added an exception when the authentication type is not registered

src/Silex/Provider/SecurityServiceProvider.php

@@ -163,11 +163,13 @@ class SecurityServiceProvider implements ServiceProviderInterface
                             $options = array();
                         }
 
-                        if (isset($app['security.authentication.factory.'.$type])) {
-                            list($listener, $entryPoint) = $app['security.authentication.factory.'.$type]($name, $options);
-
-                            $listeners[] = $listener;
+                        if (!isset($app['security.authentication.factory.'.$type])) {
+                            throw new \LogicException(sprintf('The "%s" authentication entry is not registered.', $type));
                         }
+
+                        list($listener, $entryPoint) = $app['security.authentication.factory.'.$type]($name, $options);
+
+                        $listeners[] = $listener;
                     }
 
                     $listeners[] = $app['security.access_listener'];

tests/Silex/Tests/Provider/SecurityServiceProviderTest.php

@@ -32,6 +32,24 @@ class SecurityServiceProviderTest extends WebTestCase
         }
     }
 
+    /**
+     * @expectedException \LogicException
+     */
+    public function testWrongAuthenticationType()
+    {
+        $app = new Application();
+        $app->register(new SecurityServiceProvider(), array(
+            'security.firewalls' => array(
+                'wrong' => array(
+                    'foobar' => true,
+                    'users' => array(),
+                ),
+            ),
+        ));
+        $app->get('/', function () {});
+        $app->handle(Request::create('/'));
+    }
+
     public function testFormAuthentication()
     {
         $app = $this->createApplication('form');