Irdeto Python Software Engineer interview questions

I submitted mi cv through linkedin, and after a few days they resply offering for a skype interview. After that I had the interview with a manager, and 2 technical leads. Manager asked questions related to behavior in work, previous experience. Technical leads asked questions related to technology, frameworks, linux, networks. after that they send and exercise to solve, the excercise was to write all the test cases for a machine that reads a card with a pin number, they provide details about the machin posibble codes, moreover you had to provide code to test the machine. and finally you had to write a python program that read files from a directory and compare some values inside of them.