Draw a decision tree for binary search performed on a list of size 18. Each node should show the position of the element examined.

Use the following array given below:

{1, 2, 3, 4, 5. 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18}

Use test cases to check if the tree is correct