Bug report

Bug description:

If test_exceptions.ExceptionTests.test_recursion_normalizing_infinite_exception fails, a huge amount of output is printed to the terminal, which is a pretty terrible user experience. The full output is here: exception_tb.txt.

To reproduce, run FORCE_COLOR ./python.exe -m unittest -v test.test_exceptions.ExceptionTests.test_recursion_normalizing_infinite_exception.

(Note that this issue isn't about the test failing when FORCE_COLOR is set. #117605 is about that. This issue is about the poor user experience if the test fails.)

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS

Linked PRs

• gh-117606: Truncate extremely long error message in test_exceptions #117670
• [3.12] gh-117606: Truncate extremely long error message in test_exceptions (GH-117670) #117745