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Subject [GitHub] [lucenenet] NightOwl888 commented on pull request #313: Fix/random seed simple
Date Tue, 21 Jul 2020 12:55:47 GMT

NightOwl888 commented on pull request #313:

   Its a bit strange, but although this seems to have fixed the `TestRandomStrings` tests
for `TestICUFoldingFilter` and `TestThaiAnalyzer`, the `TestThaiAnalzyer::TestRandomHugeStrings()`
test still fails. But digging into it, they both terminate in the same place, the only difference
is the `maxWordLength` parameter is increased.
   I suspect we may have a difference in behavior somewhere in `TestUtil.RandomAnalysisString(Random,
int, bool)` that may be causing some rare weirdness. Sadly, `TestUtil` has no tests to verify
the behavior is doing what it should be doing.
   `TestUtil.RandomAnalysisString()` is also called by `Lucene.Net.Analysis.NGram.EdgeNGramTokenizerTest::TestFullUTF8Range()`
and `Lucene.Net.Analysis.NGram.NGramTokenizerTest::TestFullUTF8Range()`, both which are also
randomly failing. Perhaps one of the paths that `TestUtil.RandomSubString()` is going down
is broken, which would explain the randomness. I suggest to divide and conquer - keep excluding
the random paths until you find the one that causes the failure to stop happening. That would
probably be a bit quicker than reviewing every one of those methods and comparing them against
the Java implementation.

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