connection-test: Add test case to stress connection buffers
connection-test: Add test case to stress connection buffers

This catches the bug fixed in cab70c9e5d8c38260a07bb1ddb7618826a120465.

abooij/wayland,bitfactor/wayland,eyolfson/wayland,bitfactor/wayland,eyolfson/wayland,tulcod/wayland,bitfactor/wayland,mchalupa/wayland,abooij/wayland,sir-murray/wayland,mchalupa/wayland,sir-murray/wayland,mchalupa/wayland,tulcod/wayland,abooij/wayland,eyolfson/wayland,tulcod/wayland,sir-murray/wayland