🎯

test

🎯Skill

from facebook/react

What it does

Runs React codebase tests across different release channels with configurable flags and test patterns.

test

Installation

Install skill:

npx skills add https://github.com/facebook/react --skill test

Last UpdatedJan 26, 2026

View on GitHub Back to Skills

Skill Details

SKILL.md

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

Overview

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:

Parse channel from arguments (default: source)
Map to yarn command:

- (default) → yarn test --silent --no-watchman

- experimental → yarn test -r=experimental --silent --no-watchman

- stable → yarn test-stable --silent --no-watchman

- classic → yarn test-classic --silent --no-watchman

- www → yarn test-www --silent --no-watchman

- www variant false → yarn test-www --variant=false --silent --no-watchman

Report test results and any failures

Hard Rules:

Use --silent to see failures - This limits the test output to only failures.
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.

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