public void SetByIndex()
{
Assert.Throws <ArgumentOutOfRangeException>(() =>
_dictionary.SetByIndex(-1, "new fourth value"));
Assert.Throws <ArgumentOutOfRangeException>(() =>
_dictionary.SetByIndex(3, "new fourth value"));
Assert.Throws <NotSupportedException>(() => _readOnly.SetByIndex(0, "new first value"));
_dictionary.SetByIndex(0, "new first value");
Assert.AreEqual("one", _dictionary.GetKey(0));
Assert.AreEqual(new CloneableType("new first value"), _dictionary.GetByIndex(0));
}