Command to check for updates?

[Max Brustkern]

I'm attempting to run automated upgrade tests from the stable release to
candidate versions. If I run
snap refresh x
and there is no new version of x, the snap command exits with status 1. Is
there a command I can use to check if an update is available and only
install in that case? Right now I don't know how to distinguish an update
failure from a case where the system is already up to date.

Thanks,
Max
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