Add Composer autoloading functions and PHPStan for testing

vendor/symfony/contracts/Tests/Service/ServiceSubscriberTraitTest.php

@@ -0,0 +1,65 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Contracts\Tests\Service;
+
+use PHPUnit\Framework\TestCase;
+use Psr\Container\ContainerInterface;
+use Symfony\Contracts\Service\ServiceLocatorTrait;
+use Symfony\Contracts\Service\ServiceSubscriberInterface;
+use Symfony\Contracts\Service\ServiceSubscriberTrait;
+
+class ServiceSubscriberTraitTest extends TestCase
+{
+    public function testMethodsOnParentsAndChildrenAreIgnoredInGetSubscribedServices()
+    {
+        $expected = array(TestService::class.'::aService' => '?Symfony\Contracts\Tests\Service\Service2');
+
+        $this->assertEquals($expected, ChildTestService::getSubscribedServices());
+    }
+
+    public function testSetContainerIsCalledOnParent()
+    {
+        $container = new class(array()) implements ContainerInterface {
+            use ServiceLocatorTrait;
+        };
+
+        $this->assertSame($container, (new TestService())->setContainer($container));
+    }
+}
+
+class ParentTestService
+{
+    public function aParentService(): Service1
+    {
+    }
+
+    public function setContainer(ContainerInterface $container)
+    {
+        return $container;
+    }
+}
+
+class TestService extends ParentTestService implements ServiceSubscriberInterface
+{
+    use ServiceSubscriberTrait;
+
+    public function aService(): Service2
+    {
+    }
+}
+
+class ChildTestService extends TestService
+{
+    public function aChildService(): Service3
+    {
+    }
+}