RFR: 7903953: Use scratch directory for JUnit's TempDir annotation [v2]

[Jaikiran Pai]

On Mon, 24 Feb 2025 11:28:44 GMT, Christian Stein <cstein at openjdk.org> wrote:

>> The assertion(s) in the test only make sense, when `jtreg` runs the test via its `JUnitRunner`. The `test.name` system property is an indicator that `jtreg` runs the test, I could switch to another one documented here: https://openjdk.org/jtreg/tag-spec.html#testvars
>
> Perhaps it would be better to replace this non-obvious declarative guard with a programmatic `Assumptions....` statement within the test method. 🤔

> The assertion(s) in the test only make sense, when jtreg runs the test via its JUnitRunner.

Since this is a self test in the jtreg project, would it be the case that a test marked as `@run junit` will always be run by the `JUnitRunner`? So even the assumption I think is probably isn't needed.

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PR Review Comment: https://git.openjdk.org/jtreg/pull/248#discussion_r1969125262