public function testGetLang()
 {
     $valueLang = 'test-value_lang';
     $serviceLocator = $this->getServiceManager();
     $value = $this->getMock('Omeka\\Entity\\Value');
     $value->expects($this->once())->method('getLang')->will($this->returnValue($valueLang));
     $valueRep = new ValueRepresentation($value, $serviceLocator);
     $this->assertEquals($valueLang, $valueRep->lang());
 }