glib-2.0: Some nullable arguments in GLib.Test.*
glib-2.0: Some nullable arguments in GLib.Test.*

https://bugzilla.gnome.org/show_bug.cgi?id=772964

GNOME/vala,GNOME/vala,frida/vala,GNOME/vala,frida/vala,frida/vala,frida/vala,GNOME/vala,frida/vala