Can I use Laravel's Policy classes for mocking permissions in tests

Here's an example of how you can use a mocked Policy class to test authorization in your Laravel application:

php
// tests/Unit/AuthorizationTest.php
namespace Tests\Unit;

use App\Policies\PostPolicy;
use Illuminate\Auth\Access\Response;
use Mockery;
use Tests\TestCase;

class AuthorizationTest extends TestCase
{
    public function testUpdatePostAuthorization()
    {
        // Mock the Policy instance
        $policy = Mockery::mock(PostPolicy::class);
        $policy->shouldReceive('update')
               ->with(Mockery::any(), Mockery::any())
               ->andReturn(Response::allow());

        // Bind the mocked Policy instance to the application
        $this->app->instance(PostPolicy::class, $policy);

        // Call the controller method that checks the authorization
        $controller = new \App\Http\Controllers\PostController();
        $controller->authorize('update', new \App\Models\Post());

        // No exception thrown, test passes
    }

    public function testUpdatePostAuthorizationFailure()
    {
        // Mock the Policy instance
        $policy = Mockery::mock(PostPolicy::class);
        $policy->shouldReceive('update')
               ->with(Mockery::any(), Mockery::any())
               ->andReturn(Response::deny('You are not authorized to update this post.'));

        // Bind the mocked Policy instance to the application
        $this->app->instance(PostPolicy::class, $policy);

        // Call the controller method that checks the authorization
        $this->expectException(\Illuminate\Auth\Access\AuthorizationException::class);
        $controller = new \App\Http\Controllers\PostController();
        $controller->authorize('update', new \App\Models\Post());
    }

    public function tearDown(): void
    {
        Mockery::close();
    }
}

In this example, we're using Mockery to create a mock instance of the `PostPolicy` class and setting expectations on the `update` method. We then bind the mocked `PostPolicy` instance to the application using the `$this->app->instance()` method.

When the `PostController` calls the `authorize()` method, it will use the mocked `PostPolicy` instance, allowing us to control the authorization behavior in our tests.

By using the Policy classes for mocking permissions, you can easily test your authorization logic without relying on actual user data or permissions. This makes your tests more isolated and easier to maintain.

Remember to call `Mockery::close()` in the `tearDown` method to ensure that all mocks are properly cleaned up.