public function testChooseDefault()
 {
     $manager1 = new ezcPersistentCodeManager(dirname(__FILE__) . "/data/");
     $session1 = new ezcPersistentSession(ezcDbInstance::get(), $manager1);
     $manager2 = clone $manager1;
     $session2 = new ezcPersistentSession(ezcDbInstance::get(), $manager2);
     ezcPersistentSessionInstance::set($session1);
     ezcPersistentSessionInstance::set($session2, 'secondary');
     ezcPersistentSessionInstance::chooseDefault('secondary');
     $this->assertSame($manager2, ezcPersistentSessionInstance::get()->definitionManager);
 }