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/test

@9ffcb46 official
by reactreact/react252k stars
51,563
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Use when you need to run tests for React core. Supports source, www, stable, and experimental channels.

Use this Skill: https://skilld.dev/gh/react/react/test

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SKILL.md

≈27 tokens for metadata: the name and description. ≈489 when used: this file.

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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.

Source: SKILL.md on GitHub

Skill behaviors

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Third-party checks

1 warning4mo3 checks · Risk MEDIUM
  • Gen Agent Trust Hub4mo

    The skill executes React codebase tests using yarn commands but is susceptible to command injection because it directly inserts user-provided arguments into the shell execution path without sanitization.

  • Socket4mo

    No alerts

  • Snyk4mo

    Risk: LOW · No issues

Provenance

Signed by skilld at 9ffcb46. This ties the file your Agent reads to that commit on GitHub. It does not review the instructions.

Last checked against GitHub 15 hours ago.

Activeupdated 9 months ago

Topics

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What it does

Runs tests for the React codebase across multiple release channels (source, experimental, www, stable, classic) with support for watch mode and variant flags. Use this skill when testing React core changes against different configurations and feature gates.

Generated from the current SKILL.md.

Frequently asked

What channels can I test against?
Six channels: source (default), experimental, www (www-modern), www with variant=false, stable (npm release), and classic (legacy). Each maps to different feature flags and yarn commands.
Do I need to specify a test pattern?
Yes. Always provide a pattern like `ReactFiberHooks`. Running without one executes all tests, which is slow.
What do the --silent and --no-watchman flags do?
--silent limits output to only failures. --no-watchman is required to avoid common sandboxing failures and is applied to all test runs.
How do I test the __VARIANT__ flag behavior?
Run tests against both the `www` channel (variant=true by default) and `www variant false` channel to cover both variants.

Generated from the current SKILL.md. These answers refresh after source changes.