michael@0: function run_test()
michael@0: {
michael@0:   // XXX Work around for the fact that for non-libxul builds loading gfx
michael@0:   // components doesn't call up the layout initialisation routine. This should
michael@0:   // be fixed/improved by bug 515595.
michael@0:   Components.classes["@mozilla.org/layout/xul-boxobject-tree;1"]
michael@0:             .createInstance(Components.interfaces.nsIBoxObject);
michael@0: 
michael@0:   let rgn = Components.classes["@mozilla.org/gfx/region;1"].createInstance(Components.interfaces.nsIScriptableRegion);
michael@0:   do_check_true (rgn.getRects() === null)
michael@0:   rgn.unionRect(0,0,80,60);
michael@0:   do_check_true (rgn.getRects().toString() == "0,0,80,60")
michael@0:   rgn.unionRect(90,70,1,1);
michael@0:   do_check_true (rgn.getRects().toString() == "0,0,80,60,90,70,1,1")
michael@0: }
michael@0: