This is not really a test. It just starts xeyes and sees if anything
explodes.
However, the reason for this test is to stabilise code coverage.
Apparently, Gtk(?) sometimes creates shaped windows. This had the effect
that codecov always reports random changes to code coverage, depending
on if this specific test run saw any shaped client windows or not.
Thus, by explicitly adding a test that runs a shaped client, hopefully
these random fluctuations disappear.
Hopefully-fixes: https://github.com/awesomeWM/awesome/issues/1975
Signed-off-by: Uli Schlachter <psychon@znc.in>