code: function (actual, message) {
          YUITest.Assert._increment();
          if (actual.length > 0){
              YUITest.Assert.fail(YUITest.Assert._formatMessage(message, "Array should be empty."));
          }
      }
docs: Asserts that an array is empty.
  @param {Array} actual The array to test.
  @param {String} message (Optional) The message to display if the assertion fails.
  @method isEmpty
  @static