@Override
            public Integer call() throws Exception {
                return ProviderInfoWeightManager.getWeight(providerInfo);
            }
because of weight degrade/recover is async, this get method will delay n*50ms
@param providerInfo ProviderInfo
@param expect expect weight
@param n50ms N * 50ms
@return weight
fault/fault-tolerance/src/test/java/com/alipay/sofa/rpc/client/aft/FaultBaseTest.java