tests: Add unit tests for g_queue_push_nth_link()
tests: Add unit tests for g_queue_push_nth_link()

This should get its branch coverage up to 100%. For completeness’ sake.

Signed-off-by: Philip Withnall <29c2a2ac2a854b9cf047275aa9de346d096be2e0@endlessm.com>

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