public void ComparesNullElementsAsEqual()
{
var comparer = EqualityCompare <int?> .Null();
var objectComparer = comparer as System.Collections.IEqualityComparer;
Assert.IsTrue(comparer.Equals(null, null));
Assert.IsTrue(objectComparer.Equals(null, null));
Assert.AreEqual(comparer.GetHashCode(null), comparer.GetHashCode(null));
Assert.AreEqual(objectComparer.GetHashCode(null), objectComparer.GetHashCode(null));
}