It does not appear our faith is on trial in the conditional sense, but in the proof sense. the gold will survive any fire. Why do you suppose Peter used such analogy? To conjure up the image of a wooden faith that would combust at the first sign of heat? Or gold, which endures the fires of life. He was preaching to encourage though who were heavy in spirit, that their faith would survive, not that they had yet another possible failure to hang over their head. The faith that is the gift of God, like gold, is not capable of destruction by lesser things. Though we go through much sorrow and challenge in this life, if we are among those listed here, the end is as secure as the beginning:
Rom 8:28-31 And we know that all things work together for good to them that love God, to them who are the called according to his purpose. (29) For whom he did foreknow, he also did predestinate to be conformed to the image of his Son, that he might be the firstborn among many brethren. (30) Moreover whom he did predestinate, them he also called: and whom he called, them he also justified: and whom he justified, them he also glorified. (31) What shall we then say to these things? If God be for us, who can be against us?
As for your preacher, it is to me a temptation to sin to ask me to judge his eternal state. I don’t know, and I would be presuming the role of God to make such a judgment. I urge you to withdraw that portion of your test. No good can come of it.