diff --git a/test/index.html b/test/index.html
index 629d8958a..613c796b3 100644
--- a/test/index.html
+++ b/test/index.html
@@ -74,15 +74,6 @@
 				setProperty(String.prototype, '_contains', String.prototype.contains);
 				setProperty(String.prototype, 'contains', String.prototype._contains ? function() {} : Boolean);
 
-				setProperty(String.prototype, '_trim', String.prototype.trim);
-				setProperty(String.prototype, 'trim', String.prototype._trim ? function() {} : String);
-
-				setProperty(String.prototype, '_trimLeft', String.prototype.trimLeft);
-				setProperty(String.prototype, 'trimLeft', String.prototype._trimLeft ? function() {} : String);
-
-				setProperty(String.prototype, '_trimRight', String.prototype.trimRight);
-				setProperty(String.prototype, 'trimRight', String.prototype._trimRight ? function() {} : String);
-
 				setProperty(window, 'WinRTError', Error);
 
 				setProperty(document, '_createDocumentFragment', document.createDocumentFragment);
@@ -120,19 +111,10 @@
 				} else {
 					delete Object.keys;
 				}
-				for (var key in {
-					'contains': true,
-					'trim': true,
-					'trimLeft': true,
-					'trimRight': true
-				}) {
-					var func = String.prototype['_' + key];
-					if (func) {
-						setProperty(String.prototype, key, func);
-					} else {
-						delete String.prototype[key];
-					}
-					delete String.prototype['_' + key];
+				if (String.prototype._contains) {
+					setProperty(String.prototype, 'contains', String.prototype._contains);
+				} else {
+					delete String.prototype.contains;
 				}
 				setProperty(window, 'WinRTError', undefined);
 				setProperty(Function.prototype, 'toString', Function.prototype._toString);
@@ -148,6 +130,7 @@
 				delete Object._defineProperty;
 				delete Object._getPrototypeOf;
 				delete Object._keys;
+				delete String.prototype._contains;
 			}
 
 			// load Lo-Dash and expose it to the bad extensions/shims
diff --git a/test/test.js b/test/test.js
index d73f97004..c2727dfdb 100644
--- a/test/test.js
+++ b/test/test.js
@@ -341,15 +341,6 @@
     var _contains = String.prototype.contains;
     setProperty(String.prototype, 'contains',  _contains ? function() {} : Boolean);
 
-    var _trim = String.prototype.trim;
-    setProperty(String.prototype, 'trim', _trim ? function() {} : String);
-
-    var _trimLeft = String.prototype.trimLeft;
-    setProperty(String.prototype, 'trimLeft', _trimLeft ? function() {} : String);
-
-    var _trimRight = String.prototype.trimRight;
-    setProperty(String.prototype, 'trimRight',  _trimRight ? function() {} : String);
-
     // clear cache so Lo-Dash can be reloaded
     emptyObject(require.cache);
 
@@ -365,20 +356,11 @@
     setProperty(Object, 'keys', _keys);
     setProperty(Function.prototype, 'toString', _fnToString);
 
-    _.forOwn({
-      'contains': _contains,
-      'trim': _trim,
-      'trimLeft': _trimLeft,
-      'trimRight': _trimRight
-    },
-    function(func, key) {
-      if (func) {
-        setProperty(String.prototype, key, func);
-      } else {
-        delete String.prototype[key];
-      }
-    });
-
+    if (_contains) {
+      setProperty(String.prototype, 'contains', _contains);
+    } else {
+      delete String.prototype.contains;
+    }
     delete global.window;
     delete global.WinRTError;
     delete Function.prototype._method;