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Somewhere in the failure message for tests Guido would like to see the fully qualified test name, suitable for copying and pasting into a test runner invocation for running just that test.

+10 :)

Which failure message are we talking about? regrtest? unittest?

I'm pretty sure Michael is talking about unittest. Doing the same for regrtest would be interesting but not as important. (When I run individual tests from the Python test suite I generally use -m unittest to do it.)

Included is a patch with the suggested change.
I changed the TestCase.__str__ method to:
 return "%s (%s.%s)" % (self._testMethodName, strclass(self.__class__), self._testMethodName)
instead of
 return "%s (%s)" % (self._testMethodName, strclass(self.__class__))
So now a failed test look like this:
======================================================================
ERROR: test_error_handling (Lib.test.test_logging.StreamHandlerTest.test_error_handling)
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/home/aviv/dev/cpython/Lib/test/test_logging.py", line 641, in test_error_handling
 self.assertIs(h.error_record, r)
AttributeError: 'TestStreamHandler' object has no attribute 'error_record'
----------------------------------------------------------------------

Hopefully somebody on the core-mentorship list can move this forward by converting to a PR and reviewing.
If @palaviv is still active the review itself will still be useful.

The provided patch wasn't entirely compatible with the current upstream code. I used the patch file to apply the changes to `Lib/unittest/case.py`, resolved the remaining conflicts with the patches to the test files and amended existing tests for the library.
I updated the documentation for unittest to reflect the changes in behaviour.

New changeset 755be9b1505af591b9f2ee424a6525b6c2b65ce9 by Sam Ezeh in branch 'main':
bpo-14265: Adds fully qualified test name to unittest output (GH-32138)
https://github.com/python/cpython/commit/755be9b1505af591b9f2ee424a6525b6c2b65ce9