Your page http://www.ca.postgresql.org/ftpsite/binary/v7.2/RPMS/README.rpm-dist
says to run regression tests by
cd /usr/lib/pgsql/test/regress
./pg_regress.sh --schedule=parallel_schedule
but this directory does not exist. SFAICT, the regression tests are only in the
source rpm. The latest documentation (I'm using 7.2.1-4 on RH 7.2) says to run
regression tests by running various gmake commands from the build directory.
This is of no help if you're installing from a binary rpm rather than from source.