fixed before handlers not executed under mounts

doc/changelog.rst

 Changelog
 =========
 
-2.2.2 (2017-XX-XX)
+2.2.2 (2018-01-12)
 ------------------
 
-* n/a
+* [SECURITY] fixed before handlers not executed under mounts
 
 2.2.1 (2017-12-14)
 ------------------

src/Silex/ControllerCollection.php

@@ -68,6 +68,7 @@ class ControllerCollection
     {
         if (is_callable($controllers)) {
             $collection = $this->controllersFactory ? call_user_func($this->controllersFactory) : new static(new Route(), new RouteCollection());
+            $collection->defaultRoute = clone $this->defaultRoute;
             call_user_func($controllers, $collection);
             $controllers = $collection;
         } elseif (!$controllers instanceof self) {

tests/Silex/Tests/ControllerCollectionTest.php

@@ -191,6 +191,23 @@ class ControllerCollectionTest extends TestCase
         $this->assertEquals('\w+', $controller->getRoute()->getRequirement('extra'));
     }
 
+    public function testAssertWithMountCallable()
+    {
+        $controllers = new ControllerCollection(new Route());
+        $controller = null;
+        $controllers->mount('/{name}', function ($mounted) use (&$controller) {
+            $mounted->assert('name', '\w+');
+            $mounted->mount('/{id}', function ($mounted2) use (&$controller) {
+                $mounted2->assert('id', '\d+');
+                $controller = $mounted2->match('/{extra}', function () {})->assert('extra', '\w+');
+            });
+        });
+
+        $this->assertEquals('\d+', $controller->getRoute()->getRequirement('id'));
+        $this->assertEquals('\w+', $controller->getRoute()->getRequirement('name'));
+        $this->assertEquals('\w+', $controller->getRoute()->getRequirement('extra'));
+    }
+
     public function testValue()
     {
         $controllers = new ControllerCollection(new Route());