fix test

collection expects:
 - to have an object (array/traversable) and hydrator, or
 - that its target element have an object (allows binding) and hydrator

to be able to extract the values from the object bound to it

previously the collection was being assigned a hydrator. with that gone,
we now have to assign an object and a hydrator to its target element.

tests/ZendTest/Form/Element/CollectionTest.php

@@ -509,7 +509,8 @@ public function testCanBindObjectAndPopulateAndExtractNestedFieldsets()
         $productFieldset->setHydrator(new \Zend\Stdlib\Hydrator\ClassMethods());
 
         $mainFieldset = new Fieldset('shop');
-        $mainFieldset->setHydrator(new \Zend\Stdlib\Hydrator\ClassMethods());
+        $mainFieldset->setObject(new stdClass);
+        $mainFieldset->setHydrator(new ObjectPropertyHydrator());
         $mainFieldset->add($productFieldset);
 
         $form = new Form();