On Facebook group Calvinism, Arminianism, Pelagianism, Wesleyanism, Finneyism, Lutheranism, a Calvinist asks a question in a mocking tone:
If God did not want Adam to fall why did He not make the forbidden fruit repulsive to the eye with a foul odor? Genesis 3:6: And when the woman saw that the tree was good for food, and that it was pleasant to the eyes, and a tree to be desired to make one wise…
Notable street preacher Jed Smock replies:
God made the fruit of the tree attractive for the same reason a teacher when he tests his students with a multiple choice exam makes three out of four possible answers at least somewhat plausible so that it is a genuine test. The professor is not trying to trick his students; he is challenging them to study and examining them for their own benefit and to determine whether or not they have learned their lessons. Adam failed his test. Jesus passed all of his tests. Will be pass our tests and endure to the end? God expected Job to pass his tests; Satan anticipated that he would fail. God turned out to be right. Satan certainly does not believe that God has exhaustive and absolute foreknowledge of our future moral choices or he would not even challenged God on his estimation of Job’s character. It would seem to me that Satan is in a position to know whether or not God has absolute knowledge of everything that is going to happen.
God is Open 
We must always remember without a test there is no testimony. Although Satan had permission to test God’s chosen one Job, Satan still had to wait for an opportunity to do so. Satan had to wait until the next birthday bash in order to catch the door of opportunity to come in and be destructive. Once we let Satan in, the chaos will come. Good news we can also put Satan out and the peace will take over.