tests: Add (failing) test case for GParamSpec arguments
tests: Add (failing) test case for GParamSpec arguments

This reproduces
https://bugzilla.gnome.org/show_bug.cgi?id=682355

davibe/pygobject,sfeltman/pygobject,GNOME/pygobject,davibe/pygobject,davibe/pygobject,davibe/pygobject,GNOME/pygobject,GNOME/pygobject,pexip/pygobject,sfeltman/pygobject,pexip/pygobject,sfeltman/pygobject,pexip/pygobject