public async Task Add_RowIsAdded_DbContainsEntry()
        {
            var user = new User {
                Address = "address", FullName = "name", PhoneNumber = 47
            };
            bool success = await repo.Add(user);

            Assert.True(success);
            Assert.NotNull(repo[user.Id]);
            var _user = await repo.Get(user.Id);

            Assert.NotNull(_user);
            Assert.Equal(_user.Id, user.Id);
            Assert.Equal(_user.Address, user.Address);
            Assert.Equal(_user.FullName, user.FullName);
            Assert.Equal(_user.PhoneNumber, user.PhoneNumber);
            await repo.Remove(user.Id);
        }