Add ShouldHaveAttribute assertion

[gertjuhh]

This adds a shouldHaveAttribute assertion.

<?php declare(strict_types=1);

namespace App;

use Doctrine\ORM\Mapping\Entity;
use PHPat\Selector\Selector;
use PHPat\Test\Builder\Rule;
use PHPat\Test\PHPat;
use Symfony\Component\HttpKernel\Attribute\AsController;

class ArchitectureTest
{
    public function test_controllers_have_as_controller_attribute(): Rule
    {
        return PHPat::rule()
            ->classes(Selector::inNamespace('App\Controller'))
            ->shouldHaveAttribute()
            ->classes(
                Selector::classname(AsController::class),
            );
    }

    public function test_entities_have_entity_attribute(): Rule
    {
        return PHPat::rule()
            ->classes(Selector::inNamespace('App\Entity'))
            ->shouldHaveAttribute()
            ->classes(
                Selector::classname(Entity::class),
            );
    }
}

[carlosas]

Hi @gertjuhh, thanks for the contribution.

The implementation and the tests look great 🙌
I realized I didn't use the proper term for Attributes in the hasAttribute Selector. I will change that selector to appliesAttribute. Could you also use the term to "apply" instead of "have"? then the error message should be %s should apply the attribute %s

I'm going to do some manual testing of the assertion in the meantime :)

[gertjuhh]

Hi @carlosas, thanks for the review.
I just pushed the requested changes.