public void Delete_IdExisting_ReturnsDeletedProductSizeWithSpecifiedId()
        {
            //Arrange
            int         existingId = 12;
            ProductSize expected   = new ProductSize
            {
                Id            = existingId,
                ProductMetric = new ProductMetric {
                    Id = 1
                },
                Size         = "XL",
                MetricXValue = 70,
                MetricYValue = -13,
                MetricZValue = 20
            };

            Mock <IProductSizeRepository> productSizeRepository = new Mock <IProductSizeRepository>();

            productSizeRepository.Setup(repo => repo.Delete(existingId)).
            Returns(expected);
            Mock <IProductMetricRepository> productMetricRepository = new Mock <IProductMetricRepository>();

            IProductSizeService productSizeService = new ProductSizeService(productSizeRepository.Object,
                                                                            productMetricRepository.Object);

            //Act
            ProductSize actual = productSizeService.Delete(existingId);

            //Assert
            Assert.Equal(expected, actual);
        }
        public void Delete_IdNonExisting_ReturnsNull()
        {
            //Arrange
            int         existingId = 12;
            ProductSize expected   = null;

            Mock <IProductSizeRepository> productSizeRepository = new Mock <IProductSizeRepository>();

            productSizeRepository.Setup(repo => repo.Delete(existingId)).
            Returns(expected);
            Mock <IProductMetricRepository> productMetricRepository = new Mock <IProductMetricRepository>();

            IProductSizeService productSizeService = new ProductSizeService(productSizeRepository.Object,
                                                                            productMetricRepository.Object);

            //Act
            ProductSize actual = productSizeService.Delete(existingId);

            //Assert
            Assert.Equal(expected, actual);
        }