fedmsg fails to build with Python 3.10.0a2.

=================================== FAILURES ===================================
___________________ X509BaseTests.test_signed_by_expired_ca ____________________

self = <fedmsg.tests.crypto.test_x509.X509BaseTests testMethod=test_signed_by_expired_ca>

    def test_signed_by_expired_ca(self):
        """Assert certs signed by an expired CA fail validation."""
        self.config['certname'] = 'signed_by_expired_ca'
        self.config['ca_cert_location'] = os.path.join(SSLDIR, 'expired_ca.crt')
        # There's no CRL for this CA.
        self.config['crl_location'] = None
    
        signed = self.sign({'message': 'so secure'}, **self.config)
>       self.assertFalse(self.validate(signed, **self.config))
E       AssertionError: True is not false

fedmsg/tests/crypto/test_x509.py:193: AssertionError
_______________ X509CryptographyTests.test_signed_by_expired_ca ________________

self = <fedmsg.tests.crypto.test_x509.X509CryptographyTests testMethod=test_signed_by_expired_ca>

    def test_signed_by_expired_ca(self):
        """Assert certs signed by an expired CA fail validation."""
        self.config['certname'] = 'signed_by_expired_ca'
        self.config['ca_cert_location'] = os.path.join(SSLDIR, 'expired_ca.crt')
        # There's no CRL for this CA.
        self.config['crl_location'] = None
    
        signed = self.sign({'message': 'so secure'}, **self.config)
>       self.assertFalse(self.validate(signed, **self.config))
E       AssertionError: True is not false

fedmsg/tests/crypto/test_x509.py:193: AssertionError

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.10/fedora-rawhide-x86_64/01756926-fedmsg/

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

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.