message: API: Use extractSingleMongoId in getSimpleChatRoomSetup
diff: @@ -9,6 +9,7 @@ import {IUser} from '../../shared/models/IUser';
  import {ITaskUnit} from '../../shared/models/units/ITaskUnit';
  import {ITaskUnitModel} from '../src/models/units/TaskUnit';
  import {IChatRoom} from '../../shared/models/IChatRoom';
  +import {extractSingleMongoId} from '../src/utilities/ExtractMongoId';
  import * as mongoose from 'mongoose';
  import ObjectId = mongoose.Types.ObjectId;
  @@ -153,7 +154,7 @@ export class FixtureUtils {
  public static async getSimpleChatRoomSetup(hash?: string) {
  const course = await FixtureUtils.getRandomCourse();
  const room = await FixtureUtils.getRandom<IChatRoom>(course.chatRooms, hash);
  - const roomId: string = room._id.toString();
  + const roomId = extractSingleMongoId(room);
  return {course, roomId};
  }
  