Vitest + '$app/environment' doesnt work with default configuration

[Flunsi]

Reproduction

1. Create a SvelteKit skeleton project (with create-svelte 5.0.5) and select the option_Vitest_
2. In the provided test-file (index.test.ts), include the following line:
   import { browser } from '$app/environment'
3. npm run test now gives the following error:
   Error: Cannot find package '__sveltekit' imported from \node_modules@sveltejs\kit\src\runtime\app\environment.js

"Dirty" fix

In vite.config.ts setting the following option:
test.server.deps.inline = ['@sveltejs/kit']

Questions

• I'm pretty new to webdev, so my first question is, is this fix ok or is there a better way for this?
• Why isnt this handled by create-svelte? To me it looks like this should work out of the box.

[Flunsi]

Am I at the wrong place or are my questions too basic or too advanced?

Perhaps you need the reason why I'm asking the original questions:
I have some "utility"-functions that run on the server and in the browser and sometimes I need to check if the code is run in the browser.
Since Vitest is offered when creating a svelte-project, I thought I might as well use it for my utility-functions.
So, that's where I'm coming from.

But it looks like I have to mock browser or write my own browserCheck, which is pretty silly.