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diff --git a/vendor/symfony/config/Tests/DependencyInjection/ConfigCachePassTest.php b/vendor/symfony/config/Tests/DependencyInjection/ConfigCachePassTest.php
new file mode 100644
index 000000000..c0a064a7a
--- /dev/null
+++ b/vendor/symfony/config/Tests/DependencyInjection/ConfigCachePassTest.php
@@ -0,0 +1,59 @@
+<?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\Config\Tests\DependencyInjection;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
+use Symfony\Component\Config\DependencyInjection\ConfigCachePass;
+
+/**
+ * @group legacy
+ */
+class ConfigCachePassTest extends TestCase
+{
+    public function testThatCheckersAreProcessedInPriorityOrder()
+    {
+        $container = new ContainerBuilder();
+
+        $definition = $container->register('config_cache_factory')->addArgument(null);
+        $container->register('checker_2')->addTag('config_cache.resource_checker', array('priority' => 100));
+        $container->register('checker_1')->addTag('config_cache.resource_checker', array('priority' => 200));
+        $container->register('checker_3')->addTag('config_cache.resource_checker');
+
+        $pass = new ConfigCachePass();
+        $pass->process($container);
+
+        $expected = new IteratorArgument(array(
+            new Reference('checker_1'),
+            new Reference('checker_2'),
+            new Reference('checker_3'),
+        ));
+        $this->assertEquals($expected, $definition->getArgument(0));
+    }
+
+    public function testThatCheckersCanBeMissing()
+    {
+        $container = new ContainerBuilder();
+
+        $definitionsBefore = count($container->getDefinitions());
+        $aliasesBefore = count($container->getAliases());
+
+        $pass = new ConfigCachePass();
+        $pass->process($container);
+
+        // the container is untouched (i.e. no new definitions or aliases)
+        $this->assertCount($definitionsBefore, $container->getDefinitions());
+        $this->assertCount($aliasesBefore, $container->getAliases());
+    }
+}