$ gh repo clone nipy/nibabel
$ cd nibabel
$ git checkout 5.3.2
$ python3.12 -m venv _e
$ . _e/bin/activate
(_e) $ pip install -e .[test]
(_e) $ pytest --doctest-modules --doctest-plus -v --pyargs nibabel
[…]
=========================================================================================== short test summary info ============================================================================================
FAILED nibabel/tests/test_api_validators.py::TestRunAllTests::test_first - AttributeError: 'dict' object has no attribute 'add'
FAILED nibabel/tests/test_api_validators.py::TestRunAllTests::test_second - AttributeError: 'dict' object has no attribute 'add'
ERROR nibabel/tests/test_api_validators.py::TestRunAllTests::test_second - AssertionError: assert {} == {'first', 'second'}
==================================================== 2 failed, 5275 passed, 305 skipped, 40 xfailed, 4 xpassed, 27003 warnings, 1 error in 67.24s (0:01:07) ====================================================

==================================================================================================== ERRORS ====================================================================================================
_______________________________________________________________________________ ERROR at teardown of TestRunAllTests.test_second _______________________________________________________________________________

cls = <class 'nibabel.tests.test_api_validators.TestRunAllTests'>

    @classmethod
    def teardown_class(cls):
        # Check that both validate_xxx tests got run
>       assert cls.run_tests == {'first', 'second'}
E       AssertionError: assert {} == {'first', 'second'}
E         
E         Full diff:
E         + {}
E         - {
E         -     'first',
E         -     'second',
E         - }

nibabel/tests/test_api_validators.py:116: AssertionError   
=================================================================================================== FAILURES ===================================================================================================
__________________________________________________________________________________________ TestRunAllTests.test_first __________________________________________________________________________________________

self = <nibabel.tests.test_api_validators.TestRunAllTests object at 0x7f9886f7cfe0>

    def meth(self):
        for imaker, params in self.obj_params():
>           validator(self, imaker, params)

nibabel/tests/test_api_validators.py:22:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <nibabel.tests.test_api_validators.TestRunAllTests object at 0x7f9886f7cfe0>, obj = 1, param = 2

    def validate_first(self, obj, param):
>       self.run_tests.add('first')
E       AttributeError: 'dict' object has no attribute 'add'

nibabel/tests/test_api_validators.py:108: AttributeError   
_________________________________________________________________________________________ TestRunAllTests.test_second __________________________________________________________________________________________

self = <nibabel.tests.test_api_validators.TestRunAllTests object at 0x7f9886f7d1c0>

    def meth(self):
        for imaker, params in self.obj_params():
>           validator(self, imaker, params)

nibabel/tests/test_api_validators.py:22:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <nibabel.tests.test_api_validators.TestRunAllTests object at 0x7f9886f7d1c0>, obj = 1, param = 2

    def validate_second(self, obj, param):
>       self.run_tests.add('second')
E       AttributeError: 'dict' object has no attribute 'add'

nibabel/tests/test_api_validators.py:111: AttributeError