게임 도중 입장하지 못하도록 수정

@@ -102,7 +102,11 @@ export class Room {
   }
 
   public connect(user: User): void {
-    if (this.users.includes(user) || this.users.length >= this.maxUsers) {
+    if (
+      this.users.includes(user) ||
+      this.users.length >= this.maxUsers ||
+      this.game
+    ) {
       return;
     }
 

@@ -16,6 +16,8 @@ export class DummySocket implements SocketWrapper {
 
   public setDisconnectHandler(handler: () => void) {}
 
+  public setPingHandler(handler: () => void) {}
+
   public send(raw: RawMessage): void {
     this.receivedMessages.push(raw);
   }
@@ -43,4 +45,8 @@ export class DummySocket implements SocketWrapper {
   public notReceived<T extends ServerOutboundMessageKey>(key: T): void {
     expect(this.findMessageIndex(key) === -1).eq(true);
   }
+
+  public sendPing(): void {
+    // TODO
+  }
 }