How to run tests before pushing a backport changeset?

[Man Cao]

Hi,

We have a follow-up question: is there any difference on the testing policy
for JDK12u? Should we seek sponsorship from one of the maintainers from
Oracle to run tests before pushing a backport changeset to JDK12u? Or could
we just run tier1 tests for fastdebug|release locally and then push?
Also, any changeset that goes into jdk-updates/jdk12u should NOT affect the
soon-to-be-released JDK12 that is currently in Release Candidate phase,
right?

Could one of the CCed JDK12u maintainers also provide some clarification?

-Man