Function treeTest

treeTest<T>(
root: TreeNode<T>,
seen?: TreeNode<T>[],
): [ok: boolean, msg: string, node: TreeNode<T>]
Validates the tree from root downwards.
Type Parameters
- T
Parameters
- root: TreeNode<T>
- seen: TreeNode<T>[] = []
Returns [ok: boolean, msg: string, node: TreeNode<T>]