RFR: 8287008: Improve tests for thread dumps in JSON format

[Chris Plummer]

On Thu, 19 May 2022 09:38:06 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> This is a test-only change to add some test infrastructure and improve the testing of thread dumps in JSON format. The new tests added by JEP 425 for this thread dump format search the JSON text for strings but don't parse it completely.  These tests can be improved with a test class that parses the thread dump. The tests for JEP 428 like make use of the test infrastructure too.

I think  a short example dump would actually be easier to read alongside the code.

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PR: https://git.openjdk.java.net/jdk/pull/8784