/**
  * test load config
  */
 public function testSaveConfig()
 {
     $configData = $this->_json->loadConfig();
     // add something to config
     $configData['test'] = 'value';
     $this->_json->saveConfig($configData);
     // load
     $result = $this->_json->loadConfig();
     // check
     $this->assertTrue(isset($result['test']));
     $this->assertEquals('value', $result['test']);
     $this->assertEquals($configData['database'], $result['database']);
 }