public void DeleteOffersWithoutProductTests()
        {
            // Arrange
            var offerService = new OfferService();
            var offers       = new List <Offer>();

            offers.Add(new Offer()
            {
                ProductIeId = 1
            });
            offers.Add(new Offer()
            {
                ProductIeId = 2
            });
            offers.Add(new Offer()
            {
                ProductIeId = 3
            });
            offers.Add(new Offer()
            {
                ProductIeId = 4
            });

            var ids = new List <Product>()
            {
                new Product()
                {
                    ProductExId = 1, ProductIeId = 11
                },
                new Product()
                {
                    ProductExId = 2, ProductIeId = 12
                }
            };

            // Act
            offerService.DeleteOffersWithoutProduct(offers, ids);

            // Assert
            Assert.AreEqual(offers.Count, 2);
        }