Testing Patterns

Write and run tests across languages and frameworks. Use when setting up test suites, writing unit/integration/E2E tests, measuring coverage, mocking dependencies, or debugging test failures. Covers Node.js (Jest/Vitest), Python (pytest), Go, Rust, and Bash.

Practical regex patterns across languages and use cases. Use when validating input (email, URL, IP), parsing log lines, extracting data from text, refactoring code with search-and-replace, or debugging why a regex doesn't match.

Testing patterns for Zod schemas using Jest and Vitest. Covers schema correctness testing, mock data generation, error assertion patterns, integration testin...

Jest best practices, patterns, and API guidance for JavaScript/TypeScript testing. Covers mock design, async testing, matchers, timer mocks, snapshots, modul...

Writes and runs tests (unit, integration, E2E), performs linting, and auto-fixes failures

Guide Java changes with minimal edits, verify using unit/integration tests as needed, and provide a PR-ready summary including plans, changes, test results,...