static long delayGetCount(final InvocationStat invocationStat, long expect) {
        return delayGet(new Callable<Long>() {
            @Override
            public Long call() throws Exception {
                return invocationStat.getInvokeCount();
            }
        }, expect, 10, 10);
    }
because of subscriber is async, this get method will delay 100ms
@param invocationStat InvocationStat
@param expect expect count
@return count
fault/fault-tolerance/src/test/java/com/alipay/sofa/rpc/client/aft/FaultBaseTest.java