I want to use patch to record all function calls made to a function in a class for a unittest, but need the original function to still run as expected. I created a dummy code example below:

from mock import patchclass A(object):def __init__(self):self._a = 1class B(A):def __init__(self):super(B, self).__init__() # TypeError: super() argument 1 must be type, not MagicMockself._b = 11def bar(self, b):self._b = self._b + 1 + bdef foo(self, b):self.bar(b)class MockB(B):def foo(self, b):super(MockB, self).foo(self, b)@patch('main.B')
def main(b_class):b_class.side_effect = MockBb = B()print b._b # 11b.foo(0)print b._b # 12main()

In my case, the instance of the class b = B() is not actually in the main function but in another module, so I can't Mock the instance. I need it to generically be a decorator for all instances of B.

Summary: I am not sure how to individually mock the class method on it's own, but still call the original method. After, I want to use something like call_args_list where I can see all calls made to foo().

I think you are looking for the wraps Mock parameter. Search the official documentation for wraps. Accessing attributes returns a mock object. Calling methods gives the real method result instead, if a return value is not configured for the mock.