Added test for compose writers
Added test for compose writers


Former-commit-id: a6eebeac64dde19629b51b4bfd690ed5fcb458d5 [formerly 0fc4993fb09eab1bf79c638ee1e5f1ca51016cf2]
Former-commit-id: 0bb6055600363c8449a586ea878f39f38d317477
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine