Tests that elements are rendered properly.
protected function assertRenderedElement(array $element, $xpath, array $xpath_args = array()) {
$original_element = $element;
$this
->drupalSetContent(drupal_render($element));
$this
->verbose('<pre>' . check_plain(var_export($original_element, TRUE)) . '</pre>' . '<pre>' . check_plain(var_export($element, TRUE)) . '</pre>' . '<hr />' . $this
->drupalGetContent());
// @see Drupal\simpletest\WebTestBase::xpath()
$xpath = $this
->buildXPathQuery($xpath, $xpath_args);
$element += array(
'#value' => NULL,
);
$this
->assertFieldByXPath($xpath, $element['#value'], format_string('#type @type was properly rendered.', array(
'@type' => var_export($element['#type'], TRUE),
)));
}