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From "Robert Muir (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-3995) In LuceneTestCase.beforeClass, make a new random (also using the class hashcode) to vary defaults
Date Tue, 17 Apr 2012 20:29:22 GMT
In LuceneTestCase.beforeClass, make a new random (also using the class hashcode) to vary defaults
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                 Key: LUCENE-3995
                 URL: https://issues.apache.org/jira/browse/LUCENE-3995
             Project: Lucene - Java
          Issue Type: Improvement
          Components: general/test
    Affects Versions: 4.0
            Reporter: Robert Muir


In LuceneTestCase, we set many static defaults like:
* default codec
* default infostream impl
* default locale
* default timezone
* default similarity

Currently each test run gets a single seed for the run, which means for example across one
test run
every single test will have say, SimpleText + infostream=off + Locale=german + timezone=EDT
+ similarity=BM25

Because of that, we lose lots of basic mixed coverage across tests, and it also means the
unfortunate
individual who gets SimpleText or other slow options gets a REALLY SLOW test run, rather than
amortizing
this across all test runs.

We should at least make a new random (getRandom() ^ className.hashCode()) to fix this so it
works like before,
but unfortunately that only fixes it for LuceneTestCase.

Won't any subclasses that make random decisions in @BeforeClass (and we have many) still have
the same problem?
Maybe RandomizedRunner can instead be improved here?


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