Check to see if two values are not equal.
$first: The first value to check.
$second: The second value to check.
$message: (optional) A message to display with the assertion. Do not translate messages: use format_string() to embed variables in the message text, not t(). If left blank, a default message will be displayed.
$group: (optional) The group this message is in, which is displayed in a column in test output. Use 'Debug' to indicate this is debugging output. Do not translate this string. Defaults to 'Other'; most tests do not override this default.
TRUE if the assertion succeeded, FALSE otherwise.
protected function assertNotEqual($first, $second, $message = '', $group = 'Other') {
return $this
->assert($first != $second, $message ? $message : t('Value @first is not equal to value @second.', array(
'@first' => var_export($first, TRUE),
'@second' => var_export($second, TRUE),
)), $group);
}