RFR: 8368846: java/io/File/createTempFile/TargetDirectory fails when run by root user

Mon Sep 29 08:35:35 UTC 2025

The test checks whether writing to a read-only directory throws a `IOException`. This test is not applicable when the user running the test is root. Thus, I propose to skip it.

I converted the class to several JUnit tests, so we can use `@DisabledIf`.

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Commit messages:
 - nn
 - cc
 - convert to junit and skip

Changes: https://git.openjdk.org/jdk/pull/27542/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27542&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8368846
  Stats: 50 lines in 1 file changed: 16 ins; 10 del; 24 mod
  Patch: https://git.openjdk.org/jdk/pull/27542.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27542/head:pull/27542

PR: https://git.openjdk.org/jdk/pull/27542