Simpletest can't handle namespaces when creating verbose output.

This is a windows issue because on Linux, creating a filename with a \ in it works fine.

The path is generated once in in simpletest_verbose() and once in WebTestBase::verbose().

simpletest_verbose() is only used within WebTestBase. I suggest we merge these two functions and replace \ in $class with _ or something like that.

Work for me !

This is the easiest fix for the given bug. Not sure if it makes sense to add a test here, we don't have any test coverage of verbose() yet at all. I'd vote for checking whether we can add test coverage in #1588132: Simpletest verbose output url generation should be centralized..

This also works for me bumping to major as it basically prevents tests being run in a meaningful way on windows

Looks good to me. Would have preferred single quotes (like everywhere else in Drupal), but I won't hold off a commit on that. If you can quickly tweak that and upload a new patch before this gets committed, even better.

Works for me, fine with not adding tests for this and great if we can add them in the other issue.