public virtual void TestUnmodifiableSet()
{
CharArraySet set_Renamed = new CharArraySet(10, true);
set_Renamed.AddAll(new List<string>(TEST_STOP_WORDS));
int size = set_Renamed.Count;
set_Renamed = CharArraySet.UnmodifiableSet(set_Renamed);
Assert.AreEqual(size, set_Renamed.Count, "Set size changed due to UnmodifiableSet call");
Assert.Throws<ArgumentNullException>(() => CharArraySet.UnmodifiableSet(null), "can not make null unmodifiable");
}
}