public void CheckSetSunsetOf() { q = new SetCollection <int>(); var testSet1 = new int[] { 1, 2, 3, 4, 5 }; q.AddRange(testSet1); Assert.AreEqual(true, q.IsProperSubsetOf(new int[] { 5, 2, 3, 1, 4, 6, 5, 3, 1 })); }