For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ecsos:Publishing/openSUSE_Tumbleweed/home:ecsos:Publishing.repo
zypper refresh
zypper install junit5
For openSUSE Slowroll run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ecsos:Publishing/openSUSE_Slowroll/home:ecsos:Publishing.repo
zypper refresh
zypper install junit5
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ecsos:Publishing/16.0/home:ecsos:Publishing.repo
zypper refresh
zypper install junit5