On 23-07-2022 13:38, Hilton Chain wrote:

> xvfb-run works well, however some "Fontconfig error: No writable cache directories"
> occurs. I don't know what to do with this, do you have any ideas?

For these kind of things, creating the relevant directory and setting an 
environment variable tends to work. Maybe try (setenv "HOME" 
(getcwd)))?  However, IIUC, these fontconfig errors can usually be 
ignored (probably because it's just a cache?), likely the "Transport 
endpoint is not connected" test failure is independent.

My guess is that it tries to connect to the WM i3, but that WM is not 
running in the build environment fails.

You could give starting the WM before running the test a try, but maybe 
it's not worth the effort.

Greetings,
Maxime.