public void CheckSetExceptWith()
{
q = new SetCollection <int>();
var testSet1 = new int[] { 1, 2, 3, 4, 5 };
q.AddRange(testSet1);
q.ExceptWith(new int[] { 2, 4 });
var expected = new int[] { 1, 3, 5 };
CollectionAssert.AreEqual(expected, q);
}