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diff --git a/vendor/symfony/dependency-injection/Tests/Compiler/RegisterServiceSubscribersPassTest.php b/vendor/symfony/dependency-injection/Tests/Compiler/RegisterServiceSubscribersPassTest.php
new file mode 100644
index 000000000..42f994e82
--- /dev/null
+++ b/vendor/symfony/dependency-injection/Tests/Compiler/RegisterServiceSubscribersPassTest.php
@@ -0,0 +1,139 @@
+<?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\Component\DependencyInjection\Tests\Compiler;
+
+use PHPUnit\Framework\TestCase;
+use Psr\Container\ContainerInterface as PsrContainerInterface;
+use Symfony\Component\DependencyInjection\Argument\ServiceClosureArgument;
+use Symfony\Component\DependencyInjection\Compiler\RegisterServiceSubscribersPass;
+use Symfony\Component\DependencyInjection\Compiler\ResolveServiceSubscribersPass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\ServiceLocator;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\CustomDefinition;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber;
+use Symfony\Component\DependencyInjection\TypedReference;
+
+require_once __DIR__.'/../Fixtures/includes/classes.php';
+
+class RegisterServiceSubscribersPassTest extends TestCase
+{
+    /**
+     * @expectedException \Symfony\Component\DependencyInjection\Exception\InvalidArgumentException
+     * @expectedExceptionMessage Service "foo" must implement interface "Symfony\Component\DependencyInjection\ServiceSubscriberInterface".
+     */
+    public function testInvalidClass()
+    {
+        $container = new ContainerBuilder();
+
+        $container->register('foo', CustomDefinition::class)
+            ->addTag('container.service_subscriber')
+        ;
+
+        (new RegisterServiceSubscribersPass())->process($container);
+        (new ResolveServiceSubscribersPass())->process($container);
+    }
+
+    /**
+     * @expectedException \Symfony\Component\DependencyInjection\Exception\InvalidArgumentException
+     * @expectedExceptionMessage The "container.service_subscriber" tag accepts only the "key" and "id" attributes, "bar" given for service "foo".
+     */
+    public function testInvalidAttributes()
+    {
+        $container = new ContainerBuilder();
+
+        $container->register('foo', TestServiceSubscriber::class)
+            ->addTag('container.service_subscriber', array('bar' => '123'))
+        ;
+
+        (new RegisterServiceSubscribersPass())->process($container);
+        (new ResolveServiceSubscribersPass())->process($container);
+    }
+
+    public function testNoAttributes()
+    {
+        $container = new ContainerBuilder();
+
+        $container->register('foo', TestServiceSubscriber::class)
+            ->addArgument(new Reference(PsrContainerInterface::class))
+            ->addTag('container.service_subscriber')
+        ;
+
+        (new RegisterServiceSubscribersPass())->process($container);
+        (new ResolveServiceSubscribersPass())->process($container);
+
+        $foo = $container->getDefinition('foo');
+        $locator = $container->getDefinition((string) $foo->getArgument(0));
+
+        $this->assertFalse($locator->isPublic());
+        $this->assertSame(ServiceLocator::class, $locator->getClass());
+
+        $expected = array(
+            TestServiceSubscriber::class => new ServiceClosureArgument(new TypedReference(TestServiceSubscriber::class, TestServiceSubscriber::class, TestServiceSubscriber::class)),
+            CustomDefinition::class => new ServiceClosureArgument(new TypedReference(CustomDefinition::class, CustomDefinition::class, TestServiceSubscriber::class, ContainerInterface::IGNORE_ON_INVALID_REFERENCE)),
+            'bar' => new ServiceClosureArgument(new TypedReference(CustomDefinition::class, CustomDefinition::class, TestServiceSubscriber::class)),
+            'baz' => new ServiceClosureArgument(new TypedReference(CustomDefinition::class, CustomDefinition::class, TestServiceSubscriber::class, ContainerInterface::IGNORE_ON_INVALID_REFERENCE)),
+        );
+
+        $this->assertEquals($expected, $container->getDefinition((string) $locator->getFactory()[0])->getArgument(0));
+    }
+
+    public function testWithAttributes()
+    {
+        $container = new ContainerBuilder();
+
+        $container->register('foo', TestServiceSubscriber::class)
+            ->setAutowired(true)
+            ->addArgument(new Reference(PsrContainerInterface::class))
+            ->addTag('container.service_subscriber', array('key' => 'bar', 'id' => 'bar'))
+            ->addTag('container.service_subscriber', array('key' => 'bar', 'id' => 'baz')) // should be ignored: the first wins
+        ;
+
+        (new RegisterServiceSubscribersPass())->process($container);
+        (new ResolveServiceSubscribersPass())->process($container);
+
+        $foo = $container->getDefinition('foo');
+        $locator = $container->getDefinition((string) $foo->getArgument(0));
+
+        $this->assertFalse($locator->isPublic());
+        $this->assertSame(ServiceLocator::class, $locator->getClass());
+
+        $expected = array(
+            TestServiceSubscriber::class => new ServiceClosureArgument(new TypedReference(TestServiceSubscriber::class, TestServiceSubscriber::class, TestServiceSubscriber::class)),
+            CustomDefinition::class => new ServiceClosureArgument(new TypedReference(CustomDefinition::class, CustomDefinition::class, TestServiceSubscriber::class, ContainerInterface::IGNORE_ON_INVALID_REFERENCE)),
+            'bar' => new ServiceClosureArgument(new TypedReference('bar', CustomDefinition::class, TestServiceSubscriber::class)),
+            'baz' => new ServiceClosureArgument(new TypedReference(CustomDefinition::class, CustomDefinition::class, TestServiceSubscriber::class, ContainerInterface::IGNORE_ON_INVALID_REFERENCE)),
+        );
+
+        $this->assertEquals($expected, $container->getDefinition((string) $locator->getFactory()[0])->getArgument(0));
+    }
+
+    /**
+     * @expectedException \Symfony\Component\DependencyInjection\Exception\InvalidArgumentException
+     * @expectedExceptionMessage Service key "test" does not exist in the map returned by "Symfony\Component\DependencyInjection\Tests\Fixtures\TestServiceSubscriber::getSubscribedServices()" for service "foo_service".
+     */
+    public function testExtraServiceSubscriber()
+    {
+        $container = new ContainerBuilder();
+        $container->register('foo_service', TestServiceSubscriber::class)
+            ->setAutowired(true)
+            ->addArgument(new Reference(PsrContainerInterface::class))
+            ->addTag('container.service_subscriber', array(
+                'key' => 'test',
+                'id' => TestServiceSubscriber::class,
+            ))
+        ;
+        $container->register(TestServiceSubscriber::class, TestServiceSubscriber::class);
+        $container->compile();
+    }
+}