@Test
public void testSetOperator() throws Exception {

    doReturn(editingCol).when(plugin).editingCol();
    plugin.setOperator("operator");
    verify(editingCol).setOperator("operator");
    verify(plugin).fireChangeEvent(operatorPage);
    verify(plugin).fireChangeEvent(additionalInfoPage);
    verify(plugin).fireChangeEvent(valueOptionsPage);
}