RFR: 8272964: java/nio/file/Files/InterruptCopy.java fails with java.lang.RuntimeException: Copy was not interrupted

[Brian Burkhalter]

On Wed, 25 Aug 2021 23:37:50 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> In the interrupt case, if the copy does not throw an `IOException`, rather than using the copy duration versus a threshold as the criterion for failure, instead check whether the target file does **not** exist, and if it does not, then make the test fail as this would indicate that the copy was in fact interrupted but did not throw an exception in response.

Before this PR was created, this test had been run 700 times on each of four different platforms without any failures.

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PR: https://git.openjdk.java.net/jdk/pull/5260