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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Emacs 27.1 Windows Binaries -- testing wanted
Date: Sat, 22 Aug 2020 09:37:36 +0300
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> Date: Fri, 21 Aug 2020 22:56:42 +0100
> From: phillip.lord@russet.org.uk
> Cc: emacs-devel@gnu.org
> 
> That would be useful, but then I'd need to know what the correct answers 
> are.

The correct answers can be found by comparing against
system-configuration-features, I think.

And you have the same problem with your ERT-based approach, no?