C# NUnit Test Except And Intersect

gistfile1.txt

[Test]
public void TestExceptAndIntersect()
{
    //check if equal with differing sequence
    var list1 = new List<int>(new int[] { 1, 2, 3, 4, 5, 6 });
    var list2 = new List<int>(new int[] { 6, 5, 4, 3, 2, 1 });
    var result = list1.Except(list2).ToList();
    Assert.AreEqual(new int[] { }, result);


    var oldList = new List<int>(new int[] { 1, 2, 3, 4, 5, 6 });
    var newList = new List<int>(new int[] { 3, 5, 6, 7, 8 });

    //get the intersect between the 2 lists
    var commonItems = newList.Intersect(oldList).ToList();
    Assert.AreEqual(new int[] { 3, 5, 6 }, commonItems);

    //what is in the first list that is not in the second list
    var toBeRemoved = oldList.Except(newList).ToList();
    var toBeAdded = newList.Except(oldList).ToList();
    Assert.IsFalse(toBeRemoved.Count == 0);
    Assert.IsFalse(toBeAdded.Count == 0);
    Assert.AreEqual(new int[] { 1, 2, 4 }, toBeRemoved);
    Assert.AreEqual(new int[] { 7, 8 }, toBeAdded);

    var updatedList = commonItems.Concat(toBeAdded).ToList();
    Assert.AreEqual(new int[] { 3, 5, 6, 7, 8 }, updatedList);
}