Test it

You can test the configuration by just calling the script directly:
./sunpaper.sh

There are a few option flags that can help you during testing (these cannot be combined):

Clear! Use this to clear the cache files. Call this after any configuration change or after using a testing flag to force a wallpaper update.
./sunpaper.sh -c

Report! Show a table of all the time events scheduled for the day.
./sunpaper.sh -r

Time! Want to see what will happen later today? This option will set a custom time so you can see what your wallpaper will look like then. It must be in HH:MM format. (-t 06:12)
./sunpaper.sh -t HH:MM

Sky! A weather testing flag. Set conditions here to see what your wallpaper will look like in different weather. Depends on Live Weather Mode, obviously. And weather is normally cached for a period of time so you may need to call -c first to clear the cache in order to see changes.
Clear | Clouds | Rain | Thunderstorm | Fog
./sunpaper.sh -s Rain