@Override
    public ServerLocation findBestServer(ServerLocation currentServer, Set excludedServers) {
      finds.incrementAndGet();
      if (excludedServers != null) {
        if (excludedServers.contains(nextServer.get())) {
          return null;
        }
      }
      return nextServer.get();
    }
This tests that a deadlock between connection formation and connection pool closing has been
fixed. See GEODE-4615
geode-core/src/integrationTest/java/org/apache/geode/cache/client/internal/pooling/ConnectionManagerJUnitTest.java