@Override
            public void addProvider(ProviderGroup providerGroup) {
                ps.addAndGet(providerGroup.size());
            }
Created by zhanggeng on 2017/7/15.

@author <a href="mailto:zhanggeng.zg@antfin.com">zhanggeng</a>
registry/registry-sofa/src/test/java/com/alipay/sofa/rpc/registry/sofa/SofaRegistrySubscribeCallbackTest.java