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 <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>

• 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.