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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