RFR: 8274083: Update testing docs to mention tiered testing [v3]

[David Holmes]

On 23/09/2021 8:33 pm, Thomas Stuefe wrote:
> On Thu, 23 Sep 2021 09:19:42 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:
> 
>>> Now that OpenJDK has more or less complete `tier{1,2,3,4}` definitions, let's mention them in `testing.md`.
>>>
>>> Current patch is my braindump, I am open for suggestions :)
>>
>> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
>>
>>    More fixes
> 
> I like this. Thanks for doing this (and for the actual definition of the tiers). This hopefully makes communicating about test coverage much easier.
> 
> As I understood, tier1-3 are the same as Oracle tier1-3?

Not exactly no. Our tier definitions are tuples of (tests, platforms, 
flags). The sets of tests will be close but not exactly the same.

David

> -------------
> 
> Marked as reviewed by stuefe (Reviewer).
> 
> PR: https://git.openjdk.java.net/jdk/pull/5615
>