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diff --git a/vendor/symfony/dependency-injection/Tests/ServiceLocatorTest.php b/vendor/symfony/dependency-injection/Tests/ServiceLocatorTest.php
new file mode 100644
index 000000000..56fac643e
--- /dev/null
+++ b/vendor/symfony/dependency-injection/Tests/ServiceLocatorTest.php
@@ -0,0 +1,144 @@
+<?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;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\Container;
+use Symfony\Component\DependencyInjection\ServiceLocator;
+use Symfony\Component\DependencyInjection\ServiceSubscriberInterface;
+
+class ServiceLocatorTest extends TestCase
+{
+    public function testHas()
+    {
+        $locator = new ServiceLocator(array(
+            'foo' => function () { return 'bar'; },
+            'bar' => function () { return 'baz'; },
+            function () { return 'dummy'; },
+        ));
+
+        $this->assertTrue($locator->has('foo'));
+        $this->assertTrue($locator->has('bar'));
+        $this->assertFalse($locator->has('dummy'));
+    }
+
+    public function testGet()
+    {
+        $locator = new ServiceLocator(array(
+            'foo' => function () { return 'bar'; },
+            'bar' => function () { return 'baz'; },
+        ));
+
+        $this->assertSame('bar', $locator->get('foo'));
+        $this->assertSame('baz', $locator->get('bar'));
+    }
+
+    public function testGetDoesNotMemoize()
+    {
+        $i = 0;
+        $locator = new ServiceLocator(array(
+            'foo' => function () use (&$i) {
+                ++$i;
+
+                return 'bar';
+            },
+        ));
+
+        $this->assertSame('bar', $locator->get('foo'));
+        $this->assertSame('bar', $locator->get('foo'));
+        $this->assertSame(2, $i);
+    }
+
+    /**
+     * @expectedException        \Psr\Container\NotFoundExceptionInterface
+     * @expectedExceptionMessage Service "dummy" not found: the container inside "Symfony\Component\DependencyInjection\Tests\ServiceLocatorTest" is a smaller service locator that only knows about the "foo" and "bar" services.
+     */
+    public function testGetThrowsOnUndefinedService()
+    {
+        $locator = new ServiceLocator(array(
+            'foo' => function () { return 'bar'; },
+            'bar' => function () { return 'baz'; },
+        ));
+
+        $locator->get('dummy');
+    }
+
+    /**
+     * @expectedException        \Psr\Container\NotFoundExceptionInterface
+     * @expectedExceptionMessage The service "foo" has a dependency on a non-existent service "bar". This locator only knows about the "foo" service.
+     */
+    public function testThrowsOnUndefinedInternalService()
+    {
+        $locator = new ServiceLocator(array(
+            'foo' => function () use (&$locator) { return $locator->get('bar'); },
+        ));
+
+        $locator->get('foo');
+    }
+
+    /**
+     * @expectedException        \Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException
+     * @expectedExceptionMessage Circular reference detected for service "bar", path: "bar -> baz -> bar".
+     */
+    public function testThrowsOnCircularReference()
+    {
+        $locator = new ServiceLocator(array(
+            'foo' => function () use (&$locator) { return $locator->get('bar'); },
+            'bar' => function () use (&$locator) { return $locator->get('baz'); },
+            'baz' => function () use (&$locator) { return $locator->get('bar'); },
+        ));
+
+        $locator->get('foo');
+    }
+
+    /**
+     * @expectedException        \Psr\Container\NotFoundExceptionInterface
+     * @expectedExceptionMessage Service "foo" not found: even though it exists in the app's container, the container inside "caller" is a smaller service locator that only knows about the "bar" service. Unless you need extra laziness, try using dependency injection instead. Otherwise, you need to declare it using "SomeServiceSubscriber::getSubscribedServices()".
+     */
+    public function testThrowsInServiceSubscriber()
+    {
+        $container = new Container();
+        $container->set('foo', new \stdClass());
+        $subscriber = new SomeServiceSubscriber();
+        $subscriber->container = new ServiceLocator(array('bar' => function () {}));
+        $subscriber->container = $subscriber->container->withContext('caller', $container);
+
+        $subscriber->getFoo();
+    }
+
+    public function testInvoke()
+    {
+        $locator = new ServiceLocator(array(
+            'foo' => function () { return 'bar'; },
+            'bar' => function () { return 'baz'; },
+        ));
+
+        $this->assertSame('bar', $locator('foo'));
+        $this->assertSame('baz', $locator('bar'));
+        $this->assertNull($locator('dummy'), '->__invoke() should return null on invalid service');
+    }
+}
+
+class SomeServiceSubscriber implements ServiceSubscriberinterface
+{
+    public $container;
+
+    public function getFoo()
+    {
+        return $this->container->get('foo');
+    }
+
+    public static function getSubscribedServices()
+    {
+        return array('bar' => 'stdClass');
+    }
+}