[9.x] Update Vite mock to return empty array for preloadedAssets

[jryd]

TL;DR

The Vite mock that is used when using $this->withoutVite() inside tests uses __call to proxy all method calls that aren't explicitly defined to return an empty string.

This conflicts with the \Illuminate\Http\Middleware\AddLinkHeadersForPreloadedAssets::class middleware which expects this to be an empty array.

Long Version

I recently created a new Laravel project and installed Breeze.
I'm using Vue and Inertia and bootstrapped this through Breeze.

We've been writing tests as we've gone and this has all worked fine locally.

Today, I added a CI workflow for our project, via GitHub Actions, and got failures.

I was not installing and building assets, and it was failing due to a missing Vite manifest.

I added $this->withoutVite() to the base TestCase.php and then saw failures due to the \Illuminate\Http\Middleware\AddLinkHeadersForPreloadedAssets::class middleware as the assets were not coming through as an empty array but an empty string.

Looking under the hood, the mock that exists in the InteractsWithContainer, I can see that this will be due to __call forcing a string to return.

I've added a test to the InteractsWithContainerTest that highlights the issue.