Added a comment explaining the meaning of the test
Added a comment explaining the meaning of the test


Former-commit-id: e3585972c7bb0bf1159e1c22e3531bef6497462e [formerly 1a9f9f89912e9d41d347a94e616009a976df6a84]
Former-commit-id: f9ca4c6ef1170e2a0bb889356086b250cdafd0af
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine