Server 클래스 작성

+import express from "express";
+import socketIo, { Server as IoServer } from "socket.io";
+import { createServer } from "http";
+import { SocketHandler } from "./SocketHandler";
+import { RoomManager } from "./room/RoomManager";
+
+export class Server {
+  public readonly port: number;
+  private readonly io: IoServer;
+
+  constructor(port: number) {
+    this.port = port;
+
+    const app = express();
+    const server = createServer(app);
+    this.io = new socketIo.Server(server);
+
+    const handler = new SocketHandler();
+    const roomManager = new RoomManager();
+
+    roomManager.create("테스트 방 #1", 8);
+    roomManager.create("테스트 방 #2", 4);
+    roomManager.create("테스트 방 #3", 2);
+
+    this.io.on("connection", (socket) => {
+      handler.connected(socket);
+    });
+
+    server.listen(port, () => console.log(`Listening on ${port}`));
+  }
+
+  public close(): void {
+    this.io.close();
+  }
+}

-import express from "express";
-import socketIo from "socket.io";
-import { createServer } from "http";
-import { SocketHandler } from "./SocketHandler";
-import { RoomManager } from "./room/RoomManager";
+import { Server } from "./Server";
 
-const PORT = 3000;
-
-const app = express();
-const server = createServer(app);
-const io = new socketIo.Server(server);
-
-const handler = new SocketHandler();
-const roomManager = new RoomManager();
-
-roomManager.create("테스트 방 #1", 8);
-roomManager.create("테스트 방 #2", 4);
-roomManager.create("테스트 방 #3", 2);
-
-io.on("connection", (socket) => {
-  handler.connected(socket);
-});
-
-server.listen(PORT, () => console.log(`Listening on ${PORT}`));
+new Server(3000);