public void AssocExFailsOnExistingKey()
{
Dictionary <int, string> d = new Dictionary <int, string>();
d[1] = "a";
d[2] = "b";
IPersistentMap m1 = PersistentArrayMap.create(d);
IPersistentMap m2 = m1.assocEx(2, "c");
}
public void AssocExModifiesOnNewKey()
{
Dictionary <int, string> d = new Dictionary <int, string>();
d[1] = "a";
d[2] = "b";
IPersistentMap m1 = PersistentArrayMap.create(d);
IPersistentMap m2 = m1.assocEx(3, "c");
Expect(m1.count(), EqualTo(2));
Expect(m1.containsKey(3), False);
Expect(m2.count(), EqualTo(3));
Expect(m2.valAt(3), EqualTo("c"));
}