RFR: 8264512: jdk/test/jdk/java/util/prefs/ExportNode.java relies on default platform encoding

[Naoto Sato]

On Fri, 2 Apr 2021 21:45:58 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

> This test emits to a `java.io.ByteArrayOutputStream` the contents of a `java.utils.prefs.Preferences` node. The `UTF-8` character encoding is used [1]. The `ByteArrayOutputStream` is then converted to a `String` using `toString()` which uses the platform's default character set [2]. The resulting `String` is then checked for the node names that it should and should not contain.
> 
> This change proposes to use `ByteArrayOutputStream.toString(String)` to obtain the string [3] to maintain consistency of the encoding. It also adds throwing a `RuntimeException` if the node string is not as expected. It is unclear why this test was not already throwing such an exception.
> 
> [1] https://docs.oracle.com/en/java/javase/16/docs/api/java.prefs/java/util/prefs/Preferences.html#exportNode(java.io.OutputStream)
> [2] https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/io/ByteArrayOutputStream.html#toString()
> [3] https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/io/ByteArrayOutputStream.html#toString(java.lang.String)

Looks good.

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Marked as reviewed by naoto (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/3332