test

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.