Adding a test suite for WeakMap.

tests/index.html

@@ -4,14 +4,14 @@
 Use of this source code is governed by a BSD-style
 license that can be found in the LICENSE file.
 -->
-<title>PointerEvent tests</title>
+<title>WeakMap tests</title>
 <meta charset="UTF8">
 <!-- Mocha -->
 <link rel="stylesheet" href="../node_modules/mocha/mocha.css">
 <script src="../node_modules/mocha/mocha.js"></script>
 <!-- Chai -->
 <script src="../node_modules/chai/chai.js"></script>
-<!-- PointerEvents -->
+<!-- WeakMap -->
 <script src="../weakmap.js"></script>
 <!-- Test Setup -->
 <div id="mocha"></div>
@@ -22,6 +22,41 @@
   });
 </script>
 <!-- Tests -->
+<script>
+  suite('WeakMap', function() {
+
+    var assert = chai.assert;
+
+    test('WeakMap has get and set functions', function() {
+      assert.isDefined(WeakMap.prototype.get);
+      assert.isDefined(WeakMap.prototype.set);
+    });
+
+    test('WeakMap\'s get and set perform as expected', function() {
+      var wm = new WeakMap();
+
+      var o1 = {};
+      var o2 = function(){};
+      var o3 = window;
+
+      wm.set(o1, 37);
+      wm.set(o2, 'aoeui');
+
+      assert.equal(wm.get(o1), 37);
+      assert.equal(wm.get(o2), 'aoeui');
+
+      wm.set(o1, o2);
+      wm.set(o3, undefined);
+
+      assert.deepEqual(wm.get(o1), o2);
+      // `wm.get({})` should return undefined, because there is no value for
+      // the object on wm
+      assert.equal(wm.get({}), undefined);
+      // `wm.get(o3)` should return undefined, because that is the set value
+      assert.equal(wm.get(o3), undefined);
+    });
+  });
+</script>
 <!-- Run Mocha -->
 <script>
   mocha.run();