mcpField
T
test

test

github.com/reactTesting & quality251.7k1.2k installsUpdated today
Repository

About test

A React testing skill that runs a named test pattern against a selected release channel, with options for watch mode and www variants.

Key features

  1. 01Channel-specific test commands
  2. 02Test pattern and flag arguments
  3. 03Watch mode for TDD
  4. 04Reports test results and failures

Use cases

  1. 01Run a React test in the default channel
  2. 02Check tests against experimental or stable builds
  3. 03Test www behavior with both variant flag values

Install

Copy the command and run it in a terminal.

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

After installing, type/testin Claude Code to confirm it loaded.

Details

From the project README

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.

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