public void Base64_ToB64Url_Test()
		{
			var rnd = new CryptoRandom();
			Parallel.For(1, 5000, i =>
			{
				var byteArray = rnd.NextBytes(i);
				var offset = 0;
				var count = Math.Max(i, i - rnd.Next(10));
				var byteSegment = new ArraySegment<byte>(byteArray, offset, count);

				var b64url = byteSegment.ToB64Url();
				var b64 = byteSegment.ToB64();

				Assert.IsTrue(b64url + b64[b64.Length - 1] == b64);
				Assert.IsTrue(Enumerable.SequenceEqual(byteSegment, b64url.FromB64Url()));
			});
		}// Base64_ToB64Url_Test()