public virtual void TestKeySetEntrySetAndValues()
{
Assert.IsTrue(mm.Put("key1", "value1"));
Assert.IsTrue(mm.Put("key1", "value2"));
Assert.IsTrue(mm.Put("key1", "value3"));
Assert.IsTrue(mm.Put("key2", "value4"));
Assert.IsTrue(mm.Put("key2", "value5"));
Assert.AreEqual(2, mm.KeySet().Count);
Assert.AreEqual(5, mm.Values().Count);
Assert.AreEqual(5, mm.EntrySet().Count);
}