Does God Tests and tries us?

Who tests and tries us? Who brings tests and trials into the life of the Christian? Is it God or the devil? It is popular thinking to blame the devil for any pain or suffering we experience as Christian. And sometimes the devil is involved in our tests and trials. However, King David had a different view of the source of trial that come to leaders in preparation for God's service. "The Lord testeth the righteous (Ps 11:5). We can also Praise God that most often we are not dealing with the devil in our trials and problems. We are dealing with God, or our own misdeeds.