### Question:
AttributeColumnConfigRowView extends HorizontalPanel { public CheckBox addUseRowNumberCheckBox(AttributeCol52 attributeColumn, boolean isEditable, ClickHandler clickHandler) { final CheckBox chkUseRowNumber = new CheckBox(GuidedDecisionTableConstants.INSTANCE.UseRowNumber()); chkUseRowNumber.setValue(attributeColumn.isUseRowNumber()); chkUseRowNumber.setEnabled(isEditable); chkUseRowNumber.addClickHandler(clickHandler); add(chkUseRowNumber); return chkUseRowNumber; } AttributeColumnConfigRowView(); @Inject  AttributeColumnConfigRowView(final DeleteColumnManagementAnchorWidget deleteColumnManagementAnchorWidget); void addRemoveAttributeButton(final Command clickHandler,
                                         final boolean isEditable); void addColumnLabel(AttributeCol52 attributeColumn); void addDefaultValue(AttributeCol52 attributeColumn,
                                boolean isEditable,
                                DefaultValueWidgetFactory.DefaultValueChangedEventHandler handler); CheckBox addUseRowNumberCheckBox(AttributeCol52 attributeColumn,
                                            boolean isEditable,
                                            ClickHandler clickHandler); CheckBox addReverseOrderCheckBox(AttributeCol52 attributeColumn,
                                            boolean isEditable,
                                            ClickHandler clickHandler); CheckBox addHideColumnCheckBox(AttributeCol52 attributeColumn,
                                          ClickHandler clickHandler);  }### Answer:
@Test public void testAddUseRowNumberCheckBox() throws Exception { view.addUseRowNumberCheckBox(attributeColumn, true, null); verify(view).add(widgetCaptor.capture()); assertTrue(widgetCaptor.getValue() instanceof CheckBox); }