public ProductAggregator(IProductDtoBuilder productDtoBuilder,
                          IReadOnlyRepository <Lawnmower> lawnmowerRepository,
                          IReadOnlyRepository <PhoneCase> phoneCaseRepository,
                          IReadOnlyRepository <TShirt> tShirtRepository)
 {
     _productDtoBuilder   = productDtoBuilder;
     _lawnmowerRepository = lawnmowerRepository;
     _phoneCaseRepository = phoneCaseRepository;
     _tShirtRepository    = tShirtRepository;
 }
 public void Setup()
 {
     _priceCalculator = new Mock <IPriceCalculator>();
     _builder         = new ProductDtoBuilder(_priceCalculator.Object);
 }