Writing HMR/Dev Server Tests Dev server tests validate hot-reloading robustness and reliability. File Structure - - shared utilities: , , , class, class - - subprocess for (page loading, IPC queries) - - dev server and hot reload tests - - tests running on both dev and production mode Test Categories - - DevServer-specific bundling bugs - - CSS bundling issues - - development mode plugins - - library compatibility (prefer concrete bugs over full package tests) - - ESM features in development - - HTML file handling - - React, react-refresh transform, server components - - source map correctnes…