WPE now supports running tests completely headless, but we are still invoking the waylanddriver to run the tests. This causes an error if the environment doesn't have defined the WAYLAND_DISPLAY or WAYLAND_SOCKET environment variables.
Created attachment 403430 [details] Patch
Just tested on the buildbox2 and tests seems to be working fine there. Nice!
Committed r263897: <https://trac.webkit.org/changeset/263897> All reviewed patches have been landed. Closing bug and clearing flags on attachment 403430 [details].