Create helper to mock iterators

Think we should include least one conversion spot where this could be useful

Added one.

Converting an existing test is problematic: migrate tests are suitable but those are prophecy. My bad: when we added them (more than a decade ago, mind you) prophecy was fresh and it seemed to be the future. It seems by now this didn't turn out to be the case.

Left some small comments.

I simply refuse to add more bloat. But, if it's required, I can just won't fix this, it's not so important.

I've addressed the feedback on the MR.

LGTM

Committed a8d4ed9 and pushed to 11.x. Thanks!

As a new feature in the test framework this isn't eligible for backport to 11.2.x and I'm not sure it's worth copying to 10.6.x either, please reopen if you disagree.

longwave → closed merge request !11892

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