I haven't found a video of push tests on an arm, but this one might be close enough.
I don't know much about this instructor, but the beginning of this fragment looks like push tests we do (to about 2:40). Uke is not pushing on the instructor's arm, but directly on his center, which probably makes it easier. Also, the instructor is obviously pushed on his heels at the start. He has to correct a bit and he might be leaning on uke later on, so there is room for improvement here.