### Question:
ContextGrid extends BaseExpressionGrid<Context, ContextGridData, ContextUIModelMapper> implements HasRowDragRestrictions,
                                                                                                               HasListSelectorControl { @SuppressWarnings("unused") List<ListSelectorItem> getHeaderItems(final int uiHeaderRowIndex, final int uiHeaderColumnIndex) { final List<ListSelectorItem> items = new ArrayList<>(); items.add(ListSelectorHeaderItem.build(translationService.format(DMNEditorConstants.ContextEditor_Header))); items.add(ListSelectorTextItem.build(translationService.format(DMNEditorConstants.ContextEditor_InsertContextEntry), true, () -> { cellEditorControls.hide(); getExpression().get().ifPresent(e -> addContextEntry(model.getRowCount() - 1)); })); return items; } ContextGrid(final GridCellTuple parent,
                       final Optional<String> nodeUUID,
                       final HasExpression hasExpression,
                       final Optional<HasName> hasName,
                       final DMNGridPanel gridPanel,
                       final DMNGridLayer gridLayer,
                       final ContextGridData gridData,
                       final DefinitionUtils definitionUtils,
                       final SessionManager sessionManager,
                       final SessionCommandManager<AbstractCanvasHandler> sessionCommandManager,
                       final DefaultCanvasCommandFactory canvasCommandFactory,
                       final Event<ExpressionEditorChanged> editorSelectedEvent,
                       final Event<RefreshFormPropertiesEvent> refreshFormPropertiesEvent,
                       final Event<DomainObjectSelectionEvent> domainObjectSelectionEvent,
                       final CellEditorControlsView.Presenter cellEditorControls,
                       final ListSelectorView.Presenter listSelector,
                       final TranslationService translationService,
                       final boolean isOnlyVisualChangeAllowed,
                       final int nesting,
                       final Supplier<ExpressionEditorDefinitions> expressionEditorDefinitionsSupplier,
                       final ValueAndDataTypePopoverView.Presenter headerEditor,
                       final ReadOnlyProvider readOnlyProvider); @Override ContextUIModelMapper makeUiModelMapper(); @Override void initialiseUiColumns(); @Override void initialiseUiRows(); @Override void initialiseUiCells(); @Override boolean isRowDragPermitted(final GridWidgetDnDHandlersState state); @Override @SuppressWarnings("unused") List<ListSelectorItem> getItems(final int uiRowIndex,
                                           final int uiColumnIndex); @Override void onItemSelected(final ListSelectorItem item); @Override void doAfterSelectionChange(final int uiRowIndex,
                                       final int uiColumnIndex); @Override void doAfterHeaderSelectionChange(final int uiHeaderRowIndex,
                                             final int uiHeaderColumnIndex);  }### Answer:
@Test public void testGetHeaderItemsRowNumberColumn() { setupGrid(0); assertDefaultHeaderListItems(grid.getHeaderItems(0, 0)); }
@Test public void testGetHeaderItemsNameColumn() { setupGrid(0); assertDefaultHeaderListItems(grid.getHeaderItems(0, 1)); }
@Test public void testGetHeaderItemsExpressionColumn() { setupGrid(0); assertDefaultHeaderListItems(grid.getHeaderItems(0, 2)); }