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diff --git a/vendor/symfony/dependency-injection/Tests/Compiler/ResolveReferencesToAliasesPassTest.php b/vendor/symfony/dependency-injection/Tests/Compiler/ResolveReferencesToAliasesPassTest.php
new file mode 100644
index 000000000..aaf2f5593
--- /dev/null
+++ b/vendor/symfony/dependency-injection/Tests/Compiler/ResolveReferencesToAliasesPassTest.php
@@ -0,0 +1,109 @@
+<?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 Symfony\Component\DependencyInjection\Alias;
+use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\DependencyInjection\Compiler\ResolveReferencesToAliasesPass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+class ResolveReferencesToAliasesPassTest extends TestCase
+{
+    public function testProcess()
+    {
+        $container = new ContainerBuilder();
+        $container->setAlias('bar', 'foo');
+        $def = $container
+            ->register('moo')
+            ->setArguments(array(new Reference('bar')))
+        ;
+
+        $this->process($container);
+
+        $arguments = $def->getArguments();
+        $this->assertEquals('foo', (string) $arguments[0]);
+    }
+
+    public function testProcessRecursively()
+    {
+        $container = new ContainerBuilder();
+        $container->setAlias('bar', 'foo');
+        $container->setAlias('moo', 'bar');
+        $def = $container
+            ->register('foobar')
+            ->setArguments(array(new Reference('moo')))
+        ;
+
+        $this->process($container);
+
+        $arguments = $def->getArguments();
+        $this->assertEquals('foo', (string) $arguments[0]);
+    }
+
+    /**
+     * @expectedException \Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException
+     */
+    public function testAliasCircularReference()
+    {
+        $container = new ContainerBuilder();
+        $container->setAlias('bar', 'foo');
+        $container->setAlias('foo', 'bar');
+        $this->process($container);
+    }
+
+    public function testResolveFactory()
+    {
+        $container = new ContainerBuilder();
+        $container->register('factory', 'Factory');
+        $container->setAlias('factory_alias', new Alias('factory'));
+        $foo = new Definition();
+        $foo->setFactory(array(new Reference('factory_alias'), 'createFoo'));
+        $container->setDefinition('foo', $foo);
+        $bar = new Definition();
+        $bar->setFactory(array('Factory', 'createFoo'));
+        $container->setDefinition('bar', $bar);
+
+        $this->process($container);
+
+        $resolvedFooFactory = $container->getDefinition('foo')->getFactory();
+        $resolvedBarFactory = $container->getDefinition('bar')->getFactory();
+
+        $this->assertSame('factory', (string) $resolvedFooFactory[0]);
+        $this->assertSame('Factory', (string) $resolvedBarFactory[0]);
+    }
+
+    /**
+     * @group legacy
+     */
+    public function testResolveFactoryService()
+    {
+        $container = new ContainerBuilder();
+        $container->register('factory', 'Factory');
+        $container->setAlias('factory_alias', new Alias('factory'));
+        $foo = new Definition();
+        $foo->setFactoryService('factory_alias');
+        $foo->setFactoryMethod('createFoo');
+        $container->setDefinition('foo', $foo);
+
+        $this->process($container);
+
+        $this->assertSame('factory', $foo->getFactoryService());
+    }
+
+    protected function process(ContainerBuilder $container)
+    {
+        $pass = new ResolveReferencesToAliasesPass();
+        $pass->process($container);
+    }
+}