— 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.