public async void DeleteTest()
        {
            // Arrange
            var mockLogManager      = new Mock <ILogManager>();
            var mockSalesValidator  = new Mock <ISalesValidator>();
            var mockSalesRepository = new Mock <ISalesRepository>();
            var mockFileUploader    = new Mock <IFileUploadApplicationService>();
            var mockSales           = new Mock <ISales>();

            // Setup mock methods/properties
            mockSales.Setup(c => c.Id).Returns(It.IsAny <int>());
            mockSalesRepository.Setup(x => x.DeleteAsync(It.IsAny <int>()))
            .Returns(Task.FromResult(new DeleteResponse {
                Message = "Successful."
            }));

            // Act
            var sut = new SalesApplicationService(
                mockLogManager.Object, mockSalesRepository.Object, mockSalesValidator.Object, mockFileUploader.Object);
            var response = await sut.DeleteAsync(It.IsAny <int>());

            // Assert
            response.IsSuccessful.Should().BeTrue();
            response.Errors.Count.Should().Be(0);
            response.Message.Should().NotBeNullOrEmpty();

            // Verify the application service is calling the correct repository method.
            mockSalesRepository.Verify(x => x.DeleteAsync(It.IsAny <int>()));
        }
        public async void DeleteErrorTest()
        {
            // Arrange
            var mockLogManager      = new Mock <ILogManager>();
            var mockSalesValidator  = new Mock <ISalesValidator>();
            var mockSalesRepository = new Mock <ISalesRepository>();
            var mockFileUploader    = new Mock <IFileUploadApplicationService>();
            var mockSales           = new Mock <ISales>();

            // Setup mock methods/properties
            mockSales.Setup(c => c.Id).Returns(It.IsAny <int>());
            mockSalesRepository.Setup(x => x.DeleteAsync(It.IsAny <int>()))
            .Throws(new Exception());

            // Act
            var sut = new SalesApplicationService(
                mockLogManager.Object, mockSalesRepository.Object, mockSalesValidator.Object, mockFileUploader.Object);
            var response = await sut.DeleteAsync(It.IsAny <int>());

            // Assert
            response.IsSuccessful.Should().BeFalse();
            response.Errors.Count.Should().BeGreaterThan(0);
            response.Message.Should().NotBeNullOrEmpty();

            // Verify the application service is calling the correct repository method.
            mockSalesRepository.Verify(x => x.DeleteAsync(It.IsAny <int>()));

            // Verify the application service is logging the error.
            mockLogManager.Verify(x => x.LogError(It.IsAny <Exception>(), It.IsAny <string>()));
        }