public static void TestHexMethods()
{
char testChar = 'e';
Assert.True(Uri.IsHexDigit(testChar));
Assert.Equal(14, Uri.FromHex(testChar));
string hexString = Uri.HexEscape(testChar);
Assert.Equal(hexString, "%65");
int index = 0;
Assert.True(Uri.IsHexEncoding(hexString, index));
Assert.Equal(testChar, Uri.HexUnescape(hexString, ref index));
}