php - loading a class from a parent namespace -

i'm working on application in modular way, is, have interface , want make unit test classes implement interface made abstract class have logic implemented(testing if class implementing interface, testing return values , on) when try inherit abstract class class not found exception i'm working namespaces directory structure this

namespacea |->abstract.php |->namespaceb     |->plugintest.php 

so plugintest.php class definition this

namespace namespacea\namespaceb;     use namespacea\abstract;  class plugintest extends abstract 

and in abstract class there namespacea definition, have tried manually include file (include("../abstract.php")) failed, since have used autoloading while maybe don't remember how manually import, have tried alias of class (using namespacea\abstract x) , putting \ before namespacea nothing work, im doing wrong, or im missing

==edit==

i managed load class using

include __dir__ ."/../abstract.php"; 

but still not autoloading

i solved have add test directory module.php this

public function getautoloaderconfig()     {         return array(             'zend\loader\classmapautoloader' => array(                 __dir__ . '/autoload_classmap.php',             ),             'zend\loader\standardautoloader' => array(                 'namespaces' => array(                     __namespace__ => __dir__ . '/src/' . __namespace__,                     'namespacea' => __dir__ . '/test/' .'namespacea', //added line                 ),             ),         );     }