For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ojkastl_buildservice:Branch_systemsmanagement_ansible/openSUSE_Tumbleweed/home:ojkastl_buildservice:Branch_systemsmanagement_ansible.repo
zypper refresh
zypper install molecule-plugins
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:ojkastl_buildservice:Branch_systemsmanagement_ansible/16.0/home:ojkastl_buildservice:Branch_systemsmanagement_ansible.repo
zypper refresh
zypper install molecule-plugins