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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2449) Improve random testing
Date Thu, 06 May 2010 17:44:49 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2449?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12864855#action_12864855
] 

Robert Muir commented on LUCENE-2449:
-------------------------------------

I ran the patch with -Drandom.multiplier=23
The tests spun and spun (i finally killed it), but i produced a few failures. Hopefully they
are all just bugs I introduced into the tests!

After 2 minutes, TestIW failed here:
{noformat}
    [junit] Testsuite: org.apache.lucene.index.TestIndexWriter
    [junit] Testcase: testTermUTF16SortOrder(org.apache.lucene.index.TestIndexWriter):  FAILED
    [junit] null
    [junit] junit.framework.AssertionFailedError
    [junit]     at org.apache.lucene.index.codecs.standard.StandardTermsDictReader$FieldReader$SegmentTermsEnum.seek(StandardTermsDictReader.java:377)
    [junit]     at org.apache.lucene.index.MultiTermsEnum.seek(MultiTermsEnum.java:143)
    [junit]     at org.apache.lucene.index.TermsEnum.seek(TermsEnum.java:68)
    [junit]     at org.apache.lucene.index.TestIndexWriter.checkTermsOrder(TestIndexWriter.java:4717)
    [junit]     at org.apache.lucene.index.TestIndexWriter.testTermUTF16SortOrder(TestIndexWriter.java:4789)
    [junit]     at org.apache.lucene.util.LuceneTestCase.runBare(LuceneTestCase.java:276)
    [junit]
    [junit]
    [junit] Tests run: 112, Failures: 1, Errors: 0, Time elapsed: 143.461 sec
    [junit] ------------- Standard Output ---------------
    [junit] NOTE: random seed of testcase 'testTermUTF16SortOrder' was: 1356727775332805472
{noformat}

All NRQ tests failed, i must have screwed up the tests really bad
{noformat}
    [junit] Testsuite: org.apache.lucene.search.TestMultiValuedNumericRangeQuery
    [junit] Testcase: testMultiValuedNRQ(org.apache.lucene.search.TestMultiValuedNumericRangeQuery):
   FAILED
    [junit] null
    [junit] junit.framework.AssertionFailedError
    [junit]     at org.apache.lucene.index.codecs.standard.StandardTermsDictReader$FieldReader$SegmentTermsEnum.seek(StandardTermsDictReader.java:377)
    [junit]     at org.apache.lucene.index.TermsEnum.seek(TermsEnum.java:68)
    [junit]     at org.apache.lucene.index.Terms.docFreq(Terms.java:53)
    [junit]     at org.apache.lucene.index.SegmentReader.docFreq(SegmentReader.java:935)
    [junit]     at org.apache.lucene.index.DirectoryReader.docFreq(DirectoryReader.java:724)
    [junit]     at org.apache.lucene.search.MultiTermQuery$ConstantScoreAutoRewrite$CutOffTermCollector.collect(MultiTermQuery.java:609)
    [junit]     at org.apache.lucene.search.MultiTermQuery$BooleanQueryRewrite.collectTerms(MultiTermQuery.java:223)
    [junit]     at org.apache.lucene.search.MultiTermQuery$ConstantScoreAutoRewrite.rewrite(MultiTermQuery.java:568)
    [junit]     at org.apache.lucene.search.MultiTermQuery.rewrite(MultiTermQuery.java:755)
    [junit]     at org.apache.lucene.search.IndexSearcher.rewrite(IndexSearcher.java:270)
    [junit]     at org.apache.lucene.search.Query.weight(Query.java:100)
    [junit]     at org.apache.lucene.search.Searcher.createWeight(Searcher.java:147)
    [junit]     at org.apache.lucene.search.Searcher.search(Searcher.java:98)
    [junit]     at org.apache.lucene.search.Searcher.search(Searcher.java:108)
    [junit]     at org.apache.lucene.search.TestMultiValuedNumericRangeQuery.testMultiValuedNRQ(TestMultiValuedNumericRangeQuery.java:72)
    [junit]     at org.apache.lucene.util.LuceneTestCase.runBare(LuceneTestCase.java:276)
    [junit]
    [junit]
    [junit] Tests run: 1, Failures: 1, Errors: 0, Time elapsed: 74.553 sec
    [junit]
    [junit] ------------- Standard Output ---------------
    [junit] NOTE: random seed of testcase 'testMultiValuedNRQ' was: 6379316497871210234
    [junit] ------------- ---------------- ---------------

    [junit] Testsuite: org.apache.lucene.search.TestNumericRangeQuery64
    [junit] Testcase: testRandomTrieAndClassicRangeQuery_6bit(org.apache.lucene.search.TestNumericRangeQuery64):FAILED
    [junit] null
    [junit] junit.framework.AssertionFailedError
    [junit]     at org.apache.lucene.index.codecs.standard.StandardTermsDictReader$FieldReader$SegmentTermsEnum.seek(StandardTermsDictReader.java:377)
    [junit]     at org.apache.lucene.index.TermsEnum.seek(TermsEnum.java:68)
    [junit]     at org.apache.lucene.index.Terms.docFreq(Terms.java:53)
    [junit]     at org.apache.lucene.index.SegmentReader.docFreq(SegmentReader.java:935)
    [junit]     at org.apache.lucene.index.DirectoryReader.docFreq(DirectoryReader.java:724)
    [junit]     at org.apache.lucene.search.MultiTermQuery$ConstantScoreAutoRewrite$CutOffTermCollector.collect(MultiTermQuery.java:609)
    [junit]     at org.apache.lucene.search.MultiTermQuery$BooleanQueryRewrite.collectTerms(MultiTermQuery.java:223)
    [junit]     at org.apache.lucene.search.MultiTermQuery$ConstantScoreAutoRewrite.rewrite(MultiTermQuery.java:568)
    [junit]     at org.apache.lucene.search.MultiTermQuery.rewrite(MultiTermQuery.java:755)
    [junit]     at org.apache.lucene.search.IndexSearcher.rewrite(IndexSearcher.java:270)
    [junit]     at org.apache.lucene.search.Query.weight(Query.java:100)
    [junit]     at org.apache.lucene.search.Searcher.createWeight(Searcher.java:147)
    [junit]     at org.apache.lucene.search.Searcher.search(Searcher.java:98)
    [junit]     at org.apache.lucene.search.Searcher.search(Searcher.java:108)
    [junit]     at org.apache.lucene.search.TestNumericRangeQuery64.testRandomTrieAndClassicRangeQuery(TestNumericRangeQuery64.java:364)
    [junit]     at org.apache.lucene.search.TestNumericRangeQuery64.testRandomTrieAndClassicRangeQuery_6bit(TestNumericRangeQuery64.java:410)
    [junit]
    [junit]
    [junit] Testcase: testSorting_6bit(org.apache.lucene.search.TestNumericRangeQuery64):
      FAILED
    [junit] null
    [junit] junit.framework.AssertionFailedError
    [junit]     at org.apache.lucene.index.codecs.standard.StandardTermsDictReader$FieldReader$SegmentTermsEnum.seek(StandardTermsDictReader.java:377)
    [junit]     at org.apache.lucene.index.TermsEnum.seek(TermsEnum.java:68)
    [junit]     at org.apache.lucene.index.Terms.docFreq(Terms.java:53)
    [junit]     at org.apache.lucene.index.SegmentReader.docFreq(SegmentReader.java:935)
    [junit]     at org.apache.lucene.index.DirectoryReader.docFreq(DirectoryReader.java:724)
    [junit]     at org.apache.lucene.search.MultiTermQuery$ConstantScoreAutoRewrite$CutOffTermCollector.collect(MultiTermQuery.java:609)
    [junit]     at org.apache.lucene.search.MultiTermQuery$BooleanQueryRewrite.collectTerms(MultiTermQuery.java:223)
    [junit]     at org.apache.lucene.search.MultiTermQuery$ConstantScoreAutoRewrite.rewrite(MultiTermQuery.java:568)
    [junit]     at org.apache.lucene.search.MultiTermQuery.rewrite(MultiTermQuery.java:755)
    [junit]     at org.apache.lucene.search.IndexSearcher.rewrite(IndexSearcher.java:270)
    [junit]     at org.apache.lucene.search.Query.weight(Query.java:100)
    [junit]     at org.apache.lucene.search.Searcher.createWeight(Searcher.java:147)
    [junit]     at org.apache.lucene.search.Searcher.search(Searcher.java:49)
    [junit]     at org.apache.lucene.search.TestNumericRangeQuery64.testSorting(TestNumericRangeQuery64.java:525)
    [junit]     at org.apache.lucene.search.TestNumericRangeQuery64.testSorting_6bit(TestNumericRangeQuery64.java:545)
    [junit]
    [junit]
    [junit] Tests run: 34, Failures: 2, Errors: 0, Time elapsed: 544.22 sec
    [junit]
    [junit] ------------- Standard Output ---------------
    [junit] NOTE: random seed of testcase 'testRandomTrieAndClassicRangeQuery_6bit' was: 3692414376588312592
    [junit] NOTE: random seed of testcase 'testSorting_6bit' was: -5115416782250700412
    [junit] ------------- ---------------- ---------------

    [junit] Testsuite: org.apache.lucene.search.TestNumericRangeQuery32
    [junit] Testcase: testRandomTrieAndClassicRangeQuery_4bit(org.apache.lucene.search.TestNumericRangeQuery32):FAILED
    [junit] null
    [junit] junit.framework.AssertionFailedError
    [junit]     at org.apache.lucene.index.codecs.standard.StandardTermsDictReader$FieldReader$SegmentTermsEnum.seek(StandardTermsDictReader.java:377)
    [junit]     at org.apache.lucene.index.TermsEnum.seek(TermsEnum.java:68)
    [junit]     at org.apache.lucene.index.Terms.docFreq(Terms.java:53)
    [junit]     at org.apache.lucene.index.SegmentReader.docFreq(SegmentReader.java:935)
    [junit]     at org.apache.lucene.index.DirectoryReader.docFreq(DirectoryReader.java:724)
    [junit]     at org.apache.lucene.search.MultiTermQuery$ConstantScoreAutoRewrite$CutOffTermCollector.collect(MultiTermQuery.java:609)
    [junit]     at org.apache.lucene.search.MultiTermQuery$BooleanQueryRewrite.collectTerms(MultiTermQuery.java:223)
    [junit]     at org.apache.lucene.search.MultiTermQuery$ConstantScoreAutoRewrite.rewrite(MultiTermQuery.java:568)
    [junit]     at org.apache.lucene.search.MultiTermQuery.rewrite(MultiTermQuery.java:755)
    [junit]     at org.apache.lucene.search.IndexSearcher.rewrite(IndexSearcher.java:270)
    [junit]     at org.apache.lucene.search.Query.weight(Query.java:100)
    [junit]     at org.apache.lucene.search.Searcher.createWeight(Searcher.java:147)
    [junit]     at org.apache.lucene.search.Searcher.search(Searcher.java:98)
    [junit]     at org.apache.lucene.search.Searcher.search(Searcher.java:108)
    [junit]     at org.apache.lucene.search.TestNumericRangeQuery32.testRandomTrieAndClassicRangeQuery(TestNumericRangeQuery32.java:346)
    [junit]     at org.apache.lucene.search.TestNumericRangeQuery32.testRandomTrieAndClassicRangeQuery_4bit(TestNumericRangeQuery32.java:392)
    [junit]
    [junit]
    [junit] Testcase: testRangeSplit_8bit(org.apache.lucene.search.TestNumericRangeQuery32):
   FAILED
    [junit] null
    [junit] junit.framework.AssertionFailedError
    [junit]     at org.apache.lucene.index.codecs.standard.StandardTermsDictReader$FieldReader$SegmentTermsEnum.seek(StandardTermsDictReader.java:377)
    [junit]     at org.apache.lucene.index.TermsEnum.seek(TermsEnum.java:68)
    [junit]     at org.apache.lucene.index.Terms.docFreq(Terms.java:53)
    [junit]     at org.apache.lucene.index.SegmentReader.docFreq(SegmentReader.java:935)
    [junit]     at org.apache.lucene.index.DirectoryReader.docFreq(DirectoryReader.java:724)
    [junit]     at org.apache.lucene.search.MultiTermQuery$ConstantScoreAutoRewrite$CutOffTermCollector.collect(MultiTermQuery.java:609)
    [junit]     at org.apache.lucene.search.MultiTermQuery$BooleanQueryRewrite.collectTerms(MultiTermQuery.java:223)
    [junit]     at org.apache.lucene.search.MultiTermQuery$ConstantScoreAutoRewrite.rewrite(MultiTermQuery.java:568)
    [junit]     at org.apache.lucene.search.MultiTermQuery.rewrite(MultiTermQuery.java:755)
    [junit]     at org.apache.lucene.search.IndexSearcher.rewrite(IndexSearcher.java:270)
    [junit]     at org.apache.lucene.search.Query.weight(Query.java:100)
    [junit]     at org.apache.lucene.search.Searcher.createWeight(Searcher.java:147)
    [junit]     at org.apache.lucene.search.Searcher.search(Searcher.java:98)
    [junit]     at org.apache.lucene.search.Searcher.search(Searcher.java:108)
    [junit]     at org.apache.lucene.search.TestNumericRangeQuery32.testRangeSplit(TestNumericRangeQuery32.java:421)
    [junit]     at org.apache.lucene.search.TestNumericRangeQuery32.testRangeSplit_8bit(TestNumericRangeQuery32.java:436)
    [junit]
    [junit]
    [junit] Testcase: testRangeSplit_2bit(org.apache.lucene.search.TestNumericRangeQuery32):
   FAILED
    [junit] null
    [junit] junit.framework.AssertionFailedError
    [junit]     at org.apache.lucene.index.codecs.standard.StandardTermsDictReader$FieldReader$SegmentTermsEnum.seek(StandardTermsDictReader.java:377)
    [junit]     at org.apache.lucene.index.TermsEnum.seek(TermsEnum.java:68)
    [junit]     at org.apache.lucene.index.Terms.docFreq(Terms.java:53)
    [junit]     at org.apache.lucene.index.SegmentReader.docFreq(SegmentReader.java:935)
    [junit]     at org.apache.lucene.index.DirectoryReader.docFreq(DirectoryReader.java:724)
    [junit]     at org.apache.lucene.search.MultiTermQuery$ConstantScoreAutoRewrite$CutOffTermCollector.collect(MultiTermQuery.java:609)
    [junit]     at org.apache.lucene.search.MultiTermQuery$BooleanQueryRewrite.collectTerms(MultiTermQuery.java:223)
    [junit]     at org.apache.lucene.search.MultiTermQuery$ConstantScoreAutoRewrite.rewrite(MultiTermQuery.java:568)
    [junit]     at org.apache.lucene.search.MultiTermQuery.rewrite(MultiTermQuery.java:755)
    [junit]     at org.apache.lucene.search.IndexSearcher.rewrite(IndexSearcher.java:270)
    [junit]     at org.apache.lucene.search.Query.weight(Query.java:100)
    [junit]     at org.apache.lucene.search.Searcher.createWeight(Searcher.java:147)
    [junit]     at org.apache.lucene.search.Searcher.search(Searcher.java:98)
    [junit]     at org.apache.lucene.search.Searcher.search(Searcher.java:108)
    [junit]     at org.apache.lucene.search.TestNumericRangeQuery32.testRangeSplit(TestNumericRangeQuery32.java:417)
    [junit]     at org.apache.lucene.search.TestNumericRangeQuery32.testRangeSplit_2bit(TestNumericRangeQuery32.java:446)
    [junit]
    [junit]
    [junit] Testcase: testSorting_8bit(org.apache.lucene.search.TestNumericRangeQuery32):
      FAILED
    [junit] null
    [junit] junit.framework.AssertionFailedError
    [junit]     at org.apache.lucene.index.codecs.standard.StandardTermsDictReader$FieldReader$SegmentTermsEnum.seek(StandardTermsDictReader.java:377)
    [junit]     at org.apache.lucene.index.TermsEnum.seek(TermsEnum.java:68)
    [junit]     at org.apache.lucene.index.Terms.docFreq(Terms.java:53)
    [junit]     at org.apache.lucene.index.SegmentReader.docFreq(SegmentReader.java:935)
    [junit]     at org.apache.lucene.index.DirectoryReader.docFreq(DirectoryReader.java:724)
    [junit]     at org.apache.lucene.search.MultiTermQuery$ConstantScoreAutoRewrite$CutOffTermCollector.collect(MultiTermQuery.java:609)
    [junit]     at org.apache.lucene.search.MultiTermQuery$BooleanQueryRewrite.collectTerms(MultiTermQuery.java:223)
    [junit]     at org.apache.lucene.search.MultiTermQuery$ConstantScoreAutoRewrite.rewrite(MultiTermQuery.java:568)
    [junit]     at org.apache.lucene.search.MultiTermQuery.rewrite(MultiTermQuery.java:755)
    [junit]     at org.apache.lucene.search.IndexSearcher.rewrite(IndexSearcher.java:270)
    [junit]     at org.apache.lucene.search.Query.weight(Query.java:100)
    [junit]     at org.apache.lucene.search.Searcher.createWeight(Searcher.java:147)
    [junit]     at org.apache.lucene.search.Searcher.search(Searcher.java:49)
    [junit]     at org.apache.lucene.search.TestNumericRangeQuery32.testSorting(TestNumericRangeQuery32.java:492)
    [junit]     at org.apache.lucene.search.TestNumericRangeQuery32.testSorting_8bit(TestNumericRangeQuery32.java:507)
    [junit]
    [junit]
    [junit] Testcase: testSorting_4bit(org.apache.lucene.search.TestNumericRangeQuery32):
      FAILED
    [junit] null
    [junit] junit.framework.AssertionFailedError
    [junit]     at org.apache.lucene.index.codecs.standard.StandardTermsDictReader$FieldReader$SegmentTermsEnum.seek(StandardTermsDictReader.java:377)
    [junit]     at org.apache.lucene.index.TermsEnum.seek(TermsEnum.java:68)
    [junit]     at org.apache.lucene.index.Terms.docFreq(Terms.java:53)
    [junit]     at org.apache.lucene.index.SegmentReader.docFreq(SegmentReader.java:935)
    [junit]     at org.apache.lucene.index.DirectoryReader.docFreq(DirectoryReader.java:724)
    [junit]     at org.apache.lucene.search.MultiTermQuery$ConstantScoreAutoRewrite$CutOffTermCollector.collect(MultiTermQuery.java:609)
    [junit]     at org.apache.lucene.search.MultiTermQuery$BooleanQueryRewrite.collectTerms(MultiTermQuery.java:223)
    [junit]     at org.apache.lucene.search.MultiTermQuery$ConstantScoreAutoRewrite.rewrite(MultiTermQuery.java:568)
    [junit]     at org.apache.lucene.search.MultiTermQuery.rewrite(MultiTermQuery.java:755)
    [junit]     at org.apache.lucene.search.IndexSearcher.rewrite(IndexSearcher.java:270)
    [junit]     at org.apache.lucene.search.Query.weight(Query.java:100)
    [junit]     at org.apache.lucene.search.Searcher.createWeight(Searcher.java:147)
    [junit]     at org.apache.lucene.search.Searcher.search(Searcher.java:49)
    [junit]     at org.apache.lucene.search.TestNumericRangeQuery32.testSorting(TestNumericRangeQuery32.java:492)
    [junit]     at org.apache.lucene.search.TestNumericRangeQuery32.testSorting_4bit(TestNumericRangeQuery32.java:512)
    [junit]
    [junit]
    [junit] Tests run: 27, Failures: 5, Errors: 0, Time elapsed: 332.621 sec
    [junit]
    [junit] ------------- Standard Output ---------------
    [junit] NOTE: random seed of testcase 'testRandomTrieAndClassicRangeQuery_4bit' was: -2669854942242274524
    [junit] NOTE: random seed of testcase 'testRangeSplit_8bit' was: 5368342330535968370
    [junit] NOTE: random seed of testcase 'testRangeSplit_2bit' was: 4707437135047159199
    [junit] NOTE: random seed of testcase 'testSorting_8bit' was: 4999254898192507629
    [junit] NOTE: random seed of testcase 'testSorting_4bit' was: 3362223988444615041
    [junit] ------------- ---------------- ---------------

{noformat}

TestRegexpRandom2 failed

{noformat}
    [junit] Testsuite: org.apache.lucene.search.TestRegexpRandom2
    [junit] Testcase: testRegexps(org.apache.lucene.search.TestRegexpRandom2):  FAILED
    [junit] for re:. expected:<2808> but was:<2801>
    [junit] junit.framework.AssertionFailedError: for re:. expected:<2808> but was:<2801>
    [junit]     at org.apache.lucene.search.TestRegexpRandom2.assertSame(TestRegexpRandom2.java:138)
    [junit]     at org.apache.lucene.search.TestRegexpRandom2.testRegexps(TestRegexpRandom2.java:117)
    [junit]     at org.apache.lucene.util.LuceneTestCase.runBare(LuceneTestCase.java:276)
    [junit]
    [junit]
    [junit] Tests run: 1, Failures: 1, Errors: 0, Time elapsed: 125.146 sec
    [junit]
    [junit] ------------- Standard Output ---------------
    [junit] NOTE: random seed of testcase 'testRegexps' was: 8221008363438780882
    [junit] ------------- ---------------- ---------------
{noformat}

The automaton convertor failed, probably some illegal surrogate case

{noformat}
    [junit] Testsuite: org.apache.lucene.util.automaton.TestUTF32ToUTF8
    [junit] Testcase: testRandomRegexes(org.apache.lucene.util.automaton.TestUTF32ToUTF8):
     Caused an ERROR
    [junit] 2361
    [junit] java.lang.ArrayIndexOutOfBoundsException: 2361
    [junit]     at java.lang.Character.toSurrogates(Character.java:2596)
    [junit]     at java.lang.String.<init>(String.java:275)
    [junit]     at org.apache.lucene.util.automaton.TestUTF32ToUTF8.assertAutomaton(TestUTF32ToUTF8.java:186)
    [junit]     at org.apache.lucene.util.automaton.TestUTF32ToUTF8.testRandomRegexes(TestUTF32ToUTF8.java:170)
    [junit]     at org.apache.lucene.util.LuceneTestCase.runBare(LuceneTestCase.java:276)
    [junit]
    [junit]
    [junit] Tests run: 5, Failures: 0, Errors: 1, Time elapsed: 14.099 sec
    [junit]
    [junit] ------------- Standard Output ---------------
    [junit] NOTE: random seed of testcase 'testRandomRegexes' was: -6824078967033722523
    [junit] ------------- ---------------- ---------------
{noformat}

for TestDeterminizeLexicon, it just ran out of memory (we should probably put a Math.min on
lexicon size, no matter the multiplier)

{noformat}
    [junit] Testsuite: org.apache.lucene.util.automaton.TestDeterminizeLexicon
    [junit] Testcase: testLexicon(org.apache.lucene.util.automaton.TestDeterminizeLexicon):
    Caused an ERROR
    [junit] Java heap space
    [junit] java.lang.OutOfMemoryError: Java heap space
    [junit]     at org.apache.lucene.util.automaton.UTF32ToUTF8.newUTF8State(UTF32ToUTF8.java:302)
    [junit]     at org.apache.lucene.util.automaton.UTF32ToUTF8.convert(UTF32ToUTF8.java:285)
    [junit]     at org.apache.lucene.util.automaton.ByteRunAutomaton.<init>(ByteRunAutomaton.java:23)
    [junit]     at org.apache.lucene.util.automaton.TestDeterminizeLexicon.assertLexicon(TestDeterminizeLexicon.java:63)
    [junit]     at org.apache.lucene.util.automaton.TestDeterminizeLexicon.testLexicon(TestDeterminizeLexicon.java:51)
    [junit]     at org.apache.lucene.util.LuceneTestCase.runBare(LuceneTestCase.java:276)
    [junit]
    [junit]
    [junit] Tests run: 1, Failures: 0, Errors: 1, Time elapsed: 33.064 sec
    [junit]
    [junit] ------------- Standard Output ---------------
    [junit] NOTE: random seed of testcase 'testLexicon' was: 2016020851907753137
    [junit] ------------- ---------------- ---------------
{noformat}


> Improve random testing
> ----------------------
>
>                 Key: LUCENE-2449
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2449
>             Project: Lucene - Java
>          Issue Type: Test
>          Components: Build
>            Reporter: Robert Muir
>            Priority: Minor
>         Attachments: LUCENE-2449.patch, LUCENE-2449.patch
>
>
> We have quite a few random tests, but there's no way to "crank" them.
> The idea here is to add a multiplier which can be increased by a sysprop. For example,
we could set this to something higher than 1 for hudson.

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