public void AddUserAttribute_LastInWins()
{
var key = "testKey";
var valueA = "valueA";
var valueB = "valueB";
var metadata = new TransactionMetadata();
metadata.AddUserAttribute(key, valueA);
metadata.AddUserAttribute(key, valueB);
var immutableTransactionMetadata = metadata.ConvertToImmutableMetadata();
var userAttributes = immutableTransactionMetadata.UserAttributes.ToDictionary();
var result = userAttributes[key];
Assert.AreEqual(result, valueB);
}