### Question:
RelationGridCell extends BaseHasDynamicHeightCell<T> { @Override public Optional<Editor> getEditor() { return Optional.of(listSelector); } RelationGridCell(final GridCellValue<T> value,
                            final ListSelectorView.Presenter listSelector,
                            final double lineHeight); @Override Optional<Editor> getEditor();  }### Answer:
@Test @SuppressWarnings("unchecked") public void testGetEditor() { assertThat(cell.getEditor()).isNotEmpty(); assertThat(cell.getEditor().get()).isSameAs(listSelector); }