I once passed some take-home test from a small startup. They then requested a further take-home which a) would be monitored (it was a remote position) and b) would require some six to eight hours and c) would have to be done over the weekend. There had been no contact with anyone at that point other than passing the initial test, and no discussion of salary, benefits, etc.

I've rarely used unprofessional language in job application emails, but on that occasion I pretty much told them to take their no-name little company and shove it.