public function testAddGetCorrectItems()
 {
     $columnSettings = $this->configurationBuilderMock->getSettingsForConfigObject('columns');
     $columnConfigCollection = new Tx_PtExtlist_Domain_Configuration_Columns_ColumnConfigCollection();
     $columnConfigCollection->addColumnConfig(10, new Tx_PtExtlist_Domain_Configuration_Columns_ColumnConfig($this->configurationBuilderMock, $columnSettings[10]));
     $columnConfigCollection->addColumnConfig(20, new Tx_PtExtlist_Domain_Configuration_Columns_ColumnConfig($this->configurationBuilderMock, $columnSettings[20]));
     $columnConfig10 = $columnConfigCollection->getColumnConfigById(10);
     $this->assertEquals($columnConfig10->getColumnIdentifier(), 'column1');
     $columnConfig20 = $columnConfigCollection->getColumnConfigById(20);
     $this->assertEquals($columnConfig20->getColumnIdentifier(), 'column2');
 }