heads-up: test failures with Python 3.13~alpha1 - indentation doesn't match the expected

[befeleme]

BUG/PROBLEM REPORT / FEATURE REQUEST

What I did:

In Fedora Linux, we're attempting to rebuild the system with the early Python 3.13 releases.
The test failure happens with Python 3.13~alpha1 during the RPM build.

In What's new in Python 3.13 there's:

Compiler now strip indents from docstrings. This will reduce the size of bytecode cache (e.g. .pyc file). For example, cache file size for sqlalchemy.orm.session in SQLAlchemy 2.0 is reduced by about 5%. This change will affect tools using docstrings, like doctest. (Contributed by Inada Naoki in gh-81283.)

What I expect to happen:

Successful build

What actually happened:

+ python3 -m unittest discover -s zope/interface -t .
................................s......................s.........................................................ss.....s.............s.s..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................F..........F....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
======================================================================
FAIL: test_asReStructuredText_empty_with_multiline_docstring (zope.interface.tests.test_document.Test_asReStructuredText.test_asReStructuredText_empty_with_multiline_docstring)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILDROOT/python-zope-interface-6.0-2.fc40.x86_64/usr/lib64/python3.13/site-packages/zope/interface/tests/test_document.py", line 298, in test_asReStructuredText_empty_with_multiline_docstring
    self.assertEqual(self._callFUT(IEmpty), EXPECTED)
AssertionError: '``IE[39 chars]n \n It can be used to annotate any class or o[66 chars]\n\n' != '``IE[39 chars]n \n             It can be used to annotate an[90 chars]\n\n'
  ``IEmpty``
  
   This is an empty interface.
   
-  It can be used to annotate any class or object, because it promises
+              It can be used to annotate any class or object, because it promises
? ++++++++++++
-  nothing.
+              nothing.
  
   Attributes:
  
   Methods:
======================================================================
FAIL: test_asStructuredText_empty_with_multiline_docstring (zope.interface.tests.test_document.Test_asStructuredText.test_asStructuredText_empty_with_multiline_docstring)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILDROOT/python-zope-interface-6.0-2.fc40.x86_64/usr/lib64/python3.13/site-packages/zope/interface/tests/test_document.py", line 74, in test_asStructuredText_empty_with_multiline_docstring
    self.assertEqual(self._callFUT(IEmpty), EXPECTED)
AssertionError: 'IEmp[35 chars]n \n It can be used to annotate any class or o[66 chars]\n\n' != 'IEmp[35 chars]n \n             It can be used to annotate an[90 chars]\n\n'
  IEmpty
  
   This is an empty interface.
   
-  It can be used to annotate any class or object, because it promises
+              It can be used to annotate any class or object, because it promises
? ++++++++++++
-  nothing.
+              nothing.
  
   Attributes:
  
   Methods:

----------------------------------------------------------------------
Ran 1355 tests in 0.391s

FAILED (failures=2, skipped=7)

[icemac]

Thank you for reporting this issue, I'll activate Python 3.13 in GitHub actions to see if it comes this far.

[icemac]

This seems currently to be blocked by python-cffi/cffi#23, so we'll probably will not get to a test run at all.

[frenzymadness]

Should the test for Python 3.13+ simply check the docstring without the indentation? Or is there any hidden meaning? I can prepare a PR and test it on Fedora.

[icemac]

The function under test converts the docstring to (re-)structured text. So the test for 3.13+ can just leave out the indentation.