assertReturnsResource (Laravel test helper)

AppServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Illuminate\Foundation\Testing\TestResponse;
use Illuminate\Http\Request;
use Illuminate\Foundation\Testing\Assert as PHPUnit;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        if ($this->app->environment('testing')) {
            $this->addTestResponseMacros();
        }
    }

    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        //
    }

    /**
     * Add test response macros.
     *
     * @return void
     */
    protected function addTestResponseMacros()
    {
        TestResponse::macro('assertReturnsResource', function($resource) {
            // The response has the exact structure of the resource.
            $response = $this->assertJsonStructure([
                'data' => array_keys($resource->resolve())
            ]);

            // The response is the expected model.
            PHPUnit::assertEquals($response->getData()->data->id, $resource->id);

            return $this;
        });
    }
}

ExampleTest.php

<?php

namespace Tests\Feature;

use Tests\TestCase;
use Illuminate\Foundation\Testing\RefreshDatabase;
use App\Models\User;
use App\Http\Resources\UserResource;
use Illuminate\Http\Request;

class GetUserTest extends TestCase
{
    use RefreshDatabase;

    /** @test */
    public function it_returns_the_user_resource()
    {
        $user = factory(User::class)->create();

        $this->getJson('users/'.user->id)
            ->assertStatus(200)
            ->assertReturnsResource(new UserResource($user));

    }
}

UserController.php

<?php

namespace App\Http\Controllers;

use App\Models\User;
use App\Http\Controllers\Controller;
use App\Http\Resources\UserResource;

class UserController extends Controller
{
    public function show(User $user)
    {
        return new UserResource($user);
    }
}