ContainerTest.php

<?php

declare(strict_types=1);

namespace AppTest;

use PHPUnit\Framework\TestCase;
use Psr\Container\ContainerInterface;
use function assert;
use function strpos;

/**
 * @coversNothing
 */
final class ContainerTest extends TestCase
{
    public function testContainer() : void
    {
        $container = require __DIR__ . '/../config/container.php';
        assert($container instanceof ContainerInterface);

        foreach ($container->get('config')['dependencies']['factories'] as $id => $factory) {
            if (strpos($id, 'App\\') !== 0) { // only instanciate services in application namespace, no third party libs
                continue;
            }

            $instance = $container->get($id);

            self::assertInstanceOf($id, $instance);
        }
    }
}