### Question:
DeleteRelationRowCommand 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) { uiModel.deleteRow(uiRowIndex); updateRowNumbers(); updateParentInformation(); canvasOperation.execute(); return CanvasCommandResultBuilder.SUCCESS; } @Override public CommandResult<CanvasViolation> undo(final AbstractCanvasHandler handler) { uiModel.insertRow(uiRowIndex, oldUiModelRow); updateRowNumbers(); updateParentInformation(); canvasOperation.execute(); return CanvasCommandResultBuilder.SUCCESS; } }; } DeleteRelationRowCommand(final Relation relation,
                                    final GridData uiModel,
                                    final int uiRowIndex,
                                    final org.uberfire.mvp.Command canvasOperation); void updateRowNumbers(); void updateParentInformation();  }### Answer:
@Test public void testCanvasCommandAllow() { final Command<AbstractCanvasHandler, CanvasViolation> c = command.newCanvasCommand(handler); assertEquals(CanvasCommandResultBuilder.SUCCESS, c.allow(handler)); }