In principle, Short Circuit Safe Operating Area (SCSOA) seems like a simple test. Connect the DUT to a high voltage power source. Pulse the gate fully on for a few microseconds so the device draws as much current as possible and see if the device survives. The issue is that this has to be done at the rated operating voltage (1KV and higher) and with low enough inductance and resistance that the DUT is the current limiter. Next you have to make it safe when the DUT dies, without invalidating the test. This presentation discusses the challenges and some solutions.
