Added a doctest [skip hazardlib]
Added a doctest [skip hazardlib]


Former-commit-id: dc08fa6d6e37a371705ee2059f1c6f280aaa28fa [formerly c13e4414b3b236a2ffc14440af6a4d2550895610]
Former-commit-id: 2b8d432cbe419863a21ea54c8ed8cdcdde9d6a3c
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine