Summary

Hi 👋

When deprecations are encountered the SouceMapper recursively scans all files for each <source> include and exclude paths.

This causes a siginficant pause in PHPUnit as it scans all these files, initially for 16 seconds until we isolated the issue and refined the <source> list - now it's "only" 3 seconds.

Current behavior

Scans all files when a deprecation is encountered.

How to reproduce

Add a <source> configuration:

 <source> <include> <directory suffix=".php">src/</directory> <directory suffix=".php">perhaps-another-directory-here/</directory> </include> <exclude> <directory suffix=".php">src/SubFolder</directory> <!-- maybe serveral more here --> </exclude> </source> 

• Run a test that would trigger a deprecation
• Observe that source mapper will recursively iterate over all the files in the above paths.

https://github.com/sebastianbergmann/phpunit/blob/main/src/Runner/ErrorHandler.php#L178

Expected behavior

That a triggered deprecation would not scan all the files and block the test run for N seconds.