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%!test <*55322>
%! hf = figure ("visible", "off");
%! unwind_protect
%!   hax = axes ("parent", hf);
%!   hg = hggroup ();
%!   hl = line (hax, [0, 1], [1, 1], "parent", hax, "parent", hg);
%!   assert (get (hax, "children"), hg);
%!   assert (get (hg, "children"), hl);
%! unwind_protect_cleanup
%!   close (hf);
%! end_unwind_protect