vitest does not resolve nitro (h3) auto-imports

[pmwmedia]

Environment

• Operating System: Linux
• Node Version: v18.18.0
• Nuxt Version: 3.11.2
• CLI Version: 3.11.1
• Nitro Version: 2.9.6
• Package Manager: npm@10.2.3
• Builder: -
• User Config: devtools
• Runtime Modules: -
• Build Modules: -

Reproduction

https://stackblitz.com/edit/github-xdspn8

Describe the bug

It is impossible to test server API and server route implementations directly, because vitest does not auto import nitro (h3) functions like e.g. defineEventHandler().

When executing the test in the linked minimal reproduction, I receive this error:

FAIL  test/server/routes/something.spec.ts [ test/server/routes/something.spec.ts ]
ReferenceError: defineEventHandler is not defined
 ❯ eval server/routes/something.ts:1:217
 ❯ eval test/server/routes/something.spec.ts:2:31

Additional context

server/routes/something.ts

export default defineEventHandler(() => 'OK');

test/routes/something.spec.ts

import { it } from 'vitest';
import handler from '../../../server/routes/something';

it('should return OK', () => {
  const response = handler({} as any);
  expect(response).toBe('OK');
});

Logs

No response

[danielroe]

Yes, the vitest environment is a client environment.

We can track nitro environment via https://github.com/nuxt/test-utils/issues/531.