Suggested additions to "Testing" page

[Lars Westergren]

Hello,

Perhaps you are already working on this, but what I was missing the
most when I was writing my little "contribution guide" was a mention
that there are in fact a lot of tests included in OpenJDK when you do
a Mercurial checkout. All the documentation I could find only talked
about how to write your own jtreg tests, never where the existing
tests could be found.

Until there is a more complete page in place, perhaps you could just
add the following to the page for those who are currently working on
patches-

"OpenJDK tests are located in the jdk/test directory. If for instance
you have been changing code in the management package, you should at
the minimum run the tests located in jdk/test/java/lang/management"

Cheers,
Lars