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diff --git a/vendor/symfony/http-kernel/Tests/EventListener/SurrogateListenerTest.php b/vendor/symfony/http-kernel/Tests/EventListener/SurrogateListenerTest.php
new file mode 100644
index 000000000..1e79ebe05
--- /dev/null
+++ b/vendor/symfony/http-kernel/Tests/EventListener/SurrogateListenerTest.php
@@ -0,0 +1,67 @@
+
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\Tests\EventListener;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpKernel\HttpCache\Esi;
+use Symfony\Component\HttpKernel\EventListener\SurrogateListener;
+use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\EventDispatcher\EventDispatcher;
+
+class SurrogateListenerTest extends TestCase
+{
+ public function testFilterDoesNothingForSubRequests()
+ {
+ $dispatcher = new EventDispatcher();
+ $kernel = $this->getMockBuilder('Symfony\Component\HttpKernel\HttpKernelInterface')->getMock();
+ $response = new Response('foo ');
+ $listener = new SurrogateListener(new Esi());
+
+ $dispatcher->addListener(KernelEvents::RESPONSE, array($listener, 'onKernelResponse'));
+ $event = new FilterResponseEvent($kernel, new Request(), HttpKernelInterface::SUB_REQUEST, $response);
+ $dispatcher->dispatch(KernelEvents::RESPONSE, $event);
+
+ $this->assertEquals('', $event->getResponse()->headers->get('Surrogate-Control'));
+ }
+
+ public function testFilterWhenThereIsSomeEsiIncludes()
+ {
+ $dispatcher = new EventDispatcher();
+ $kernel = $this->getMockBuilder('Symfony\Component\HttpKernel\HttpKernelInterface')->getMock();
+ $response = new Response('foo ');
+ $listener = new SurrogateListener(new Esi());
+
+ $dispatcher->addListener(KernelEvents::RESPONSE, array($listener, 'onKernelResponse'));
+ $event = new FilterResponseEvent($kernel, new Request(), HttpKernelInterface::MASTER_REQUEST, $response);
+ $dispatcher->dispatch(KernelEvents::RESPONSE, $event);
+
+ $this->assertEquals('content="ESI/1.0"', $event->getResponse()->headers->get('Surrogate-Control'));
+ }
+
+ public function testFilterWhenThereIsNoEsiIncludes()
+ {
+ $dispatcher = new EventDispatcher();
+ $kernel = $this->getMockBuilder('Symfony\Component\HttpKernel\HttpKernelInterface')->getMock();
+ $response = new Response('foo');
+ $listener = new SurrogateListener(new Esi());
+
+ $dispatcher->addListener(KernelEvents::RESPONSE, array($listener, 'onKernelResponse'));
+ $event = new FilterResponseEvent($kernel, new Request(), HttpKernelInterface::MASTER_REQUEST, $response);
+ $dispatcher->dispatch(KernelEvents::RESPONSE, $event);
+
+ $this->assertEquals('', $event->getResponse()->headers->get('Surrogate-Control'));
+ }
+}