FunctionalFactoryWithBuilder.cs

private readonly Func<InternalMediaItemDto> _internalMediaItemDtoFactory = () => Builder<InternalMediaItemDto>
            .CreateNew()
            .With(x => x.MediaItem = Builder<MediaItem>.CreateNew().Build())
            .Build();

private readonly Func<int, IEnumerable<BundleOffer>> _bundleOffersFactory = x => Builder<BundleOffer>
            .CreateListOfSize(x)
            .Build();