### Question:
DataHandler extends AbstractXulEventHandler { public void onClusterCheck() { if ( clusteringCheck != null ) { boolean dis = !clusteringCheck.isChecked(); if ( clusterParameterTree != null ) { clusterParameterTree.setDisabled( dis ); } if ( clusterParameterDescriptionLabel != null ) { clusterParameterDescriptionLabel.setDisabled( dis ); } } } DataHandler(); void loadConnectionData(); void loadAccessData(); void editOptions( int index ); void clearOptionsData(); void getOptionHelp(); void setDeckChildIndex(); void onPoolingCheck(); void onClusterCheck(); Object getData(); void setData( Object data ); void pushCache(); void popCache(); void onCancel(); void onOK(); void testDatabaseConnection(); void restoreDefaults(); void poolingRowChange( int idx ); void disablePortIfInstancePopulated(); void handleUseSecurityCheckbox(); static final SortedMap<String, DatabaseInterface> connectionMap; static final Map<String, String> connectionNametoID; }### Answer:
@Test public void testOnClusterCheck() throws Exception { }