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

[fandreuz]

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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• JDK-8368846: java/io/File/createTempFile/TargetDirectory fails when run by root user (Enhancement - P4)

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