RFR: 8164389: jdk.nio.zipfs.JarFileSystem does not completely traverse the versioned entries in a multi-release jar file

[Steve Drach]

>>> You might wanna create a temporary jar file if possible, just in case the test somehow fails to clean things up.
>> 
>> Unsure how to do that, or perhaps I don’t understand your request.
> 
> I believe it’s possible to create a temporary directory, see Files.createTempDirectory, and use that to place the test.jar, although it might be more awkward to clean up.
> 
> Actually maybe it’s ok with regards to test execution if you can confirm the “user.dir” is set up correctly with jtreg, i cannot recall.

It’s usually JTwork/scratch.  A lot of tests use user.dir.