Flaky test in ./spec/parallel_spec.rb:478

[dleidert]

Hi,

we observe random test failures at the same place in your tests. I actually wasn't able to reproduce them locally, but our build-daemons and CI pipelines show them:

Failures:
  1) Parallel.map sets Parallel.worker_number when run with isolation
     Failure/Error: out.should == "0,1\nOK"
       expected: "0,1\nOK"
            got: "0,1\nFAIL: before:18 -- after:17" (using ==)
       Diff:
       @@ -1,3 +1,3 @@
        0,1
       -OK
       +FAIL: before:18 -- after:17
     # ./spec/parallel_spec.rb:478:in `block (3 levels) in <top (required)>'
     # ./spec/spec_helper.rb:9:in `block (2 levels) in <top (required)>'

https://bugs.debian.org/996346
https://salsa.debian.org/ruby-team/ruby-parallel/-/jobs/2187476#L1724
https://salsa.debian.org/ruby-team/ruby-parallel/-/jobs/2187472#L1677

Maybe you can improve the stability of this test? It seems you have experienced problems with it on travis as well.