For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Jeffreycheung/openSUSE_Tumbleweed/home:Jeffreycheung.repo
zypper refresh
zypper install rt-tests
For openSUSE Leap 15.2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Jeffreycheung/openSUSE_Leap_15.2/home:Jeffreycheung.repo
zypper refresh
zypper install rt-tests
For SLE 15 SP1 Backports run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Jeffreycheung/SLE_15_SP1_Backports/home:Jeffreycheung.repo
zypper refresh
zypper install rt-tests