Can I “fake” a package (or at least a module) in python for testing purposes?

by

Sure. Define a class, put the stuff you need inside that, assign the class to sys.modules["classname"].

class fakemodule(object):

    @staticmethod
    def method(a, b):
        return a+b

import sys
sys.modules["package.module"] = fakemodule

You could also use a separate module (call it fakemodule.py):

import fakemodule, sys

sys.modules["package.module"] = fakemodule

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