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test

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by facebook · part of react/react

Run tests for React codebase across multiple release channels and configurations. Supports six release channels: source (default), experimental, www, www with variant false, stable, and classic, each with distinct feature flag configurations Accepts test patterns, watch mode for TDD, and variant flags to test different code paths Requires explicit test pattern argument to avoid running the entire test suite; uses --silent flag to surface failures and --no-watchman for sandboxing...

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🔒 Repo-maintenance skill. It exists to help maintain react/react itself — it's only useful if you contribute code to that project.

Run tests for React codebase across multiple release channels and configurations. Supports six release channels: source (default), experimental, www, www with variant false, stable, and classic, each with distinct feature flag configurations Accepts test patterns, watch mode for TDD, and variant flags to test different code paths Requires explicit test pattern argument to avoid running the entire test suite; uses --silent flag to surface failures and --no-watchman for sandboxing...

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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.