How do I test that my program is robust to unexpected shut-downs?

My python code will run on a microcontroller that shuts off unexpectedly. I would like to test each part of the code rebooting unexpectedly and verify that it handles this correctly.

Attempt:
I tried putting code into its own process, then terminating it early, but this doesn't work because MyClass calls 7zip from the command line which continues even after process dies:

```
import multiprocessing
import os

def MyClass(multiprocessing.Process):
   ...
   def run():
      os.system("7z a myfile.7z myfile")

process = MyClass()
process.start()
time.sleep(4)
print("terminating early")
process.terminate()
print("done")

```

What I want:

```
class TestMyClass(unittest.TestCase):
    def test_MyClass_continuity(self):
        myclass = MyClass().start()
        myclass.kill_everything()
        myclass = MyClass().start()
        self.assert_everything_worked_as_expected()

```

Is there an easy way to do this? If not, how do you design robust code that could terminate at any point (e.g. testing state machines)?

Similar question (unanswered as of 26/10/21): [Simulating abnormal termination in pytest](https://stackoverflow.com/questions/44251891/simulating-abnormal-termination-in-pytest)

Thanks a lot!