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https://issues.apache.org/jira/browse/LUCENE-3717?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir resolved LUCENE-3717.
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Resolution: Fixed
> Add fake charfilter to BaseTokenStreamTestCase to find offsets bugs
> -------------------------------------------------------------------
>
> Key: LUCENE-3717
> URL: https://issues.apache.org/jira/browse/LUCENE-3717
> Project: Lucene - Java
> Issue Type: Task
> Reporter: Robert Muir
> Fix For: 3.6, 4.0
>
> Attachments: LUCENE-3717.patch, LUCENE-3717_more.patch,
> LUCENE-3717_ngram.patch
>
>
> Recently lots of issues have been fixed about broken offsets, but it would be
> nice to improve the
> test coverage and test that they work across the board (especially with
> charfilters).
> in BaseTokenStreamTestCase.checkRandomData, we can sometimes pass the
> analyzer a reader wrapped
> in a "MockCharFilter" (the one in the patch sometimes doubles characters). If
> the analyzer does
> not call correctOffsets or does incorrect "offset math" (LUCENE-3642, etc)
> then eventually
> this will create offsets and the test will fail.
> Other than tests bugs, this found 2 real bugs: ICUTokenizer did not call
> correctOffset() in its end(),
> and ThaiWordFilter did incorrect offset math.
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