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https://issues.apache.org/jira/browse/LUCENE-6072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14222526#comment-14222526
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Uwe Schindler commented on LUCENE-6072:
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One small thing: Should FilterFSProver.onClose not be protected instead of
public?
> Use mock filesystem in tests
> ----------------------------
>
> Key: LUCENE-6072
> URL: https://issues.apache.org/jira/browse/LUCENE-6072
> Project: Lucene - Core
> Issue Type: Test
> Reporter: Robert Muir
> Attachments: LUCENE-6072.patch, LUCENE-6072.patch, LUCENE-6072.patch
>
>
> We went through the trouble to convert to NIO.2, but we don't take advantage
> of it in tests...
> Since everything boils down to LuceneTestCase's temp dir (which is just
> Path), we can wrap the filesystem with useful stuff:
> * detect file handle leaks (better than mockdir: not just index files)
> * act like windows (don't delete open files, case-insensitivity, etc)
> * verbosity (add what is going on to infostream for debugging)
> I prototyped some of this in a patch. Currently it makes a chain like this:
> {code}
> private FileSystem initializeFileSystem() {
> FileSystem fs = FileSystems.getDefault();
> if (LuceneTestCase.VERBOSE) {
> fs = new VerboseFS(fs,
> new PrintStreamInfoStream(System.out)).getFileSystem(null);
> }
> fs = new LeakFS(fs).getFileSystem(null);
> fs = new WindowsFS(fs).getFileSystem(null);
> return fs.provider().getFileSystem(URI.create("file:///"));
> }
> {code}
> Some things to figure out:
> * I don't think we want to wrap all the time (worry about hiding bugs)
> * its currently a bit lenient (e.g. these filesystems allow calling toFile,
> which can "escape" and allow you to do broken things). But only 2 or 3 tests
> really need File, so we could fix that.
> * its currently complicated and messy (i blame the jdk api here, but maybe we
> can simplify it)
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