Architecture namespace expectations with ->each

[samlev]

I can make expectations on a namespace, and the built-in expectations like ->toBeClasses() will correctly be checked for all of the items inside the namespace, but there's no way that I can find to then make other expectations on the classes in the namespace.

X/Y Problem

What I'm trying to achieve is an expectation that all of the Model classes in namespace exist in a constant that is used for morph maps:

class DatabaseServiceProvider  extends ServiceProvider
{
    public const array OPTION_MORPHS = [
        'foo' => \App\Models\Options\Foo::class,
        'bar' => \App\Models\Options\Bar::class,
        'baz' => \App\Models\Options\Baz::class,
    ];
 
    public function boot(): void
    {
        Relation::morphMap(self::OPTION_MORPHS);
    }
}

// Then the test
arch('option models are registered in database morph map')
    ->expect('App\Models\Options')
    ->toBeIn(\App\Providers\DatabaseServiceProvider::OPTION_MORPHS);

That doesn't work because 'App\Models\Options' isn't in the array, so I went "Ok, makes sense" so I first tried to add ->each to iterate over the classes, and when that didn't work I added ->classes() to target the classes, but still no.

In the short term I've added this:

expect()->extend('toBeMapped', function (array $map): \Pest\Expectation {
    Targeted::make(
        $this,
        fn (ObjectDescription $object): bool => in_array($object->name, $map),
        'to be in map',
        FileLineFinder::where(fn (string $line): bool => str_contains($line, 'class')),
    );

    return $this;
});

Which works, but it's using internal classes (Targeted and FileLineFinder), and doesn't format the error correctly - it says the filename doesn't exist in the map, instead of the class, which is fine for my purposes.

So what are the options here? Adding each class manually to the test won't work because the test is meant to catch when a new class is added without being added to the morph map.