Ensure language is valid

- Do not override locale if user has choosen a locale from the login screen.
- Add some tests about locale url

tests/Wallabag/CoreBundle/Controller/ConfigControllerTest.php

@@ -965,4 +965,39 @@ class ConfigControllerTest extends WallabagCoreTestCase
 
         $client->request('GET', '/config/view-mode');
     }
+
+    public function testChangeLocaleWithoutReferer()
+    {
+        $client = $this->getClient();
+
+        $client->request('GET', '/locale/de');
+        $client->followRedirect();
+
+        $this->assertSame('de', $client->getRequest()->getLocale());
+        $this->assertSame('de', $client->getContainer()->get('session')->get('_locale'));
+    }
+
+    public function testChangeLocaleWithReferer()
+    {
+        $client = $this->getClient();
+
+        $client->request('GET', '/login');
+        $client->request('GET', '/locale/de');
+        $client->followRedirect();
+
+        $this->assertSame('de', $client->getRequest()->getLocale());
+        $this->assertSame('de', $client->getContainer()->get('session')->get('_locale'));
+    }
+
+    public function testChangeLocaleToBadLocale()
+    {
+        $client = $this->getClient();
+
+        $client->request('GET', '/login');
+        $client->request('GET', '/locale/yuyuyuyu');
+        $client->followRedirect();
+
+        $this->assertNotSame('yuyuyuyu', $client->getRequest()->getLocale());
+        $this->assertNotSame('yuyuyuyu', $client->getContainer()->get('session')->get('_locale'));
+    }
 }

tests/Wallabag/CoreBundle/Event/Listener/UserLocaleListenerTest.php

@@ -56,4 +56,27 @@ class UserLocaleListenerTest extends TestCase
 
         $this->assertNull($session->get('_locale'));
     }
+
+    public function testWithLanguageFromSession()
+    {
+        $session = new Session(new MockArraySessionStorage());
+        $listener = new UserLocaleListener($session);
+        $session->set('_locale', 'de');
+
+        $user = new User();
+        $user->setEnabled(true);
+
+        $config = new Config($user);
+        $config->setLanguage('fr');
+
+        $user->setConfig($config);
+
+        $userToken = new UsernamePasswordToken($user, '', 'test');
+        $request = Request::create('/');
+        $event = new InteractiveLoginEvent($request, $userToken);
+
+        $listener->onInteractiveLogin($event);
+
+        $this->assertSame('de', $session->get('_locale'));
+    }
 }

tests/Wallabag/UserBundle/EventListener/CreateConfigListenerTest.php

@@ -8,6 +8,8 @@ use PHPUnit\Framework\TestCase;
 use Symfony\Component\EventDispatcher\EventDispatcher;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpFoundation\Session\Session;
+use Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage;
 use Wallabag\CoreBundle\Entity\Config;
 use Wallabag\UserBundle\Entity\User;
 use Wallabag\UserBundle\EventListener\CreateConfigListener;
@@ -22,6 +24,7 @@ class CreateConfigListenerTest extends TestCase
 
     protected function setUp()
     {
+        $session = new Session(new MockArraySessionStorage());
         $this->em = $this->getMockBuilder('Doctrine\ORM\EntityManager')
             ->disableOriginalConstructor()
             ->getMock();
@@ -34,7 +37,8 @@ class CreateConfigListenerTest extends TestCase
             'fr',
             1,
             1,
-            1
+            1,
+            $session
         );
 
         $this->dispatcher = new EventDispatcher();