RFR: Initial section on testing [v9]

[Igor Ignatyev]

On Mon, 26 Oct 2020 20:48:07 GMT, Igor Ignatyev <iignatyev at openjdk.org> wrote:

>> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Added note about TEST.properties
>
> Marked as reviewed by iignatyev (no project role).

it would appear that when I was talking about version-dependent text, I was mostly talking about this particular section( `testing`), and most of that was suggested by me. so if there is someone to blame for having version-specific text in the guide, that would be me �� in any event, I believe this patch is good enough to be integrated, we can identify and fix/clarify version dependent parts later.

-- Igor

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PR: https://git.openjdk.java.net/guide/pull/30