public void ComparesInverted()
 {
     _comparer.Invert();
     Assert.AreEqual(1, _comparer.Compare((short)1, (short)2));
     Assert.AreEqual(0, _comparer.Compare((short)2, (short)2));
     Assert.AreEqual(-1, _comparer.Compare((short)2, (short)1));
 }