references.add(reference);
      return myServer;
    }

    @Override
    public void close() throws IOException {
      serverSocket.close();
    }
  }

  private ServerSocket makeMyServerExampleWithFrq(AtomicBoolean finalizeReferentRan)
      throws IOException {
    MyServerExampleWithFrq myServer = MyServerExampleWithFrq.create(finalizeReferentRan);
    assertThat(myServer.serverSocket.isClosed()).isFalse();