The radiant sensor, ignitor, and valve coils should all show continuity. The ignitor will have a resistance in the range of 100-300 ohms and will increase as the ignitor gets older.
The coils resistances will be higher. This page has detailed explanations and specs on the valve coils.
The only component not shown here, which is unfortunate, is the high limit thermostat, which is attached to the burner cone.
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