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https://issues.apache.org/jira/browse/LUCENE-2598?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless updated LUCENE-2598:
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    Attachment: LUCENE-2598.patch

Some more fixes to try to make tests run faster w/ 
-Dtests.directory=SimpleFSDir.

Also, I changed FSDir.length -- previously it first checked if the file exists 
and then checks the size.  I reversed this check, since presumably it's far 
more common that this method is called w/ a real (existing) file.  Only if 
length comes back as 0 do I then check if it exists.

> allow tests to use different Directory impls
> --------------------------------------------
>
>                 Key: LUCENE-2598
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2598
>             Project: Lucene - Java
>          Issue Type: Test
>          Components: Build
>    Affects Versions: 3.1, 4.0
>            Reporter: Robert Muir
>            Assignee: Robert Muir
>             Fix For: 3.1, 4.0
>
>         Attachments: LUCENE-2598.patch, LUCENE-2598.patch, LUCENE-2598.patch, 
> LUCENE-2598.patch, LUCENE-2598.patch
>
>
> Now that all tests use MockRAMDirectory instead of RAMDirectory, they are all 
> picky like windows and force our tests to
> close readers etc before closing the directory.
> I think we should do the following:
> # change new MockRAMDIrectory() in tests to .newDirectory(random)
> # LuceneTestCase[J4] tracks if all dirs are closed at tearDown and also 
> cleans up temp dirs like solr.
> # factor out the Mockish stuff from MockRAMDirectory into MockDirectoryWrapper
> # allow a -Dtests.directoryImpl or simpler to specify the default Directory 
> to use for tests: default being "random"
> i think theres a chance we might find some bugs that havent yet surfaced 
> because they are easier to trigger with FSDir
> Furthermore, this would be beneficial to Directory-implementors as they could 
> run the entire testsuite against their Directory impl, just like 
> codec-implementors can do now.

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