text: 
  package com.networknt.apib.handler;
  
  import com.networknt.server.Server;
  import org.junit.rules.ExternalResource;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import com.networknt.server.Server;
  import com.networknt.server.ServerConfig;
  
  public class TestServer extends ExternalResource {
      static final Logger logger = LoggerFactory.getLogger(TestServer.class);
  
      private static final AtomicInteger refCount = new AtomicInteger(0);
      private static Server server;
  
      private static final TestServer instance  = new TestServer();
  
      public static TestServer getInstance () {
          return instance;
      }
  
      private TestServer() {
  
      }
  
      public ServerConfig getServerConfig() {
          return Server.config;
      }
  
      @Override
      protected void before() {
          try {
              if (refCount.get() == 0) {
                  Server.start();
              }
          }
          finally {
              refCount.getAndIncrement();
          }
      }
  
      @Override
      protected void after() {
          refCount.getAndDecrement();
          if (refCount.get() == 0) {
              Server.stop();
          }
      }
  }
  