I mocked in and emit to test this.io.in(room).emit(eventName, result); using jest

this.io.in(room).emit(eventName, result);

this.io.in(room) is working well but I am not sure how to deal with .emit(eventName, result);

here is code

export interface ServerToClientEvents {
 
  [EVENTNAME]: (payload: payload[]) => void;
}

import {   BroadcastOperator, Server } from "socket.io";
import { ServerToClientEvents } from "../../common/Interfaces";

export class MockIo extends Server {
  hasEmitted = false;
  hasEmittedData: string[] = [];
  hasEmittedEventName: string | symbol = "";
  room: string | string[];

  constructor() {
    super();
  }

  emit(event: string | symbol, ...args: any[]): boolean {
    this.hasEmitted = true;
    this.hasEmittedData = args;
    this.hasEmittedEventName = event;
    return true;
  }
 
   in(room: string | string[]): BroadcastOperator<ServerToClientEvents,any> {
     this.room = room;

      return this.emit.bind(this) ;
   }
  
}