Where does it say that?Ummmm....
Actually Adam used Eve as a guinea pig. He was right there with her watching to see if she died or not.
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, she took of the fruit thereof, and did eat, and gave also unto her husband with her; and he did eat.