[ruby-core:31604] Re: [Backport #3646] bootstraptests/test_io.rb -- timing issue.

On 2 Aug 2010, at 21:56, Christian Htje wrote:

> Backport #3646: bootstraptests/test_io.rb -- timing issue.
> http://redmine.ruby-lang.org/issues/show/3646
> 
> Author: Christian Htje
> Status: Open, Priority: Normal
> 
> What happened:
> I built ruby 1.9.1-p378 on 5 boxes (linux-32, linux-65, Solaris 8 (sparc64), windows-32 and windows-64.
> Windows is built with MSVC8.
> Only on the windows-32 box does ruby have an error in btests-ruby, in the 3rd test in test_io.rb.
> 
> It doesn't happen when running the test alone, but only when running all the tests prior to it. I was able to fix it by changing the test to `sleep 1` after the thread and changing assert_finish to wait for 2 seconds instead of one:
> assert_finish 2, %q{
>  r, w = IO.pipe
>  Thread.new {
>  w << "ab"
>  sleep 0.1
>  w << "ab"
>  }
>  sleep 1
>  r.gets("abab")
> }

I'm not sure what this is supposed to be testing exactly, but, it might be better as:

assert_finish 2, %q{
  r, w = IO.pipe
  Thread.new {
    w << 'ab'
    sleep 0.1
    w << 'ab'
  }.join(1)
  r.gets("abab")
}

Unless this violates the nature of the test.