chat이 유저의 닉네임을 보내도록 변경

@@ -215,7 +215,7 @@ export class Room {
   }
   }
 
 
   public sendChat(user: User, message: string): void {
   public sendChat(user: User, message: string): void {
-    this.broadcast("chat", { sender: user.username, message: message });
+    this.broadcast("chat", { sender: user.nickname, message: message });
   }
   }
 
 
   private updateUserStatus(user: User) {
   private updateUserStatus(user: User) {

@@ -27,7 +27,7 @@ describe("채팅", () => {
     } = prepareJoinedRoom(1);
     } = prepareJoinedRoom(1);
     socket.testOk("chat", { message: "Hello World" });
     socket.testOk("chat", { message: "Hello World" });
   });
   });
-  it("자신을 제외한 다른 사람들이 채팅을 받습니다", () => {
+  it("모두가 채팅을 받습니다", () => {
     const {
     const {
       sockets: [socket1, socket2],
       sockets: [socket1, socket2],
       users: [user1, user2],
       users: [user1, user2],
@@ -35,9 +35,13 @@ describe("채팅", () => {
 
 
     socket1.testOk("chat", { message: "Hello World" });
     socket1.testOk("chat", { message: "Hello World" });
 
 
+    expect(socket1.socket.received("chat")).deep.eq({
+      message: "Hello World",
+      sender: user1.nickname,
+    });
     expect(socket2.socket.received("chat")).deep.eq({
     expect(socket2.socket.received("chat")).deep.eq({
       message: "Hello World",
       message: "Hello World",
-      sender: user1.username,
+      sender: user1.nickname,
     });
     });
   });
   });
   it("빈 채팅은 보낼 수 없습니다", () => {
   it("빈 채팅은 보낼 수 없습니다", () => {