test

Original：🇺🇸 English

Translated

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

2installs

Added on2026-02-04

NPX Install

npx skill4agent add facebook/react test

Run tests for the React codebase.

Arguments:

Usage Examples:

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:

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>

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.