public void VerifyTotpUriIsCorrect()
        {
            var target = new TwoFactorAuth(issuer: "Test&Issuer");
            var data   = target.GetQrText("Test&Label", "VMR466AB62ZBOKHE");

            Assert.AreEqual("otpauth://totp/Test%26Label?secret=VMR466AB62ZBOKHE&issuer=Test%26Issuer&period=30&algorithm=SHA1&digits=6", data);
        }