If a Linux laptop has been configured to stop charging the battery at a value below 100% (to increase battery longevity by preventing over-charging), and is charged to the configured maximum, SDL reports that as SDL_POWERSTATE_UNKNOWN but still reports a percentage.

I wouldn't have noticed this, except that my laptop happens to make the assertion fail most of the time :-)

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py-sdl / py-sdl2

power_test: Relax assertions about known information #231

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