Add tests

[mattstauffer]

I know I slapped this thing together on a stream really quickly, but now that other folks are using it, I think it's time to treat it like a Real Tighten Package ™ and write some tests and stuff :)

[mattstauffer]

Since we just converted this to Inertia, they'll need to be Inertia tests.

Here's a sample from the docs:

use Inertia\Testing\Assert;

class PodcastsControllerTest extends TestCase
{
    public function test_can_view_podcast()
    {
        $this->get('/podcasts/41')
            ->assertInertia(fn (Assert $page) => $page
                ->component('Podcasts/Show')
                ->has('podcast', fn (Assert $page) => $page
                    ->where('id', $podcast->id)
                    ->where('subject', 'The Laravel Podcast')
                    ->where('description', 'The Laravel Podcast brings you Laravel and PHP development news and discussion.')
                    ->has('seasons', 4)
                    ->has('seasons.4.episodes', 21)
                    ->has('host', fn (Assert $page) => $page
                        ->where('id', 1)
                        ->where('name', 'Matt Stauffer')
                    )
                    ->has('subscribers', 7, fn (Assert $page) => $page
                        ->where('id', 2)
                        ->where('name', 'Claudio Dekker')
                        ->where('platform', 'Apple Podcasts')
                        ->etc()
                        ->missing('email')
                        ->missing('password')
                    )
                )
            );
    }
}

They don't have full docs yet but the testing helpers are imported from a package with docs, so we can use the docs from the package for now:

https://github.com/claudiodekker/inertia-laravel-testing/tree/a5ac8d372e456534f5ad2e07a6875e0f27c6a73d