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https://issues.apache.org/jira/browse/LUCENE-5622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13976657#comment-13976657
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Robert Muir commented on LUCENE-5622:
-------------------------------------

Maybe you will hate it, but we need it to be practical. tests.verbose is too 
much, it hides test failures.

For example if you turned it on, the test in LUCENE-5623 would never fail, 
because it hides concurrency issues. 

I know you may not like that we have to resort to such shellscripts etc, but I 
can assure you its necessary :)

> Fail tests if they print, and tests.verbose is not set
> ------------------------------------------------------
>
>                 Key: LUCENE-5622
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5622
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>            Assignee: Dawid Weiss
>         Attachments: LUCENE-5622.patch, LUCENE-5622.patch, LUCENE-5622.patch
>
>
> Some tests print so much stuff they are now undebuggable (see LUCENE-5612).
> I think its bad that the testrunner hides this stuff, we used to stay on top 
> of it. Instead, whne tests.verbose is false, we should install a printstreams 
> (system.out/err) that fail the test instantly because they are noisy. 
> This will ensure that our tests don't go out of control.



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