Asserts that an element has a given class.
SimpleXMLElement $element: The element to test.
string $class: The class to assert.
string $message: (optional) A verbose message to output.
protected function assertClass(SimpleXMLElement $element, $class, $message = NULL) {
if (!isset($message)) {
$message = "Class .{$class} found.";
}
$this
->assertTrue(strpos($element['class'], $class) !== FALSE, $message);
}