/**
  * Tests DbDataSourceDescriptor->listGenerator()
  */
 public function testListGenerator()
 {
     $this->assertInstanceOf('\\Generator', $this->DbDataSourceDescriptor->listGenerator(), 'returning generator instance');
     foreach ($this->DbDataSourceDescriptor->listGenerator() as $key => $value) {
         $this->assertInternalType('string', $key, 'dataset name');
         $this->assertInstanceOf('\\VisioCrudModeler\\Descriptor\\Db\\DbDataSetDescriptor', $value, ' implementation of db dataset descriptor');
         $this->assertInstanceOf('\\VisioCrudModeler\\Descriptor\\DataSetDescriptorInterface', $value, ' implementation of dataset descriptor interface');
     }
 }