Modify tests to work in FF on Mac -- functions are not run alphabetically there, so work needs to be repeated in 'subsequent' calls.

git-svn-id: http://svn.openlayers.org/trunk/openlayers@32 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tests/test_Layer.html

@@ -14,6 +14,7 @@
 
     function test_99_Layer_destroy (t) {
 	t.plan( 1 );	
+	layer = new OpenLayers.Layer('Test Layer');
 	layer.destroy();
 	t.eq( layer.map, null, "layer.map is null after destroy" );
     }