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From: Lars Brinkhoff <lars@nocrew.org>
Newsgroups: gmane.emacs.devel
Subject: Re: (error "Window system frame should be used")
Date: Fri, 21 Apr 2017 07:28:43 +0200
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Lars Ingebrigtsen wrote:
> Hm.  Is there no way to create a headless Emacs that has window-system
> frames?  It seems kinda unlikely that we don't have a way to test these
> things?

I'm wildly guessing it shouldn't be impossible to create a
stub/shim/mock window system that's available in batch mode.

If someone were interested in looking into this, how would they
reproduce your error?