Pass if the text is found ONLY ONCE on the text version of the page.
The text version is the equivalent of what a user would see when viewing through a web browser. In other words the HTML has been filtered out of the contents.
$text: Plain text to look for.
$message: Message to display.
$group: The group this message belongs to, defaults to 'Other'.
TRUE on pass, FALSE on fail.
protected function assertUniqueText($text, $message = '', $group = 'Other') {
return $this
->assertUniqueTextHelper($text, $message, $group, TRUE);
}