@Test
public void testGetOperator() {

    final String expectedOperator = "operator";
    when(plugin.getFactField()).thenReturn("factField");
    when(plugin.editingCol()).thenReturn(editingCol);
    when(editingCol.getOperator()).thenReturn(expectedOperator);
    final String operator = page.getOperator();
    verify(plugin).editingCol();
    verify(editingCol).getOperator();
    assertEquals(expectedOperator,
                 operator);
}