### Question:
DeleteInputClauseCommand extends AbstractCanvasGraphCommand implements VetoExecutionCommand,
                                                                                    VetoUndoCommand { @Override protected Command<AbstractCanvasHandler, CanvasViolation> newCanvasCommand(final AbstractCanvasHandler handler) { return new AbstractCanvasCommand() { @Override public CommandResult<CanvasViolation> execute(final AbstractCanvasHandler handler) { final GridColumn<?> gridColumn = uiModel.getColumns().get(uiColumnIndex); uiModel.deleteColumn(gridColumn); updateParentInformation(); executeCanvasOperation.execute(); return CanvasCommandResultBuilder.SUCCESS; } @Override public CommandResult<CanvasViolation> undo(final AbstractCanvasHandler handler) { uiModel.insertColumn(uiColumnIndex, oldUiModelColumn); for (int rowIndex = 0; rowIndex < dtable.getRule().size(); rowIndex++) { uiModelMapper.fromDMNModel(rowIndex, uiColumnIndex); } updateParentInformation(); undoCanvasOperation.execute(); return CanvasCommandResultBuilder.SUCCESS; } }; } DeleteInputClauseCommand(final DecisionTable dtable,
                                    final GridData uiModel,
                                    final int uiColumnIndex,
                                    final DecisionTableUIModelMapper uiModelMapper,
                                    final org.uberfire.mvp.Command executeCanvasOperation,
                                    final org.uberfire.mvp.Command undoCanvasOperation); void updateParentInformation();  }### Answer:
@Test public void testCanvasCommandAllow() throws Exception { final Command<AbstractCanvasHandler, CanvasViolation> canvasCommand = command.newCanvasCommand(canvasHandler); assertEquals(CanvasCommandResultBuilder.SUCCESS, canvasCommand.allow(canvasHandler)); }