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

[Joe Darcy]

On Fri, 27 Oct 2023 10:05:39 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Implement review feedback.
>
> doc/testing.md line 141:
> 
>> 139:   Roughly speaking, a failure of a test in this tier has the potential to
>> 140:   indicate a problem that would affect many Java programs. Tests in `tier1` include
>> 141:   tests of HotSpot, libraries in the `java.base` module, and the `javac` compiler.
> 
> Not all libraries in `java.base` are tested in tier1. For instance, `java.net` or `java.nio` are part of tier2.
> My worry here is that developers may misinterpret this statement and think the code they have modified in `java.base` will be tested if they run `tier1`. Maybe this sentence could be slightly altered to say that:
> 
>> ... `tier1` include tests of HotSpot, **some** libraries in the `java.base` module, ...

Will changed to "selected libraries in java.base"; thanks.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16384#discussion_r1375074748