python check if a method is called without mocking it away
You can set the Mock.side_effect to be the original method.
from unittest.mock import MagicMockclass A(): def tmp(self): print("hi")def b(a): a.tmp()a = A()a.tmp = MagicMock(side_effect=a.tmp)b(a)a.tmp.assert_called()When side_effect is a function (or a bound method in this case, which is a kind of function), calling the Mock will also call the side_effect with the same arguments.
The Mock() call will return whatever the side_effect returns, unless it returns the unnittest.mock.DEFAULT singleton. Then it will return Mock.return_value instead.
Or you can decorate the method to test:
def check_called(fun): def wrapper(self, *args, **kw): attrname = "_{}_called".format(fun.__name__) setattr(self, attrname, True) return fun(self, *args, **kw) return wrappera = A()a.tmp = check_called(a.tmp)b(a)assert(getattr(a, "_tmp_called", False))but MagicMock's side_effect is definitly a better solution if you're already using Mock ;)