Why didn’t God give Adam and Eve a commandment not to talk to Serpent?

Obviously, the temptation began only after Eve spoke with Satan. Prior to that, it seems Adam and Eve had no trouble avoiding the forbidden tree, even though it stood in the midst of the garden. At least, we have no record suggesting they felt any temptation. However, it was only after Eve's conversation with Satan that she saw the tree as attractive and its fruit as desirable for food. So, why didn’t the all-knowing God — who surely knew that Satan’s words would have triggered temptation — give them a commandment not to speak to him? EDIT: Ok, here we go again: I want to know the perspectives on this matter from the Catholicism, the Orthodoxy, and the main-stream Protestantism (which is believers in Christ who besides addressing God the Father, also address Jesus in their prayers).