@Override
    protected Mono<Boolean> doMatcher(final ServerWebExchange exchange, final WebFilterChain chain) {
        String path = exchange.getRequest().getURI().getRawPath();
        return Mono.just(paths.contains(path));
    }
@Test
    public void testDoMatcher() {
        ServerWebExchange webExchange =
                MockServerWebExchange.from(MockServerHttpRequest
                        .post("http://localhost:8080/fallback/hystrix"));
        Mono<Boolean> filter = fallbackFilter.doMatcher(webExchange, webFilterChain);
        StepVerifier.create(filter).expectNext(Boolean.TRUE).verifyComplete();
    }