[tests] fix for base ODM test case to test connection

tests/Gedmo/Tool/BaseTestCaseMongoODM.php

@@ -70,6 +70,7 @@ abstract class BaseTestCaseMongoODM extends \PHPUnit_Framework_TestCase
 
         try {
             $this->dm = DocumentManager::create($conn, $config, $evm ?: $this->getEventManager());
+            $this->dm->getConnection()->connect();
         } catch (\MongoException $e) {
             $this->markTestSkipped('Doctrine MongoDB ODM failed to connect');
         }
@@ -161,4 +162,4 @@ abstract class BaseTestCaseMongoODM extends \PHPUnit_Framework_TestCase
 
         return $config;
     }
-}
+}