Comment 5 for bug 1690706

It does help. It changes the error message to:

libcolord-gtk:ERROR:cd-self-test.c:45:cd_window_get_profile_cb: assertion failed (error == NULL): failed to connect to colord: Could not connect: No such file or directory (cd_window_error, 0)
FAIL cd-self-test (exit status: 134)

But of course, there's no system bus inside the chroot and colord lives on the system bus.

I think this could in theory be an autopkgtest. If you compile just the test:

  $ gcc $(pkg-config --cflags colord-gtk) -DCD_COMPILATION cd-self-test.c $(pkg-config --libs colord-gtk) -o cd-self-test
  $ dbus-run-session -- xvfb-run -a ./cd-self-test
  [...]
  ERROR:cd-self-test.c:45:cd_window_get_profile_cb: assertion failed (error == NULL): no device with that property: property match 'XRANDR_name'='screen' does not exist (cd_window_error, 0)

it doesn't quite work, but nearly. Maybe upstream would have an idea here.