public void AddRange()
{
StringStringDictionary dictionary = new StringStringDictionary();
dictionary.Add(new StringStringPair("four", "fourth value"));
dictionary.Add(new StringStringPair("five", "fifth value"));
Assert.Throws <NotSupportedException>(() => _readOnly.AddRange(dictionary));
_dictionary.AddRange(dictionary);
Assert.AreEqual(5, _dictionary.Count);
Assert.IsTrue(_dictionary.ContainsKey("four"));
Assert.IsTrue(_dictionary.ContainsValue("fourth value"));
Assert.IsTrue(_dictionary.ContainsKey("five"));
Assert.IsTrue(_dictionary.ContainsValue("fifth value"));
Assert.Throws <ArgumentException>(() => _dictionary.AddRange(dictionary));
}
