TypeError: Cannot read properties of undefined (reading '$set') in vitest of sveltekit component

[ar4hc]

i have a few test for a few sveltekit components and vitest complain at the end about root.$set not defined.
Which is probably true as i only test components and never a whole page, whatever that is in vitest with sveltekit context...

It doesn't matter which test(s) i run, it comes after any run.

I do mock a lot of stuff in the setup, like the "$app" and "$navigation" and MSW and some env vars. (most stuff taken from davipon

Is this something to worry?
How to avoid this? Can i mock root in the setup? Should i? How?

The error:

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ Unhandled Errors ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯

Vitest caught 1 unhandled error during the test run.
This might cause false positive tests. Resolve unhandled errors to make sure your tests are not affected.

⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ Unhandled Rejection ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
TypeError: Cannot read properties of undefined (reading '$set')
 ❯ Module.applyAction node_modules/.pnpm/@[email protected]_@[email protected][email protected][email protected]_@types+node@_sho4bexov2rcm6kasmhs4uc76i/node_modules/@sveltejs/kit/src/runtime/client/client.js:1955:8
    1953|   _goto(result.location, { invalidateAll: true }, 0);
    1954|  } else {
    1955|   /** @type {Record<string, any>} */
       |        ^
    1956|   root.$set({
    1957|    // this brings Svelte's view of the world in line with SvelteKit's
 ❯ fallback_callback node_modules/.pnpm/@[email protected]_@[email protected][email protected][email protected]_@types+node@_sho4bexov2rcm6kasmhs4uc76i/node_modules/@sveltejs/kit/src/runtime/app/forms.js:113:26
 ❯ src/lib/components/SearchCustomer.svelte:2124:4