RFR: JDK-8296240: Augment discussion of test tiers in doc/testing.md [v2]

[Jonathan Gibbons]

On 10/29/23 11:21 AM, Alan Bateman wrote:
> On Sat, 28 Oct 2023 21:03:50 GMT, Joe Darcy <darcy at openjdk.org> wrote:
>
>> So in terms of a sentence or two of guidance, I think "aim for 10 seconds or less almost all of the time for a tier 1 test" is reasonable in this context.
> Yes, I think making it an aspiration would be better.
>
> In passing, you have "selected libraries in the `java.base` module".  It might be better to say core APIs in java.base rather than "selected libraries".
>
> -------------
>
> PR Comment: https://git.openjdk.org/jdk/pull/16384#issuecomment-1784188449


As well as aspirational guidelines for tier1 tests to be fast, I have 
long espoused the view (rule?) that all tests should be able to run 
without using `-timeoutfactor` on a reasonable contemporary developer 
machine, with a suggestion that a test should never take for longer than 
half its declared timeout period.

-- Jon