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diff --git a/vendor/symfony/http-kernel/Tests/EventListener/TranslatorListenerTest.php b/vendor/symfony/http-kernel/Tests/EventListener/TranslatorListenerTest.php
new file mode 100644
index 000000000..23b833177
--- /dev/null
+++ b/vendor/symfony/http-kernel/Tests/EventListener/TranslatorListenerTest.php
@@ -0,0 +1,118 @@
+<?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\HttpKernel\Tests\EventListener;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Event\FinishRequestEvent;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\HttpKernel\EventListener\TranslatorListener;
+use Symfony\Component\HttpKernel\HttpKernelInterface;
+
+class TranslatorListenerTest extends TestCase
+{
+    private $listener;
+    private $translator;
+    private $requestStack;
+
+    protected function setUp()
+    {
+        $this->translator = $this->getMockBuilder('Symfony\Component\Translation\TranslatorInterface')->getMock();
+        $this->requestStack = $this->getMockBuilder('Symfony\Component\HttpFoundation\RequestStack')->getMock();
+        $this->listener = new TranslatorListener($this->translator, $this->requestStack);
+    }
+
+    public function testLocaleIsSetInOnKernelRequest()
+    {
+        $this->translator
+            ->expects($this->once())
+            ->method('setLocale')
+            ->with($this->equalTo('fr'));
+
+        $event = new GetResponseEvent($this->createHttpKernel(), $this->createRequest('fr'), HttpKernelInterface::MASTER_REQUEST);
+        $this->listener->onKernelRequest($event);
+    }
+
+    public function testDefaultLocaleIsUsedOnExceptionsInOnKernelRequest()
+    {
+        $this->translator
+            ->expects($this->at(0))
+            ->method('setLocale')
+            ->will($this->throwException(new \InvalidArgumentException()));
+        $this->translator
+            ->expects($this->at(1))
+            ->method('setLocale')
+            ->with($this->equalTo('en'));
+
+        $event = new GetResponseEvent($this->createHttpKernel(), $this->createRequest('fr'), HttpKernelInterface::MASTER_REQUEST);
+        $this->listener->onKernelRequest($event);
+    }
+
+    public function testLocaleIsSetInOnKernelFinishRequestWhenParentRequestExists()
+    {
+        $this->translator
+            ->expects($this->once())
+            ->method('setLocale')
+            ->with($this->equalTo('fr'));
+
+        $this->setMasterRequest($this->createRequest('fr'));
+        $event = new FinishRequestEvent($this->createHttpKernel(), $this->createRequest('de'), HttpKernelInterface::SUB_REQUEST);
+        $this->listener->onKernelFinishRequest($event);
+    }
+
+    public function testLocaleIsNotSetInOnKernelFinishRequestWhenParentRequestDoesNotExist()
+    {
+        $this->translator
+            ->expects($this->never())
+            ->method('setLocale');
+
+        $event = new FinishRequestEvent($this->createHttpKernel(), $this->createRequest('de'), HttpKernelInterface::SUB_REQUEST);
+        $this->listener->onKernelFinishRequest($event);
+    }
+
+    public function testDefaultLocaleIsUsedOnExceptionsInOnKernelFinishRequest()
+    {
+        $this->translator
+            ->expects($this->at(0))
+            ->method('setLocale')
+            ->will($this->throwException(new \InvalidArgumentException()));
+        $this->translator
+            ->expects($this->at(1))
+            ->method('setLocale')
+            ->with($this->equalTo('en'));
+
+        $this->setMasterRequest($this->createRequest('fr'));
+        $event = new FinishRequestEvent($this->createHttpKernel(), $this->createRequest('de'), HttpKernelInterface::SUB_REQUEST);
+        $this->listener->onKernelFinishRequest($event);
+    }
+
+    private function createHttpKernel()
+    {
+        return $this->getMockBuilder('Symfony\Component\HttpKernel\HttpKernelInterface')->getMock();
+    }
+
+    private function createRequest($locale)
+    {
+        $request = new Request();
+        $request->setLocale($locale);
+
+        return $request;
+    }
+
+    private function setMasterRequest($request)
+    {
+        $this->requestStack
+            ->expects($this->any())
+            ->method('getParentRequest')
+            ->will($this->returnValue($request));
+    }
+}