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https://issues.apache.org/jira/browse/LUCENE-2804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12968737#action_12968737
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Shai Erera commented on LUCENE-2804:
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Started to go over the tests, and I think that newDirectory(File) could be
useful to return any of the FSDirectory impls, over that File, and not copy it
to a random directory. Tests like LockFactory stress tests etc need to work on
a FSDirectory impl so either we make sure the test runs on all of them, or we
introduce newDirectory(File) which draws one of the FSDirs.
> check all tests that use FSDirectory.open
> -----------------------------------------
>
> Key: LUCENE-2804
> URL: https://issues.apache.org/jira/browse/LUCENE-2804
> Project: Lucene - Java
> Issue Type: Test
> Reporter: Robert Muir
>
> In LUCENE-2471 we were discussing the copyBytes issue, and Shai and I had a
> discussion about how we could prevent such bugs in the future.
> One thing that lead to the bug existing in our code for so long, was that it
> only happened on windows (e.g. never failed in hudson!)
> This was because the bug only happened if you were copying from
> SimpleFSDirectory, and the test used FSDirectory.open
> Today the situation is improving: most tests use newDirectory() which is
> random by default and never use FSDir.open,
> it always uses SimpleFS or NIOFS so that the same random seed will reproduce
> across both windows and unix.
> So I think we need to review all uses of FSDirectory.open in our tests, and
> minimize these.
> In general tests should use newDirectory().
> If the test comes with say a zip-file and wants to explicitly open stuff from
> disk, I think it should open the contents with say SimpleFSDir,
> and then call newDirectory(Directory) to copy into a new "random"
> implementation for actual testing. This method already exists:
> {noformat}
> /**
> * Returns a new Dictionary instance, with contents copied from the
> * provided directory. See {...@link #newDirectory()} for more
> * information.
> */
> public static MockDirectoryWrapper newDirectory(Directory d) throws
> IOException {
> {noformat}
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