public async void Get_null_record()
        {
            var mock = new ServiceMockFacade <IIllustrationRepository>();

            mock.RepositoryMock.Setup(x => x.Get(It.IsAny <int>())).Returns(Task.FromResult <Illustration>(null));
            var service = new IllustrationService(mock.LoggerMock.Object,
                                                  mock.RepositoryMock.Object,
                                                  mock.ModelValidatorMockFactory.IllustrationModelValidatorMock.Object,
                                                  mock.BOLMapperMockFactory.BOLIllustrationMapperMock,
                                                  mock.DALMapperMockFactory.DALIllustrationMapperMock);

            ApiIllustrationResponseModel response = await service.Get(default(int));

            response.Should().BeNull();
            mock.RepositoryMock.Verify(x => x.Get(It.IsAny <int>()));
        }