mine's always worked fine, the test button function just like it should, reset sets it back to working.... though, no, no GFCI's will 'test' without power, of course.
apparently some of the new 'automatic' self testing units are too sensitive and don't like certain types of power - I'm also not sure why a 'self testing' unit makes any more sense than the typical GFCI unit - they are all problematic at times, and seem to be overly sensitive. If small children are present, I can understand more reasons for them.
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