public void UniqufiyTest()
 {
     //9, 8, 7, 1, 2, 5, 6, 7, 8
     Vector<int> intVector = new Vector<int>(new int[] { 9, 8, 7, 1, 2, 5, 6, 7, 8 }, 9);
     intVector.Sort();
     Assert.IsTrue(intVector.Uniqufiy() == 2);
     Assert.IsTrue(intVector[0] == 1, "9");
     Assert.IsTrue(intVector[1] == 2, "8");
     Assert.IsTrue(intVector[2] == 5, "7");
     Assert.IsTrue(intVector[3] == 6, "1");
     Assert.IsTrue(intVector[4] == 7, "2");
     Assert.IsTrue(intVector[5] == 8, "5");
     Assert.IsTrue(intVector[6] == 9, "6");
 }