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https://issues.apache.org/jira/browse/LUCENE-5645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14013433#comment-14013433
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Dawid Weiss commented on LUCENE-5645:
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> I'm still confused: since when was the empty string a supported value for
> 'tests.seed'?
It's been "supported" since the very beginning. A non-existent tests.seed or an
empty string are equivalent to the testing framework (and default to a randomly
picked seed).
You can override this in Lucene of course, but then you'll have to change
common-build to pass a propertyref instead of a property and it'll be more
complicated. Try it.
> StringHelper should check for empty string of "tests.seed" system property
> --------------------------------------------------------------------------
>
> Key: LUCENE-5645
> URL: https://issues.apache.org/jira/browse/LUCENE-5645
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 4.8, 5.0
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Minor
> Fix For: 4.8.1, 5.0
>
> Attachments: LUCENE-5645_StringHelper_empty_tests_seed_condition.patch
>
>
> As of LUCENE-5604 (committed to v4.8), StringHelper will initialize
> GOOD_FAST_HASH_SEED based on the system property "tests.seed" if it is set.
> Unfortunately it doesn't do an empty-string check, and it's common at least
> in my setup that copies Lucene's maven pom.xml that the string will be empty
> unless I set it on the command line. FWIW Randomized Testing does do an
> empty-string check.
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