Merge branch 'bugfix/login-missing-uuid' into develop

@@ -77,14 +77,17 @@ export class Connection {
   private handleLogin(
     message: ServerInboundMessage<"login">
   ): ServerResponse<"login"> {
-    if (message.nickname.length > 12 || message.nickname.trim().length === 0) {
-      return { ok: false };
+    if (message.nickname.length > 12) {
+      return { ok: false, reason: "닉네임은 최대 12글자입니다." };
+    }
+    if (message.nickname.trim().length === 0) {
+      return { ok: false, reason: "닉네임을 공백으로 설정할 수 없습니다." };
     }
 
     this.user = new User(message.nickname, this);
     // console.log(`User ${message.username} has logged in!`);
 
-    return { ok: true };
+    return { ok: true, result: this.user.username };
   }
 
   public handleDisconnect(): void {

@@ -6,7 +6,8 @@ describe("로그인", () => {
   it("닉네임으로 로그인합니다", () => {
     const roomManager = new RoomManager();
     const socket = new SocketTester(roomManager);
-    socket.testOk("login", { nickname: "guest" });
+    const response = socket.test("login", { nickname: "guest" });
+    expect(response.result !== undefined).eq(true);
     expect(socket.connection.user?.nickname).eq("guest");
   });
   it("빈 닉네임으로 로그인할 수 없습니다", () => {