class ColumnTypeEditor implements IsWidget,
                                         org.dashbuilder.dataset.client.editor.ColumnTypeEditor {

    @Override
    public DropDownImageListEditor<ColumnType> columnType() {
        return columnType;
    }

}

class ColumnTypeEditorTest {

    @Mock DropDownImageListEditor<ColumnType> columnType;
    @Mock Widget columnTypeWidget;
    private ColumnTypeEditor presenter;

    @Test
    public void testColumnType() {

        assertEquals(columnType, presenter.columnType());
    }

}