Exposing vue3 plugin to allow import to other script for testing purpose

[stephenkhoo]

Currently we're trying to setup vitest for vue3 components integrating with inertiajs.
We use $page, $inertia which is installed through inertiajs plugin.
However, in the tests, we only use mount from @vue/test-utils which will not run entire inertia app
It can setup with config.globals.plugins if we can do something like
import { plugin as InertiaPlugin } from '@inertiajs/vue3'

I think in earlier time, @inertiajs/inertia-vue3 we have access to the plugin.
But now it is no longer exposed for import directly.

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This is the attempt to run vitest for vue3 app integrating inertiajs.
If there's better way to run test interacting with inertiajs part in vitest, please share with me also.