Very true. I know many high school students that just google the answer and get it. I know that there are some people (I'm thinking Dan Meyer) that have worked on making interesting math problems that can't just be "googled".
Another option is the student video. I have had students create and submit a derivation of a physics equation that was derived in the textbook AND in class. But still, I was able to tell from the video which students understood the concept.