for compliance gaps.
Compares coding agents like Claude Code and Aider on custom YAML-defined codebase tasks using git worktrees, measuring pass rate, cost, time, and consistency.
references/vitest-config.md — globals, environment, coverage thresholds, thread pool, MSW setupreferences/business-logic-testing.md — pure function tests, AAA pattern, it.each parametrized testsreferences/msw-http-mocking.md — handlers setup, server lifecycle, per-test handler overridesreferences/async-testing.md — await patterns, rejected promise assertions, try/catch error checksreferences/testing-library-react.md — render, screen queries, userEvent vs fireEvent, role queries