Chromium still has some problems with automated end-to-end tests on Linux Wayland - for example, not being able to control window size and position without user interaction breaks some tab dragging tests that need two windows of a given size to be right next to each other.
We're already working around other limitations with a custom test protocol extension, but in this case, it seems easier to just emulate the user interaction needed to move and resize the windows! It's not as trivial as it might seem, mostly due to client-side decorations messing up the window bounds calculations, but I managed to get a first prototype working 😄