nixosTests.mate-wayland: Check for more text (#377283)

            machine.wait_for_file("/run/user/${toString user.uid}/wayland-1")

        with subtest("Check if MATE session components actually start"):

            for i in ["wayfire", "mate-panel", "mate-wayland.sh", "mate-wayland-components.sh"]:

                machine.wait_until_succeeds(f"pgrep -f {i}")

            # It is expected that this applet doesn't work in Wayland

            machine.wait_for_text('WorkspaceSwitcherApplet')

            for i in ["wayfire", "mate-panel", "mate-wayland.sh"]:

                machine.wait_until_succeeds(f"pgrep {i}")

            machine.wait_until_succeeds("pgrep -f mate-wayland-components.sh")

            # It is expected that WorkspaceSwitcherApplet doesn't work in Wayland

            machine.wait_for_text('(panel|Factory|Workspace|Switcher|Applet|configuration)')

        with subtest("Check if various environment variables are set"):

            cmd = "xargs --null --max-args=1 echo < /proc/$(pgrep -xf mate-panel)/environ"