Fix file attribute in ListTestsAsXml for abstract class inheritance

[joteejotee]

The file attribute of <testCaseClass> nodes in --list-tests-xml output was incorrect when test methods were inherited from abstract base classes. The file path pointed to the abstract class file instead of the concrete test class file.

This fix uses ReflectionClass to get the actual class file path instead of the method file path.

Fixes #6097

[joteejotee]

💡 Note: Although GitHub UI shows a merge conflict, the branch is already rebased onto upstream/10.5 and contains only a single clean commit.
There are no actual conflicts, and the changes can be safely merged.

Please let me know if any adjustments are needed!

[sebastianbergmann]

This looks wrong.

[sebastianbergmann]

This looks wrong.

[sebastianbergmann]

"branch is already rebased onto upstream/10.5" conflicts with the target of this PR being main.

[joteejotee]

Thanks for the quick review!
I'll fix the test files as you pointed out and also update the target branch of this PR to 10.5 to avoid the merge conflict warning.
I'll push the updates shortly.

[joteejotee]

Sorry about that — I forgot to include the changelog entry initially. I've now added it to ChangeLog-10.5.md following the project format.

[sebastianbergmann]

Sorry about that — I forgot to include the changelog entry initially. I've now added it to ChangeLog-10.5.md following the project format.

For future reference: please don't, I take care of the ChangeLog after merging a pull request.

[sebastianbergmann]

PHPUnit 10.5 does not generate a file attribute in the document generated using --list-tests-xml so there is nothing to fix. However, this pull request introduces said file attribute. Futhermore, PHPUnit 10.5 no longer receives bug fixes.

I have now merged @mondrake's tests from #6101 into 11.5 and applied your fix from this pull request to 11.5 to address #6097. From there, the changes were merged to 12.2 and main.

Thank you, @mondrake and @joteejotee, for working on this!