For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Jeffreycheung:branches:openSUSE:Factory/openSUSE_Tumbleweed/home:Jeffreycheung:branches:openSUSE:Factory.repo
zypper refresh
zypper install rt-tests
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Jeffreycheung:branches:openSUSE:Factory/15.5/home:Jeffreycheung:branches:openSUSE:Factory.repo
zypper refresh
zypper install rt-tests
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Jeffreycheung:branches:openSUSE:Factory/15.4/home:Jeffreycheung:branches:openSUSE:Factory.repo
zypper refresh
zypper install rt-tests
For 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:Jeffreycheung:branches:openSUSE:Factory/15.3/home:Jeffreycheung:branches:openSUSE:Factory.repo
zypper refresh
zypper install rt-tests