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Yep, shorts and gas are handy tests to have. I suspect that back in the day, when tubes were plentiful and there was not a finite and ever shrinking supply like there is today, that it was easy to test em and replace if weak. Like replacing your tires when they still have a little tread left. If there were no more tires being made we wouldn't toss them until they were unrepairably flat. If a service shop was working on a radio or TV, they'd replace weak or bad ones.
This probably explains why there are boxes of old used tubes in attics and basements that still test weak or good.
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Summer's here and the time is right. 
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