public void TokenParserTest_Serializes_TokenCollection()
        {
            //arrange
            var tokenCollectionSerializer = new TokenCollectionSerializer();

            //act
            var result = tokenCollectionSerializer.SerializeTokenEmailPairs(new Dictionary<string, TokenInfo>
            {
                {"a",new TokenInfo { AccessToken = "b",AccessTokenSecret = "c"} },
                {"d",new TokenInfo { AccessToken = "e", AccessTokenSecret ="f"} },
            });

            //assert
            Assert.AreEqual("a,b,c:d,e,f", result);
        }