How to design contact pins for testing SMD board? Only optical inspection possible testing technique?
For very small boards, you can test before depanelizing.  Bring the test points out into the panel, through an inner layer so the depanelization process doesn't tear up the rest of the traces.

Or just use smaller probes.  Semiconductors are tested before sawing up the wafer, using machines that are maybe 60 dB more expensive than pogo pins in a circuit board.