Question: Python 3. BST (Binary Search Tree). I keep getting errors whenever i run the program and the unittest, not sure what I did wrong. Really

Python 3. BST (Binary Search Tree). I keep getting errors whenever i run the program and the unittest, not sure what I did wrong. Really appriciate your help.

Here is the program instruction/ outline : https://jpst.it/1iBAj

And here is my code : https://jpst.it/1iRx8

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