Engineering validation tests are tests that help check if something in engineering (like a machine or a piece of technology) is working properly. Engineers use these tests to make sure their machines or pieces of technology will work the way they are supposed to. They'll make sure it can do all the things it's supposed to do, like turn on, turn off, run smoothly, and so on. By testing it in this way, engineers can ensure that everything is working properly and safely before they let anyone use it.