Do the battery test with a voltmeter but it may also be a "dead spot" on the starter commutator. Sometimes the brushes get stuck and don't make good contact with the commutator. Sometimes it's an actual dead or dirty spot on the commutator. If the battery tests good, try wacking the starter with a board or hammer and then try to crank.
18 to 24" of 1/2" hard copper tubing works well for whacking the solenoid and also for jumping it. I always carry that and a 2' long screwdriver for both duties. Double safe.
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