"python category.py move -from:x -to:y" is a simple and common operation from the user perspective, performed by the script category.py. Under the covers, quite a bit of integration occurs in order to make this seemingly simple operation work correctly.
As it has been broken a few times in the past, it would be good to build a test case which preps the test wiki, runs the script to perform the move, and then check the script performed the task correctly.