Testing next-safe-action

Testing next-safe-action: Server actions are async functions — call them directly in tests:

This skill provides `vitest` code examples for testing `next-safe-action` server actions directly, actions with bind arguments, middleware, and React hooks (`useAction`). It also demonstrates testing validation error utilities and mocking `next/navigation` errors. It outlines test file organization and provides `pnpm` and `npx vitest` commands to run tests.