public static void SignUri()
        {
            var signer    = new NullUrlSigner();
            var signedUri = signer.Sign(TestUri);

            Assert.Equal(TestUri, signedUri);
        }
        public static void SignString()
        {
            var signer       = new NullUrlSigner();
            var signedString = signer.Sign(TestString);

            Assert.Equal(TestString, signedString);
        }