unittest.TestResult.testsRun no longer counts skipped tests.

[felixxm]

Bug report

Bug description:

unittest.TestResult.testsRun no longer counts skipped tests in Python 3.13.0a1. I couldn't not find anything in the release notes, so maybe it's not an intended change 🤔 If it was changed on purpose I can adjust our test. Thanks!

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

[AlexWaygood]

Which module are we talking about here?

[felixxm]

Which module are we talking about here?

unittest

[terryjreedy]

Intentional change viewed as a bugfix. In the 3.13 changelog changelog:
gh-106584: Fix exit code for unittest if all tests are skipped.
The corresponding PR 106588 starts "Increase the number of running tests only if a test hasn't been skipped." This was merged into 3.13 a week before 3.12.0 was released and the backport was deferred until after that release to appear in 3.12.1. In the diff, the call to result.startTest, which increments testsRun, is moved below the skip return with comment "# Increase the number of tests only if it hasn't been skipped".

[felixxm]

Intentional change viewed as a bugfix. In the 3.13 changelog changelog: gh-106584: Fix exit code for unittest if all tests are skipped. The corresponding PR 106588 starts "Increase the number of running tests only if a test hasn't been skipped." This was merged into 3.13 a week before 3.12.0 was released and the backport was deferred until after that release to appear in 3.12.1. In the diff, the call to result.startTest, which increments testsRun, is moved below the skip return with comment "# Increase the number of tests only if it hasn't been skipped".

@terryjreedy Many thanks for the detailed explanation 🌟