How to ensure method calls order

ensure-calls.py

class Handler:
    
    def handle(self):
        self.process()
        self.postprocess()
        
    def process(self):
        pass
    
    def postprocess(self):
        pass

handler = Handler()

"""
Problem: how to mock things so I can ensure that if I call

    handler.handle()
    
the handler.process is called *before* handler.postprocess ?
"""

Oh, so the solution is to use mock_calls.

mocked = mock.Mock()

handler = Handler()
handler.process = mocked.process
handler.postprocess = mocked.postprocess

handler.handle()

assert mocked.mock_calls == [mock.call.process(), mock.call.postprocess()]