How to get predictions of new test data?

[kimhs950627]

First, thank you for the awesome package.
I'm wondering how to get a prediction from the test data.
Let's say that I build online advertisement recommendation system using multi armed bandit problem. I build simulator and history for certain data(Replay Evaluator bandit, Linear UCB policy with 100-dimensional context vectors). I want to see what's the optimal output(what advertisement should be represented) with my test data.
I tried "predict" function with simulator or agents, and none of them worked. I really look forward to your help.
Thanks!