Can I use Laravel's Gate facade for mocking permissions in tests

Here's an example of how you can use the `Gate` facade to mock permissions in your tests:

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

use Illuminate\Auth\Access\Gate;
use Illuminate\Contracts\Auth\Access\Gate as GateContract;
use Mockery;
use Tests\TestCase;

class AuthorizationTest extends TestCase
{
    public function testUpdatePostAuthorization()
    {
        // Mock the Gate instance
        $gate = Mockery::mock(GateContract::class);
        $gate->shouldReceive('allows')
             ->with('update', Mockery::any())
             ->andReturn(true);

        // Bind the mocked Gate instance to the application
        $this->app->instance(GateContract::class, $gate);

        // 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 Gate instance
        $gate = Mockery::mock(GateContract::class);
        $gate->shouldReceive('allows')
             ->with('update', Mockery::any())
             ->andReturn(false);

        // Bind the mocked Gate instance to the application
        $this->app->instance(GateContract::class, $gate);

        // 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 `GateContract` and setting expectations on the `allows` method. We then bind the mocked `Gate` instance to the application using the `$this->app->instance()` method.

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

By using the `Gate` facade 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.