RFR: JDK-8296240: Augment discussion of test tiers in doc/testing.md [v5]

[Leonid Mesnik]

On Tue, 31 Oct 2023 16:12:21 GMT, Joe Darcy <darcy at openjdk.org> wrote:

>> doc/testing.md line 147:
>> 
>>> 145:   manner.
>>> 146:   As a guideline, nearly all individual tests in `tier1` should complete in less than ten seconds
>>> 147:   when run on common configurations used for development. Long-running tests,
>> 
>> "should be complete" is okay, an alternative might be "are expected to complete" so better get across that it is aspirational.
>
> Updated wording.

Thanks for the explanation, for providing numbers, and for updating the test.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16384#discussion_r1378252161