testing-plugin

Run tests and report results. Detects the project's test framework, executes tests with agentic-optimized flags, and returns a concise summary to the orchestrator.

Property-based testing with Hypothesis for discovering edge cases and validating invariants. Use when testing code with many possible inputs, verifying mathematical properties, testing serialization round-trips, or finding edge cases that example-based tests miss.

Validate test effectiveness with mutation testing using Stryker (TypeScript/JavaScript) and mutmut (Python). Find weak tests that pass despite code mutations. Use when user mentions mutation testing, Stryker, mutmut, test effectiveness, finding weak tests, or improving test quality through mutation analysis.

Playwright CLI browser automation for AI agents. Navigate pages, take screenshots, fill forms, click elements from the command line. Use when automating browser tasks with shell access. Prefer over Playwright MCP (4-10x more token-efficient).

Playwright end-to-end testing for web applications. Cross-browser testing (Chromium, Firefox, WebKit), visual regression, API testing, mobile emulation. Use when writing E2E tests, testing across browsers, or setting up automated UI testing workflows.

Property-based testing with fast-check (TypeScript/JavaScript) and Hypothesis (Python). Generate test cases automatically, find edge cases, and test mathematical properties. Use when user mentions property-based testing, fast-check, Hypothesis, generating test data, QuickCheck-style testing, or finding edge cases automatically.

Analyze test results and create systematic fix plan with subagent delegation

Consult test-architecture agent for testing strategy and design

Run single test file with fail-fast mode for rapid iteration

Complete test suite including integration and E2E tests

Detect test smells, overmocking, flaky tests, and coverage issues. Analyze test effectiveness, maintainability, and reliability. Use when reviewing tests or improving test quality.

Fast unit tests only (skip slow/integration/E2E)

Show test status from last run (without re-executing)

- Project indicators: !`find . -maxdepth 1 \( -name 'pyproject.toml' -o -name 'package.json' -o -name 'Cargo.toml' -o -name 'go.mod' \)`

- Package files: !`find . -maxdepth 1 \( -name "package.json" -o -name "pyproject.toml" -o -name "setup.py" -o -name "go.mod" -o -name "Cargo.toml" \) -type f`

Automatic selection of appropriate test tiers based on change scope. Guides unit tests for small changes, full suite for larger changes. Use when running tests, discussing testing strategy, or after code modifications.

Vitest test runner for JavaScript and TypeScript. Fast, modern alternative to Jest. Vite-native, ESM support, watch mode, UI mode, coverage, mocking, snapshot testing. Use when setting up tests for Vite projects, migrating from Jest, or needing fast test execution.