public virtual void TestClear()
{
var set = new CharArraySet(10, true);
for (int i = 0; i < TEST_STOP_WORDS.Length; i++) { set.Add(TEST_STOP_WORDS[i]); }
Assert.AreEqual(TEST_STOP_WORDS.Length, set.Count, "Not all words added");
Assert.Throws<NotSupportedException>(set.Clear, "remove is not supported");
Assert.AreEqual(TEST_STOP_WORDS.Length, set.Count, "Not all words added");
}