public void ShouldSaveProductCategory() { var supplierId = Guid.NewGuid(); var model = new ProductCategoryRequestModel() { SupplierId = supplierId, CategoryName = "celular" }; _supplierService.ExistsById(supplierId).Returns(true); _productService.Create(model); _productRepository.Received(1) .Create(Arg.Is <ProductCategory>(x => x.CategoryName.ToString() == "celular" && x.SupplierId == supplierId)); }