tests: Add glib-mkenums test for missing nicks
tests: Add glib-mkenums test for missing nicks

This adds a test to verify the change from issue #1360.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

https://gitlab.gnome.org/GNOME/glib/issues/1360

endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib