public void Test_Swap()
{
var list = new[] { 1, 2, 3 };
list.Swap(0, 2);
Assert.AreEqual(list[0], 3);
}
public void ListExtensions_Manipulate_Swap()
{
var arr = new[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
//reverse list in place
for (int i = 0; i < 5; i++)
arr.Swap(i, 9 - i);
for (int i = 0; i <= 9; i++)
Assert.AreEqual(9 - i, arr[i]);
}