side_effect function of PropertyMock gets called only once

Bug report

Expected behavior

The side_effect function of a PropertyMock should work like the side_effect function of other Mock-Objects

Seen behavior

side_effect function of PropertyMock is called only once instead of twice in below example.

Minimal example

File dut.py:

class Class1():
    def __init__(self, name):
        self.__name = name

    @property
    def name(self):
        return self.__name

    def name_func(self):
        return self.__name


class Class2():
    def __init__(self, name, class1):
        self.__name = name
        self.__class1 = class1

    @property
    def name(self):
        return self.__name
    @property
    def class1(self):
        return self.__class1

File test\test_dut.py:

import dut
import unittest
from unittest.mock import patch, PropertyMock

class TestClass2(unittest.TestCase):
    def test_func(self):
        side_effect_counter = -1
        def side_effect_func(_):
            nonlocal side_effect_counter
            side_effect_counter += 1
            return f'text_{side_effect_counter}'

        c2_1 = dut.Class2('class2',  dut.Class1('class1'))
        c2_2 = dut.Class2('class2_2', dut.Class1('class1_2'))
        with patch('test_dut.dut.Class1.name_func', side_effect=side_effect_func, autospec=True):
            print(f'{c2_2.class1.name_func()}, {c2_1.class1.name_func()}')

    def test_prop(self):
        side_effect_counter = -1
        def side_effect_func():
            nonlocal side_effect_counter
            side_effect_counter += 1
            return f'text_{side_effect_counter}'

        c2_1 = dut.Class2('class2',  dut.Class1('class1'))
        c2_2 = dut.Class2('class2_2', dut.Class1('class1_2'))
        with patch.object(dut.Class1, 'name', new_callable=PropertyMock(side_effect=side_effect_func)):
            print(f'{c2_2.class1.name}, {c2_1.class1.name}')

Call from command line: pytest -rP test\test_dut.py

This produces the following output (problematic line marked by me):

============================================================================================== test session starts ==============================================================================================
platform win32 -- Python 3.9.12, pytest-7.1.2, pluggy-1.0.0
rootdir: C:\Users\klosemic\Documents\playground_mocks
plugins: hypothesis-6.46.5, cov-3.0.0, forked-1.4.0, html-3.1.1, metadata-2.0.1, xdist-2.5.0
collected 2 items

test\test_dut.py ..                                                                                                                                                                                        [100%]

==================================================================================================== PASSES =====================================================================================================
_____________________________________________________________________________________________ TestClass2.test_func ______________________________________________________________________________________________
--------------------------------------------------------------------------------------------- Captured stdout call ----------------------------------------------------------------------------------------------
text_0, text_1
_____________________________________________________________________________________________ TestClass2.test_prop ______________________________________________________________________________________________
--------------------------------------------------------------------------------------------- Captured stdout call ----------------------------------------------------------------------------------------------
text_0, text_0 <<<<<< HERE IS THE PROBLEM
=============================================================================================== 2 passed in 0.46s ===============================================================================================

Your environment
Windows 10, Python 3.9.12.
More version information can be found in the output of example above

Bắt đầu bằng cách tái hiện vấn đề với dut.py được cung cấp và ví dụ test/test_dut.py, đồng thời so sánh PropertyMock với trường hợp Mock side_effect đang hoạt động. Theo dõi hành vi của unittest.mock PropertyMock và thêm một bài kiểm thử hồi quy cho thấy hàm side_effect chạy ở mỗi lần truy cập thuộc tính, sau đó chạy lệnh pytest được cung cấp.