diff --git a/test/asset/set.js b/test/asset/set.js
index 560615b84..893291aa1 100644
--- a/test/asset/set.js
+++ b/test/asset/set.js
@@ -21,7 +21,7 @@
   /*--------------------------------------------------------------------------*/
 
   /**
-   * Creates a Set object to optimize linear searches of large arrays.
+   * Creates a `Set` object.
    */
   function Set() {
     this.__cache__ = {};
@@ -81,7 +81,7 @@
    * Adds `value` to the set.
    *
    * @memberOf Set
-   * @param {*} value The value to add to the set.
+   * @param {*} value The value to add.
    */
   function add(value) {
     var cache = this.__cache__,
diff --git a/test/asset/weakmap.js b/test/asset/weakmap.js
new file mode 100644
index 000000000..01d02be00
--- /dev/null
+++ b/test/asset/weakmap.js
@@ -0,0 +1,76 @@
+;(function() {
+
+  /** Used to determine if values are of the language type Object */
+  var objectTypes = {
+    'function': true,
+    'object': true
+  };
+
+  /** Used as the `WeakMap#toString` return value */
+  var nativeString = String(Object.prototype.toString).replace(/toString/g, 'WeakMap');
+
+  /** Used as a reference to the global object */
+  var root = (objectTypes[typeof window] && window) || this;
+
+  /** Detect free variable `global` from Node.js or Browserified code and use it as `root` */
+  var freeGlobal = objectTypes[typeof global] && global;
+  if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal || freeGlobal.self === freeGlobal)) {
+    root = freeGlobal;
+  }
+
+  /*--------------------------------------------------------------------------*/
+
+  /**
+   * Creates a `WeakMap` object.
+   */
+  function WeakMap() {
+    // no-op
+  }
+
+  /*--------------------------------------------------------------------------*/
+
+  /**
+   * Gets the value associated with the given key.
+   *
+   * @memberOf WeakMap
+   * @param {Object} key The key object.
+   * @returns {*} Returns the associated value, else `undefined`.
+   */
+  function get(key) {
+    return key.__weakmap__;
+  }
+
+  /**
+   * Sets a value for the given key.
+   *
+   * @memberOf WeakMap
+   * @param {Object} key The key object.
+   * @param {*} value The value to set.
+   */
+  function set(key, value) {
+    key.__weakmap__ = value;
+    return this;
+  }
+
+  /**
+   * Produces the `toString` result of `WeakMap`.
+   *
+   * @static
+   * @memberOf WeakMap
+   * @returns {string} Returns the string result.
+   */
+  function toString() {
+    return nativeString;
+  }
+
+  /*--------------------------------------------------------------------------*/
+
+  WeakMap.toString = toString;
+  WeakMap.prototype.get = get;
+  WeakMap.prototype.set = set;
+
+  // expose `WeakMap`
+  if (!root.WeakMap) {
+    root.WeakMap = WeakMap;
+  }
+}.call(this));
diff --git a/test/index.html b/test/index.html
index 8e80e4e46..f9a90d713 100644
--- a/test/index.html
+++ b/test/index.html
@@ -26,6 +26,7 @@
 		<script src="../vendor/qunit-extras/qunit-extras.js"></script>
 		<script src="../vendor/platform.js/platform.js"></script>
 		<script src="./asset/set.js"></script>
+		<script src="./asset/weakmap.js"></script>
 		<script src="./asset/test-ui.js"></script>
 		<div id="qunit"></div>
 		<div id="exports"></div>
@@ -154,6 +155,9 @@
 						return Float64Array;
 					}());
 				}
+				setProperty(window, '_Set', window.Set);
+				setProperty(window, 'Set', noop);
+
 				setProperty(window, '_WeakMap', window.WeakMap);
 				setProperty(window, 'WeakMap', noop);
 
@@ -238,6 +242,11 @@
 				}
 				setProperty(window, '_ArrayBuffer', undefined);
 
+				if (window._Set) {
+					Set = _Set;
+				}
+				setProperty(window, '_Set', undefined);
+
 				if (window._WeakMap) {
 					WeakMap = _WeakMap;
 				}
@@ -274,6 +283,7 @@
 			// store Lo-Dash to test for bad extensions/shims
 			if (!ui.isModularize) {
 				var lodashBizarro = window._;
+				lodashBizarro.support.funcNames = !lodashBizarro.support.funcNames;
 				window._ = undefined;
 				removeBizarroMethods();
 			}
diff --git a/test/test.js b/test/test.js
index b57950402..92c58a276 100644
--- a/test/test.js
+++ b/test/test.js
@@ -38,6 +38,7 @@
       noop = function() {},
       params = root.arguments,
       push = arrayProto.push,
+      Set = root.Set,
       slice = arrayProto.slice,
       system = root.system,
       toString = objectProto.toString,
@@ -339,8 +340,9 @@
     function createToString(funcName) {
       return _.constant(nativeString.replace(reToString, funcName));
     }
-    // load ES6 Set shim
+    // load ES6 Set and WeakMap shims
     require('./asset/set');
+    require('./asset/weakmap');
 
     // expose `baseEach` for better code coverage
     if (isModularize && !isNpm) {
@@ -443,6 +445,12 @@
       };
     }()));
 
+    if (Set) {
+      setProperty(root, 'Set', _.noop);
+    }
+    if (WeakMap) {
+      setProperty(root, 'WeakMap', _.noop);
+    }
     // fake `WinRTError`
     setProperty(root, 'WinRTError', Error);
 
@@ -485,6 +493,16 @@
     } else {
       delete root.ArrayBuffer;
     }
+    if (Set) {
+      setProperty(root, 'Set', Set);
+    } else {
+      delete root.Set;
+    }
+    if (WeakMap) {
+      setProperty(root, 'WeakMap', WeakMap);
+    } else {
+      delete root.WeakMap;
+    }
     delete root.WinRTError;
     delete root.window;
     delete funcProto._method;