The outside cylnders run off one coil and the inside two run off another coil, so there is a problem with a wire off or coil failed. if you swap the input wires on the two coils and the same coil doesnt spark it is definately that coil.
if you have a multi meter,
check the primary resistance on both coils around 2 ohms.
and secondary resistance between the two plug leads with the caps removed about 15 ohms, these figures are aproximate but you are looking for a different reading in the coil that doesnt work.
The black box is likely ok because one coil sparks. The other check would be the pick up coils which will be around 400ohms.
Make sure when you check for spark that a plug is in the plug cap and it is grounded to the engine or this can build up current in the coil and damage it
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