Add 'loadstart' and 'loadend' events to some of our exciting layers like WFS, GML, GeoRSS, and Text. tests to back it up. (Closes #808)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@4252 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tests/Layer/test_Text.html

@@ -118,6 +118,19 @@
           t.eq(map.popups.length, 0, "no popup on second marker");
         });
     }
+    function test_Layer_Text_loadend_Event(t) {
+        t.plan(2);
+		layer = new OpenLayers.Layer.Text('Test Layer', {location:datafile});
+        t.delay_call(2, function() { 
+            layer.events.register('loadend', layer, function() { 
+                t.ok(true, "Loadend event fired"); 
+            });
+            layer.parseData({
+                'responseText':''
+            });
+            t.ok(true, "Parsing data didn't fail"); 
+        });
+    }
 
     function test_99_Layer_Text_destroy (t) {
         t.plan( 1 );