public void L1_Secret_IsNullOrEmpty_Test()
        {
            Assert.Throws <System.ArgumentNullException>(() => baseString.L1Signature(null));
            Assert.Throws <System.ArgumentNullException>(() => baseString.L1Signature(""));

            Assert.Throws <System.ArgumentNullException>(() => ApiAuthorization.L1Signature(baseString, null));
            Assert.Throws <System.ArgumentNullException>(() => ApiAuthorization.L1Signature(baseString, ""));
        }
        public void L1_BaseString_IsNullOrEmpty_Test()
        {
            string testBaseString = null;

            Assert.Throws <System.ArgumentNullException>(() => testBaseString.L1Signature(secret));
            Assert.Throws <System.ArgumentNullException>(() => "".L1Signature(secret));

            Assert.Throws <System.ArgumentNullException>(() => ApiAuthorization.L1Signature(null, secret));
            Assert.Throws <System.ArgumentNullException>(() => ApiAuthorization.L1Signature("", secret));
        }