Mapper.CreateMap<HouseDomain, HouseDto>().ForMember(dto => dto.DtoRooms, opt => opt.MapFrom(src => src.DomainRooms));

    Mapper.CreateMap<RoomDomain, RoomDto>();

    Mapper.AssertConfigurationIsValid();

    var house1 = new HouseDomain { DomainRooms = new List<RoomDomain> { new RoomDomain() } };
    var house2 = Mapper.Map<HouseDto>(house1);
    Debug.Assert(house1.DomainRooms.Count() == house2.DtoRooms.Count());