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They make those with a button to test GFCI receptacles, to ensure they are working properly, plug the tester in, push the button, and the GFCI should trip. FWIW by code, an ungrounded receptacle can only be replaced by a GFCI receptacle if there is no ground available at the junction box where the receptacle is mounted. Es no bueno to replace an ungrounded receptacle with a regular 3-prong grounded one, which is what happens a lot by DIYers. And this is why you should have one of those testers mentioned in an above post.
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