message: API: Refactor FixtureUtils.getSimpleChatRoomSetup
diff: @@ -151,9 +151,9 @@ export class FixtureUtils {
  }
  public static async getSimpleChatRoomSetup(hash?: string) {
  - const course = await FixtureUtils.getRandomCourse() as ICourseModel;
  + const course = await FixtureUtils.getRandomCourse();
  const room = await FixtureUtils.getRandom<IChatRoom>(course.chatRooms, hash);
  - const roomId = room._id.toString();
  + const roomId: string = room._id.toString();
  return {course, roomId};
  }
  