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https://issues.apache.org/jira/browse/LUCENE-5896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14104441#comment-14104441
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Robert Muir commented on LUCENE-5896:
-------------------------------------

Dawid: well this is exactly what i mean. We got ourselves into the situation 
long before that, when there was just a huge pile of code in 
LuceneTestCase.java, and I think a lot of that stuff is just hanging around, we 
should try to think of a way to do it better...

> A few potential reproducible issues
> -----------------------------------
>
>                 Key: LUCENE-5896
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5896
>             Project: Lucene - Core
>          Issue Type: Test
>          Components: general/test
>    Affects Versions: 4.9
>            Reporter: Simon Willnauer
>             Fix For: 5.0, 4.10
>
>         Attachments: LUCENE-5896.patch
>
>
> I realized that passing the same seeded random instance to LuceneTestCase# 
> newIndewWriterConfig doesn't necessarily produce the same IWC and I found a 
> bunch of issues in that class using global random rather than local random. 
> Yet, I went over the file to spot others but we might need to think about a 
> more automated way to spot those...



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