public void Given_an_array_when_call_three_sum_then_return_all_unique_triplets_that_sum_is_zero()
        {
            var solution = new ThreeSum();
            var result   = solution.Sum(_numbers);

            Assert.Equal(_expected, result);

            var result1 = solution.Sums(_numbers);

            Assert.Equal(_expected, result1);
        }