message: Add test for PoolWorker.connect_to_known_nodes.
diff: @@ -531,6 +531,19 @@ mod tests {
  assert_eq!(pw.merkle_tree.root_hash_hex(), "1285070cf01debc1155cef8dfd5ba54c05abb919a4c08c8632b079fb1e1e5e7c", "test restored MT root hash");
  }
  + #[test]
  + fn pool_service_pool_worker_test_connect() {
  + let mut pw: PoolWorker = Default::default();
  + let (gt, handle) = nodes_emulator::start();
  + pw.merkle_tree.append(serde_json::to_string(&gt).unwrap());
  +
  + pw.connect_to_known_nodes();
  +
  + let emulator_msgs: Vec<String> = handle.join().unwrap();
  + assert_eq!(1, emulator_msgs.len());
  + assert_eq!("pi", emulator_msgs[0]);
  + }
  +
  #[test]
  fn pool_service_remote_node_can_connect_and_ping_pong() {
  let (gt, handle) = nodes_emulator::start();
  