public function elementNotExists($selectorType, $selector, ElementInterface $container = null)
    {
        $container = $container ?: $this->session->getPage();
        $node = $container->find($selectorType, $selector);

        $message = sprintf(
            'An %s appears on this page, but it should not.',
            $this->getMatchingElementRepresentation($selectorType, $selector)
        );

        $this->assert(null === $node, $message);
    }