beaker fails to build with Python 3.11.0a3.

======================================================================
ERROR: test_disk_units (bkr.common.test_schema.JobSchemaTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/beaker-28.2/Common/bkr/common/test_schema.py", line 408, in test_disk_units
    self.assert_not_valid('''
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/beaker-28.2/Common/bkr/common/test_schema.py", line 21, in assert_not_valid
    self.assert_(not schema.validate(lxml.etree.fromstring(xml)))
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'JobSchemaTest' object has no attribute 'assert_'

======================================================================
ERROR: test_duplicate_elements (bkr.common.test_schema.JobSchemaTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/beaker-28.2/Common/bkr/common/test_schema.py", line 189, in test_duplicate_elements
    self.assert_not_valid('''
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/beaker-28.2/Common/bkr/common/test_schema.py", line 21, in assert_not_valid
    self.assert_(not schema.validate(lxml.etree.fromstring(xml)))
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'JobSchemaTest' object has no attribute 'assert_'

======================================================================
ERROR: test_force_system (bkr.common.test_schema.JobSchemaTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/beaker-28.2/Common/bkr/common/test_schema.py", line 275, in test_force_system
    self.assert_not_valid('''
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/beaker-28.2/Common/bkr/common/test_schema.py", line 21, in assert_not_valid
    self.assert_(not schema.validate(lxml.etree.fromstring(xml)))
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'JobSchemaTest' object has no attribute 'assert_'

======================================================================
ERROR: test_hostRequires_not_optional (bkr.common.test_schema.JobSchemaTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/beaker-28.2/Common/bkr/common/test_schema.py", line 257, in test_hostRequires_not_optional
    self.assert_not_valid('''
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/beaker-28.2/Common/bkr/common/test_schema.py", line 21, in assert_not_valid
    self.assert_(not schema.validate(lxml.etree.fromstring(xml)))
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'JobSchemaTest' object has no attribute 'assert_'

======================================================================
ERROR: test_minimal_job_with_invalid_system_inventory_date (bkr.common.test_schema.JobSchemaTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/beaker-28.2/Common/bkr/common/test_schema.py", line 146, in test_minimal_job_with_invalid_system_inventory_date
    self.assert_not_valid('''
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/beaker-28.2/Common/bkr/common/test_schema.py", line 21, in assert_not_valid
    self.assert_(not schema.validate(lxml.etree.fromstring(xml)))
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'JobSchemaTest' object has no attribute 'assert_'

Removed many old deprecated unittest features:
    TestCase method aliases failUnlessEqual, failIfEqual, failUnless, failIf, failUnlessRaises, failUnlessAlmostEqual, failIfAlmostEqual (deprecated in Python 3.1), assertEquals, assertNotEquals, assert_, assertAlmostEquals, assertNotAlmostEquals, assertRegexpMatches, assertRaisesRegexp (deprecated in Python 3.2), and assertNotRegexpMatches (deprecated in Python 3.5).
    Undocumented and broken TestCase method assertDictContainsSubset (deprecated in Python 3.2).
    Undocumented <unittest.TestLoader.loadTestsFromModule> TestLoader.loadTestsFromModule() parameter use_load_tests (deprecated and ignored since Python 3.2).
    An alias of the TextTestResult class: _TextTestResult (deprecated in Python 3.2).
(Contributed by Serhiy Storchaka in bpo-45162.)

https://bugs.python.org/issue45162
https://docs.python.org/3.11/whatsnew/3.11.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.11/fedora-rawhide-x86_64/03137397-beaker/

For all our attempts to build beaker with Python 3.11, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.11/package/beaker/

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 3.11:
https://copr.fedorainfracloud.org/coprs/g/python/python3.11/

Let us know here if you have any questions.

Python 3.11 is planned to be included in Fedora 37. To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.11.
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.