Well, I see it like this: CORE is for the reactos part
(/reactos/trunk/reactos/), ROSAPPS is for the subdirectory ROSAPPS (which is
not very touched) and ROSTESTS for the tests (winetests + kmtests + apitests
+ ...)
You want to "merge" (in Jira) all of them ?

Initially we had this as one SVN repo (as Colin mentioned) but it was impractical to use due to performance issues (that are now hopefully solved) so we split them up. There is no need to do that anymore. When you commit something in any part of the reactos svn repo (be it core, tests...etc) it will be handled by the "reactos" FishEye repo and smart commits for instance will still work.

I removed the redundant CORE, ROSTESTS and ROSAPPS repositories, so now we have one repo (reactos) to rule them all.

Cheers,
Amine.