Added tests for create_hazardcurve_writer.
Added tests for create_hazardcurve_writer.


Former-commit-id: 08434801ece70be42e7cd41c9eb1e847651becff [formerly 08434801ece70be42e7cd41c9eb1e847651becff [formerly 8248bdddd2d159d374fb1953d197556ebb45f095]]
Former-commit-id: e3fe22300e0742e02d30834cf9cd2be0fc8b013f
Former-commit-id: 9036ef4d5267468f1320666de33bee3ceeee0475
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine