What was the first test that Gideon gave to God?

To make a fleece wet while keeping the ground dry

And Gideon said unto God, If thou wilt save Israel by mine hand, as thou hast said,

Behold, I will put a fleece of wool in the floor; and if the dew be on the fleece only, and it be dry upon all the earth beside, then shall I know that thou wilt save Israel by mine hand, as thou hast said. Judges 6:36-37