diff --git a/tests/Layer/ArcGIS93Rest.html b/tests/Layer/ArcGIS93Rest.html
index 7c815b773e..4f1a4c618d 100644
--- a/tests/Layer/ArcGIS93Rest.html
+++ b/tests/Layer/ArcGIS93Rest.html
@@ -155,8 +155,7 @@
         map.addLayer(layer);
         map.zoomToMaxExtent();
 
-        var redraw = OpenLayers.Layer.prototype.redraw;
-        OpenLayers.Layer.prototype.redraw = function() {
+        layer.redraw = function() {
             t.ok(true, "layer is redrawn after new params merged");
         }
 
@@ -168,8 +167,6 @@
         newParams.CHICKPEAS = 151;
 
         t.eq( layer.params.CHICKPEAS, "png", "mergeNewParams() makes clean copy of hashtable");
-
-        OpenLayers.Layer.prototype.redraw = redraw;
         map.destroy();
     }
 
diff --git a/tests/Layer/HTTPRequest.html b/tests/Layer/HTTPRequest.html
index 2025677fe4..02311564f1 100644
--- a/tests/Layer/HTTPRequest.html
+++ b/tests/Layer/HTTPRequest.html
@@ -92,14 +92,13 @@
         t.eq( log[0].scope, scope, "mergeNewParams() executes changelayer listener with expected scope");
 
         newParams.chickpeas = 151;
-        t.eq( layer.params.chickpeas, "image/png", "mergeNewParams() makes clean copy of hash");
 
-        var redraw = OpenLayers.Layer.prototype.redraw;
-        OpenLayers.Layer.prototype.redraw = function() {
-            t.eq(this.resolution, null, 'mergeNewParams sets layer resolution to null, causing redraw to call moveTo with zoomChanged set to true');
-        };
+        t.eq( layer.params.chickpeas, "image/png", "mergeNewParams() makes clean copy of hash");
+        
+        layer.redraw = function() {
+            t.ok(true, "layer.mergeNewParams calls layer.redraw");
+        }
         layer.mergeNewParams();
-        OpenLayers.Layer.prototype.redraw = redraw;
     }
 
     function test_Layer_HTTPRequest_getFullRequestString (t) {
diff --git a/tests/Layer/KaMap.html b/tests/Layer/KaMap.html
index b2c22cf650..b22917fda0 100644
--- a/tests/Layer/KaMap.html
+++ b/tests/Layer/KaMap.html
@@ -153,9 +153,7 @@
 
         map.addLayer(layer);
         map.zoomToMaxExtent();
-
-        var redraw = OpenLayers.Layer.prototype.redraw;
-        OpenLayers.Layer.prototype.redraw = function() {
+        layer.redraw = function() {
             t.ok(true, "layer is redrawn after new params merged");
         }
         
@@ -167,8 +165,6 @@
         newParams.chickpeas = 151;
 
         t.eq( layer.params.chickpeas, "image/png", "mergeNewParams() makes clean copy of hashtable");
-
-        OpenLayers.Layer.prototype.redraw = redraw;
         map.destroy();
     }
 
diff --git a/tests/Layer/MapGuide.html b/tests/Layer/MapGuide.html
index f71218071c..b1eb386c27 100644
--- a/tests/Layer/MapGuide.html
+++ b/tests/Layer/MapGuide.html
@@ -132,8 +132,7 @@
         map.addLayer(layer);
         map.zoomToMaxExtent();
 
-        var redraw = OpenLayers.Layer.prototype.redraw;
-        OpenLayers.Layer.prototype.redraw = function() {
+        layer.redraw = function() {
             t.ok(true, "layer is redrawn after new params merged");
         }
 
@@ -145,8 +144,6 @@
         newParams.chickpeas = 151;
 
         t.eq( layer.params.chickpeas, "image/png", "mergeNewParams() makes clean copy of hashtable");
-
-        OpenLayers.Layer.prototype.redraw = redraw;
         map.destroy();
     }
 
diff --git a/tests/Layer/MapServer.html b/tests/Layer/MapServer.html
index ff8cdf4e53..16e59156e3 100644
--- a/tests/Layer/MapServer.html
+++ b/tests/Layer/MapServer.html
@@ -136,8 +136,7 @@
         map.addLayer(layer);
         map.zoomToMaxExtent();
         
-        var redraw = OpenLayers.Layer.prototype.redraw;
-        OpenLayers.Layer.prototype.redraw = function() {
+        layer.redraw = function() {
             t.ok(true, "layer is redrawn after new params merged");
         }
         layer.mergeNewParams(newParams);
@@ -148,8 +147,6 @@
         newParams.chickpeas = 151;
 
         t.eq( layer.params.chickpeas, "image/png", "mergeNewParams() makes clean copy of hashtable");
-
-        OpenLayers.Layer.prototype.redraw = redraw;
         map.destroy();
     }
 
diff --git a/tests/Layer/WMS.html b/tests/Layer/WMS.html
index bb04560c88..a07b36c1d9 100644
--- a/tests/Layer/WMS.html
+++ b/tests/Layer/WMS.html
@@ -195,8 +195,7 @@
         map.addLayer(layer);
         map.zoomToMaxExtent();
 
-        var redraw = OpenLayers.Layer.prototype.redraw;
-        OpenLayers.Layer.prototype.redraw = function() {
+        layer.redraw = function() {
             t.ok(true, "layer is redrawn after new params merged");
         }
 
@@ -208,8 +207,6 @@
         newParams.CHICKPEAS = 151;
 
         t.eq( layer.params.CHICKPEAS, "image/png", "mergeNewParams() makes clean copy of hashtable");
-
-        OpenLayers.Layer.prototype.redraw = redraw;
         map.destroy();
     }