The guy at Walmart had a load tester that presents a heavy load to the battery to check its' cranking amps. As long as the battery is well charged it should be able to pass this test. A discharged battery would fail the test but it might still be good.
Do you drive very short distances? Driving short distances without ever going on longer distance trips will eventually discharge your battery. If you have done a long trip recently the battery should have been charged and therefore should have passed.
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