safe-action-testing — Claude Code skill: next-safe-action tests

What safe-action-testing does

The skill kicks in when you ask for tests around next-safe-action. Your agent gets Vitest patterns for calling a server action directly and asserting on result.data, validationErrors and serverError, plus a section on actions that take bind arguments.

Middleware and hooks have their own parts. For middleware you build a client with a specific chain and stub the session with vi.mock; for hooks the skill uses renderHook from React Testing Library and checks isIdle, isExecuting, hasSucceeded, then calls reset. The helpers flattenValidationErrors and formatValidationErrors are covered, and there is a mock for next/navigation so redirects can be tested.

Bind-argument failures arrive as ActionBindArgsValidationError, so a test has to use rejects.toThrow() instead of reading result.validationErrors. The digest strings on NEXT_REDIRECT are a Next.js internal, and the skill itself flags that they shift between versions.