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Display test suite

From: Clément Pit--Claudel
Subject: Display test suite
Date: Thu, 7 Jul 2016 11:47:54 -0400
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On 2016-07-07 11:15, Eli Zaretskii wrote:
> They also risk introducing bugs, and we don't really have a test
> suite for the display engine to be sure we didn't screw up anything.

Richard recently suggested giving Emacs the ability to take a screenshot of 
itself. Could we imagine using this to run regression tests of the display 

I already use a similar process in one of my packages: the idea is to script 
Emacs using a simple DSL (see 
 for an example, and 
for the output), and record a screenshot after each command; then, I use these 
images to generate the README page on 
https://github.com/cpitclaudel/company-coq/. Since these images are checked in, 
any time a change has visible consequences I see it immediately, and I can use 
ImageMagick to get a visual diff.

Of course, it could be hard to get screeenshots to looks exactly the same for 
everyone. Instead, we could have a makefile target that builds a large 
collection of these screenshots, and another one that rebuilds it and compares 
against a previously generated one.


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