Added the tests 6b, 7a, 7b, 7c
Added the tests 6b, 7a, 7b, 7c


Former-commit-id: dbe137363e47bb1b468e99e16f155c143a54d7b6 [formerly 624fb0eab3016fbcc26ab73fcf934397105f1201]
Former-commit-id: a04716b0b6be24c2e142c186230bfbe8fbc1b4d4
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine