### Question:
EditablePopupHeaderMetaData implements EditableHeaderMetaData { @Override public void setColumnGroup(final String columnGroup) { throw new UnsupportedOperationException("Group cannot be set."); } EditablePopupHeaderMetaData(final CellEditorControlsView.Presenter cellEditorControls,
                                       final E editor); @Override void setColumnGroup(final String columnGroup); @Override void setTitle(final String title); @Override void edit(final GridBodyCellEditContext context); @Override void destroyResources();  }### Answer:
@Test(expected = UnsupportedOperationException.class) public void testSetColumnGroup() { header.setColumnGroup("group"); }