python-sciunit fails to build with Python 3.10.0a5.

+ /usr/bin/python3 -m sciunit.unit_test buffer
Traceback (most recent call last):
  File "/usr/lib64/python3.10/runpy.py", line 188, in _run_module_as_main
    mod_name, mod_spec, code = _get_module_details(mod_name, _Error)
  File "/usr/lib64/python3.10/runpy.py", line 111, in _get_module_details
    __import__(pkg_name)
  File "/builddir/build/BUILD/sciunit-f49d2fb5a108c4d86aee42dd840af7a8e17b382f/sciunit/__init__.py", line 10, in <module>
    from .utils import settings, log
  File "/builddir/build/BUILD/sciunit-f49d2fb5a108c4d86aee42dd840af7a8e17b382f/sciunit/utils.py", line 33, in <module>
    import cypy
  File "/usr/lib/python3.10/site-packages/cypy/__init__.py", line 1910, in <module>
    class OrderedSet(collections.MutableSet):
AttributeError: module 'collections' has no attribute 'MutableSet'


The deprecated aliases to Collections Abstract Base Classes were removed from the collections module.
https://docs.python.org/3.10/whatsnew/changelog.html#python-3-10-0-alpha-5
https://bugs.python.org/issue37324

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.10/fedora-rawhide-x86_64/01952459-python-sciunit/

For all our attempts to build python-sciunit with Python 3.10, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.10/package/python-sciunit/

Testing and mass rebuild of packages is happening in copr. You can follow these instructions to test locally in mock if your package builds with Python 3.10:
https://copr.fedorainfracloud.org/coprs/g/python/python3.10/

Let us know here if you have any questions.

Python 3.10 will be included in Fedora 35. To make that update smoother, we're building Fedora packages with early pre-releases of Python 3.10.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires), so if this package is required a lot, it's important for us to get it fixed soon.
We'd appreciate help from the people who know this package best, but if you don't want to work on this now, let us know so we can try to work around it on our side.