public void registerFilter(AbstractRequestFilter requestFilter) {
        filters.add(requestFilter);
    }
@Test
    void testRegisterFilter() {
        RequestFilters requestFilters = new RequestFilters();
        requestFilters.registerFilter(new AbstractRequestFilter() {
            @Override
            protected Response filter(Request request, RequestMeta meta, Class handlerClazz) throws NacosException {
                return null;
            }
        });
        
        assertEquals(1, requestFilters.filters.size());
    }