Update tests.

test/util/assert.js

@@ -0,0 +1,17 @@
+(function () {
+'use strict';
+
+var assert = chai.assert;
+
+assert.lengthOfKeys = function (val, count, msg) {
+
+    var keyCount = _.keys(val).length;
+    assert(keyCount === count, msg ? msg : 'expected ' + val + ' to have ' + count + ' keys, but has ' + keyCount);
+};
+
+assert.isPlainObject = function (val, msg) {
+
+    assert($.isPlainObject(val), msg ? msg : 'expected ' + val + ' to be a plain Object');
+};
+
+}());