public void HashCodeBasedOnValue()
{
Dictionary <int, string> d = new Dictionary <int, string>();
d[1] = "a";
d[2] = "b";
IPersistentMap m1 = PersistentArrayMap.create(d);
d[3] = "c";
IPersistentMap m2 = PersistentArrayMap.create(d);
Expect(m1.GetHashCode(), Not.EqualTo(m2.GetHashCode()));
}