If any test went on, it is done with safety precautions. My guess is su30 going supersonic is the reason, explosions obviously we can not explain. But missiles are fired at various speed of the jet, 05mach to supersonic, and we know there are 2 Su30 currently modified for NGARM & Astra firing. Astra is currently noted with project astra mk1 UT indicating user trial. So it could be a stage where the firing of it is tested at high speed.
It could also be gaurav type glide bombs who knows. Notam was 3-14th long and today morning I checked at around 11, it seemed it was active, planes were leaving the area.