test failures with pytest7: AttributeError: module 'humanfriendly.tests' has no attribute 'connect'

[sandrotosi]

Hello,
in debian we recently started the upgrade to pytest7, and now humanfriendly tests are failing with the error below:

# python3 -m pytest humanfriendly/tests.py::HumanFriendlyTestCase::test_touch --verbose
============================================================================================================================= test session starts ==============================================================================================================================
platform linux -- Python 3.10.5, pytest-7.1.2, pluggy-1.0.0 -- /usr/bin/python3
cachedir: .pytest_cache
rootdir: /build/humanfriendly-10.0, configfile: tox.ini
collected 1 item                                                                                                                                                                                                                                                               

humanfriendly/tests.py::HumanFriendlyTestCase::test_touch ERROR                                                                                                                                                                                                          [100%]

======= ERRORS =======
_______ ERROR at setup of HumanFriendlyTestCase.test_touch _______

app = <module 'humanfriendly.tests' from '/build/humanfriendly-10.0/humanfriendly/tests.py'>

    def setup(app):
        """
        Enable all of the provided Sphinx_ customizations.
    
        :param app: The Sphinx application object.
    
        The :func:`setup()` function makes it easy to enable all of the Sphinx
        customizations provided by the :mod:`humanfriendly.sphinx` module with the
        least amount of code. All you need to do is to add the module name to the
        ``extensions`` variable in your ``conf.py`` file:
    
        .. code-block:: python
    
           # Sphinx extension module names.
           extensions = [
               'sphinx.ext.autodoc',
               'sphinx.ext.doctest',
               'sphinx.ext.intersphinx',
               'humanfriendly.sphinx',
           ]
    
        When Sphinx sees the :mod:`humanfriendly.sphinx` name it will import the
        module and call its :func:`setup()` function. This function will then call
        the following:
    
        - :func:`enable_deprecation_notes()`
        - :func:`enable_man_role()`
        - :func:`enable_pypi_role()`
        - :func:`enable_special_methods()`
        - :func:`enable_usage_formatting()`
    
        Of course more functionality may be added at a later stage. If you don't
        like that idea you may be better of calling the individual functions from
        your own ``setup()`` function.
        """
        from humanfriendly import __version__
    
>       enable_deprecation_notes(app)

humanfriendly/sphinx.py:250: 
_ _ _ _ _

app = <module 'humanfriendly.tests' from '/build/humanfriendly-10.0/humanfriendly/tests.py'>

    def enable_deprecation_notes(app):
        """
        Enable documenting backwards compatibility aliases using the autodoc_ extension.
    
        :param app: The Sphinx application object.
    
        This function connects the :func:`deprecation_note_callback()` function to
        ``autodoc-process-docstring`` events.
    
        .. _autodoc: http://www.sphinx-doc.org/en/stable/ext/autodoc.html
        """
>       app.connect("autodoc-process-docstring", deprecation_note_callback)
E       AttributeError: module 'humanfriendly.tests' has no attribute 'connect'

humanfriendly/sphinx.py:112: AttributeError
======= short test summary info =======
ERROR humanfriendly/tests.py::HumanFriendlyTestCase::test_touch - AttributeError: module 'humanfriendly.tests' has no attribute 'connect'
======= 1 error in 0.12s =======

i tried for a while to figure out what's going on but i didnt manage to find the reason: can you help me out? thanks!

please note that running the test suite with pytest 6.2.5, it passes just fine, so it has to be something specific to python 7 (we're using 7.1.2 ftr)