[TIP] How can I mock pathlib.Path.open and pathlib.path.unlink with the same syntax?

[c.buhtz at posteo.jp]

Hello together,

and sorry for bothering this list with my rookie question. I still asked 
that did not received an answer: 
https://stackoverflow.com/q/70893660/4865723

I use pathlib.Path.open() and pathlib.Path.unlink() in my productive 
code. The unittest for that work. But I use two different ways to 
patch(). One with @patch decorator and one with a context manager with 
mock.patch().

I would like to use only the @patch decorater like this:

class MyTest(unittest.TestCase):
     @mock.patch('pathlib.Path.unlink')
     @mock.patch('pathlib.Path.open')
     def test_foobar(self, mock_open, mock_unlink):

But I use mock_opener() to input the simulated file content as you can 
see in that listing (also visible on StackOverflow). And I do not know 
how to use mock_opener() with the @patch decorator.

import unittest
from unittest import mock
import inspect
import pathlib

class MyTest(unittest.TestCase):
     @mock.patch('pathlib.Path.unlink')
     def test_foobar(self, mock_unlink):
         # simulated CSV file
         CSV_CONTENT = inspect.cleandoc("""
             A;B
             1;2
             2;1
         """)
         opener = mock.mock_open(read_data=CSV_CONTENT)

         with mock.patch('pathlib.Path.open', opener):
             result = validate_csv(file_path=pathlib.Path('foo.csv'))
             self.assertTrue(result)

Thanks in advance for reading this.
Kind
Christian