public List<SelectorDO> getSelectors() {
        return ((Collection<?>) getSource())
                .stream()
                .map(SelectorDO.class::cast)
                .collect(Collectors.toList());
    }
@Test
    void getSelectors() {
        List<SelectorDO> selectors = batchSelectorDeletedEvent.getSelectors();

        assertNotNull(selectors);
        assertEquals(selectors.size(), selectorDOList.size());
    }