RFR: 8274083: Update testing docs to mention tiered testing [v4]

[Aleksey Shipilev]

On Thu, 23 Sep 2021 11:54:06 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Drop GH link
>
> doc/testing.html line 72:
> 
>> 70: <p>The test specifications given in <code>TEST</code> is parsed into fully qualified test descriptors, which clearly and unambigously show which tests will be run. As an example, <code>:tier1</code> will expand to <code>jtreg:$(TOPDIR)/test/hotspot/jtreg:tier1 jtreg:$(TOPDIR)/test/jdk:tier1 jtreg:$(TOPDIR)/test/langtools:tier1 jtreg:$(TOPDIR)/test/nashorn:tier1 jtreg:$(TOPDIR)/test/jaxp:tier1</code>. You can always submit a list of fully qualified test descriptors in the <code>TEST</code> variable if you want to shortcut the parser.</p>
>> 71: <h3 id="common-test-groups">Common Test Groups</h3>
>> 72: <p>In the ideal world, contributors would be advised to run all the tests for every change. But in real world, one could only be expected to run as many tests as practical, while being mindful of the scope for the change, the testing resources available, etc.</p>
> 
> A suggestion here is to start with something like "Ideally, all tests are run for every change but this may not be practical. Contributors are expected to at least run tier1 (see below) and the tests for the areas that are changed."

Added a version of that, thanks.

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PR: https://git.openjdk.java.net/jdk/pull/5615