code: function (actual, message) {
          YUITest.Assert._increment();
          if (false !== actual) {
              throw new YUITest.ComparisonFailure(YUITest.Assert._formatMessage(message, "Value should be false."), false, actual);
          }
      }
docs: ------------------------------------------------------------------------- Boolean Assertion Methods ------------------------------------------------------------------------- 
  Asserts that a value is false. This uses the triple equals sign
  so no type cohersion may occur.
  @param {Object} actual The actual value to test.
  @param {String} message (Optional) The message to display if the assertion fails.
  @method isFalse
  @static