public void Backlog_serive_Delete_method_throw_nullReferenceException()
        {
            UserStory backlog = new UserStory();

            var mockrepo = new Mock <IBacklogRepository>();

            mockrepo.Setup(x => x.Delete(It.IsAny <int>())).Throws(new NullReferenceException());
            BacklogService obj = new BacklogService(mockrepo.Object);

            var exception = Record.Exception(() => obj.Delete(It.IsAny <int>()));

            Assert.IsType <NullReferenceException>(exception);
        }
        public void Backlog_serive_Delete_method_throw_exception_with_invalid_value_type()
        {
            UserStory backlog = new UserStory();



            var mockrepo = new Mock <IBacklogRepository>();

            mockrepo.Setup(x => x.Delete(It.IsAny <int>())).Throws(new FormatException());
            BacklogService obj = new BacklogService(mockrepo.Object);

            var exception = Record.Exception(() => obj.Delete(It.IsAny <int>()));

            Assert.IsType <FormatException>(exception);
        }