Drop testing is a test that is performed to a part in its packaging where it is dropped on its corner from a height and then monitor its survival. Heights can be up to 1.5 meters. Usually this type of test is recommended when manufacturing something fragile and you need to ensure it makes it to your customers in one piece.
Your packaging designer or the company who are designing the packaging should have the ability to design the packaging to suit a drop test but it is up to you to inform them of your requirements. Failure to inform the relevant people could be costly so be sure to pass on all the information you have.