There is a fundamental difference between putting God to the test, and testing whether things come from God. Consider:
“Lord, I believe you are calling me to the priesthood, but I do not wish to make such a drastic decision without further confirmation from you.” You are trying to seek out God, and this request is completely self giving and trying to discern God’s will. You are not testing God, but testing your own interpretation of his message.
as opposed to:
“God, if you really want me to stop sleeping with my girlfriend, let me win the lottery.” This is not directed to God. We already have reasonable knowledge to determine God doesn’t want us sleeping with our girlfriend. To require more of him for something he has already told us is putting him to the test.
In short: As what I’m requesting of God done because I don’t trust my own sinfulness and wrong judgement, or because I already know, I just need God to prove himself?
Josh