name: test

#description: Use when you need to run tests for React core. Supports source, www, stable, and experimental channels.

Run tests for the React codebase.

Arguments: - $ARGUMENTS: Channel, flags, and test pattern

Usage Examples: - /test ReactFiberHooks - Run with source channel (default) - /test experimental ReactFiberHooks - Run with experimental channel - /test www ReactFiberHooks - Run with www-modern channel - /test www variant false ReactFiberHooks - Test VARIANT=false - /test stable ReactFiberHooks - Run with stable channel - /test classic ReactFiberHooks - Run with www-classic channel - /test watch ReactFiberHooks - Run in watch mode (TDD)

Release Channels: - (default) - Source/canary channel, uses ReactFeatureFlags.js defaults - experimental - Source/experimental channel with EXPERIMENTAL flags = true - www - www-modern channel with VARIANT flags = true - www variant false - www channel with VARIANT flags = false - stable - What ships to npm - classic - Legacy www-classic (rarely needed)

Instructions: 1. Parse channel from arguments (default: source) 2. Map to yarn command: - (default) → yarn test --silent --no-watchman <pattern> - experimental → yarn test -r=experimental --silent --no-watchman <pattern> - stable → yarn test-stable --silent --no-watchman <pattern> - classic → yarn test-classic --silent --no-watchman <pattern> - www → yarn test-www --silent --no-watchman <pattern> - www variant false → yarn test-www --variant=false --silent --no-watchman <pattern> 3. Report test results and any failures

Hard Rules: 1. Use --silent to see failures - This limits the test output to only failures. 2. Use --no-watchman - This is a common failure in sandboxing.

Common Mistakes: - Running without a pattern - Runs ALL tests, very slow. Always specify a pattern. - Forgetting both www variants - Test www AND www variant false for __VARIANT__ flags. - Test skipped unexpectedly - Check for @gate pragma; see feature-flags skill.