public void Test_SelectDCValues()
{
// generate random array
int[,] input = ArrayHelper.GetTwoDimensionalArrayOfLength(16);
// do the zick zack
List <int[]> output = ZickZack.ZickZackSortChannel(input);
// Action
int[] expected = new[] { 0, 8, 128, 136 };
int[] actual = Coefficients.SelectDCValues(output);
// Assertion
actual.Should().BeEquivalentTo(expected);
}