Add coverage for WeakMap usage.

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__,

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));