make check For Extensions

Hackers,

Andres said during the unconference last month that there was a way to get `make check` to work with PGXS. The idea is that it would initialize a temporary cluster, start it on an open port, install an extension, and run the extension's test suite. I think the pg_regress --temp-install, maybe? I poked through the PGXS makefiles, and although it looks like there *might* be something like this for in-core contrib extensions, but not for externally-distributed extensions.

Is there something I could add to my extension Makefiles so that `make check` or `make test` will do a pre-install test on a temporary cluster?

Thanks,

David