Which simulation enviroment use to conduct automated tests?

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I am looking for an simulation enviroment which supports conductiong automated tests of my robot in virtual enviroment. Something what could be used in CI. I would like to define cases like, collisions, leaving pre-defined area etc. I would be also good to have scripts which could activate some events (like causing obstacle movement) after specified time or when my robot approaches. Firstly i tas thinking about gazebo, but I could'nt find anything about automation in tests.