CheckOnly Before Merge

(sf) The full set of Apex tests on the task branch is automatically validated (checkOnly) against the packaging org or production org when the pull request is created. (TBD)

Note: On a non-SF system, the equivalent would be to run a mock merge, build, and test deployment of the task branch to the staging or production environment, where the deployment is rolled back before it has any affect. 

Please submit feedback to the DreamOps Success Group