Add missing drop_collection in tests fields
Add missing drop_collection in tests fields

MakerReduxCorp/mongoengine,ProgressivePlanning/mongoengine,cogniteev/mongoengine,Davidrjx/mongoengine,cogniteev/mongoengine,MongoEngine/mongoengine,ConsumerPhysics/mongoengine,touilleMan/mongoengine,MakerReduxCorp/mongoengine,Davidrjx/mongoengine