Well there is a tool to check spark, but if you are in a pinch and only have a screwdriver (which most supra owners will probably have), you can:
Pull the spark plug boot off of the plug
Gently stick a screwdriver (metal end) into the boot until it contacts the connector
hold the screwdriver (plastic end) with the metal part of the screwdriver an 8th of an inch away from any grounded metal on the engine
Have someone crank the engine and watch for a spark. DO NOT allow the metal of the screwdriver to contact the engine, you must maintain a very small gap. Also try not to touch any grounded metal on the car yourself or the spark can jump to your hand, only hurts a little but it'll make you jump.
If you have a plug socket available, you can just unscrew the spark plug, put the wire back on and ground the threaded section against some metal while someone cranks the engine. Again look for spark while cranking.
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