$3.(4$ points$)$ Below the BinarySearchTree class definition in binary search tree.py$,$ test your

new delete and find iterative methods. Be sure to include tests for the following:

$$ Deleting a leaf node $($a node with no children$)$

$$ Deleting a node with a single left child

$$ Deleting a node with a single right child

$$ Deleting a node with two children

$$ Finding a node that exists in the tree

$$ Finding a node that does not exist in the tree