Added a doctest [skip CI]
Added a doctest [skip CI]


Former-commit-id: ff8e826b50eefcb52d47e2bc0b9dcf22ad2db3a4 [formerly 655e7b698ac4c5ab348e3c4ee8473381f1f47598]
Former-commit-id: ca377fca17d361f6671313cbdff12a364ef13c35
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine