public void Result_replace_values_x_with_values_y_test()
{
List <int> x = new List <int> {
9, 8, 2, 9
};
List <int> expected = new List <int> {
7, 8, 2, 7
};
List <int> actual = arraySorter.replaceXWithY(x);
CollectionAssert.AreEqual(expected, actual);
}