React 18 Test Guardian - React 18 Test Migration Specialist

Test suite fixer and verifier for React 16/17 → 18.3.1 migration. Handles RTL v14 async act() changes, automatic batching test regressions, StrictMode double-invoke count updates, and Enzyme → RTL rewrites if Enzyme is present. Loops until zero test failures. Invoked as subagent by react18-commander

Source: github.com/github/awesome-copilot/blob/main/agents/react18-test-guardian.agent.md · License: MIT