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

            mock.RepositoryMock.Setup(x => x.Get(It.IsAny <int>())).Returns(Task.FromResult <LinkTypes>(null));
            var service = new LinkTypesService(mock.LoggerMock.Object,
                                               mock.RepositoryMock.Object,
                                               mock.ModelValidatorMockFactory.LinkTypesModelValidatorMock.Object,
                                               mock.BOLMapperMockFactory.BOLLinkTypesMapperMock,
                                               mock.DALMapperMockFactory.DALLinkTypesMapperMock);

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

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