from path.Bar import Bar

class Foo:

    def __init__ ():
        self.bar_val = Bar()

    def func_under_test():
        ...

        if not self.bar_val.get_func2():
        ..
        else:
        ...

        return


class Bar:

    value2 = ...

    def __init__ ():
        pass

    def get_func1()
        ...
        return

    def get_func2()
        ...
        return value2


class TestFoo:

    @patch('dateipfad+name.Foo.Bar.get_func1')
    @patch('dateipfad+name.Foo.Bar.get_func2')
    def interessant(self, mocked_get_func1, mocked_get_func_2):
        mocked_get_func1.return_vaue = '{"a":"b"}'
        mocked_get_func2.return_vaue = None

        self.assert...()
        self.assert...()