public void LTDDelResTest()
        {
            IDataManager dm = new LocalTestData();

            bool result  = dm.RemoveRestaurant(1);
            var  nullRef = dm.GetRestaurant(1);

            Assert.IsTrue(result);
            Assert.IsNull(nullRef);
        }
        public void LTDDelResCascTest()
        {
            IDataManager dm = new LocalTestData();

            dm.RemoveRestaurant(1);
            var nullRef1 = dm.GetReview(1);
            var nullRef2 = dm.GetReview(2);
            var nullRef3 = dm.GetReview(3);

            Assert.IsNull(nullRef1);
            Assert.IsNull(nullRef2);
            Assert.IsNull(nullRef3);
        }