public void TestFindLongestPrefix()
{
Assert.AreEqual(6, RadixTree <object> .FindLongestPrefix("abcdef", "abcdef"));
Assert.AreEqual(3, RadixTree <object> .FindLongestPrefix("abcdef", "abcxyz"));
Assert.AreEqual(3, RadixTree <object> .FindLongestPrefix("abc", "abcxyz"));
Assert.AreEqual(3, RadixTree <object> .FindLongestPrefix("abcxyz", "abc"));
Assert.AreEqual(0, RadixTree <object> .FindLongestPrefix("abc", "xyz"));
}