It is quite simple really, just have a few programs:
Has a few function to generate random integers, list of integers and strings. Use this to generate test cases
Should be used to check real time of execution
Should be used to compare your solution vs a brute force (or a different implementation)
How to use it? Every time you have a bug, you do the following:
1. Add the file you want to test in that folder and call it tested.py
2. Code a brute force version and call it brute_force.py
3. Change the parameters in compare.sh : you want to chose the typical size of your "big" test cases and "small" test cases. This is explained in the video, but basically you want to test your solution against really big input obviously, but also smallish inputs that will be more likely to generate corner cases.
And that's it. Funny thing is that sometimes I will find my bug just by writing the code to generate test cases...