Fiber loops in Renderer and BigPipe are never suspended

3 Patches with only fix, only test and both.

The test is only for BigPipe
@catch said ( https://www.drupal.org/project/drupal/issues/3377570#comment-15271705 📌 Add PHP Fibers support to BigPipe RTBC ) that it is not testable, and I've never written tests before, so I'm unsure how bad is it.
I could look at a separate test for Renderer if needed.

I take my words back, looks like it is testable after all and that's a nice test.

Only thing I might consider is defining the class with the lazy builder callback in the unit test itself (i.e. just defining the class at the bottom of the file alongside the test class), rather than putting it in the big pipe module controller which is more for functional tests.

The last submitted patch, 2: 3394062-fibers-suspend-loop-test.patch, failed testing. View results →

Done
Moved the lazy builder callback to the unit test file in MR5009

Leaning on test-only fail in #2 to show this issue.

Pointer from @catch in #4, from my understanding, has been addressed.

Think this is good to move ahead.

Committed/pushed to 11.x and cherry-picked back to 10.2.x, thanks!

Automatically closed - issue fixed for 2 weeks with no activity.