AutowireTest.php

<?php

namespace Drupal\KernelTests\Core\DependencyInjection;

use Drupal\autowire_test\TestInjection;
use Drupal\autowire_test\TestInjection2;
use Drupal\autowire_test\TestService;
use Drupal\KernelTests\KernelTestBase;

/**
 * Tests auto-wiring services.
 *
 * @group DependencyInjection
 */
class AutowireTest extends KernelTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected static $modules = [
        'autowire_test',
    ];
    
    /**
     * Tests that 'autowire_test.service' has its dependencies injected.
     */
    public function testAutowire() : void {
        // Ensure an autowired interface works.
        $this->assertInstanceOf(TestInjection::class, $this->container
            ->get(TestService::class)
            ->getTestInjection());
        // Ensure an autowired class works.
        $this->assertInstanceOf(TestInjection2::class, $this->container
            ->get(TestService::class)
            ->getTestInjection2());
    }

}