public void ShouldReturnEmpty2DArraySumToTargetNumber()
        {
            var arr          = new int[] { 12, 3, 1, 2, -6, 5, -8, 6 };
            var targetNumber = 45;

            var result = ThreeNumbersSum.ThreeNumbersSumSolutionOne(arr, targetNumber);

            result.Count.Should().Be(0);
        }
        public void ShouldReturnExpectedThreeNumbersSumToTargetNumber()
        {
            var arr          = new int[] { 12, 3, 1, 2, -6, 5, -8, 6 };
            var targetNumber = 0;

            var result = ThreeNumbersSum.ThreeNumbersSumSolutionOne(arr, targetNumber);

            result.Count.Should().Be(3);
        }