public static function assertFilterAdded(
        $hook = '',
        callable $callback = null,
        $priority = null,
        $numArgs = null
    ) {
        static::assertHookAdded('filter', $hook, $callback, $priority, $numArgs);
    }
public static function assertFilterAdded(
        $hook = '',
        callable $callback = null,
        $priority = null,
        $numArgs = null
    ) {
        static::assertHookAdded('filter', $hook, $callback, $priority, $numArgs);
    }
public static function assertFilterAdded ( $ hook = '' , callable $ callback = null , $ priority = null , $ numArgs = null ) { static :: assertHookAdded ( 'filter' , $ hook , $ callback , $ priority , $ numArgs ) ; }
Check if a filter is added and throws an exceptions otherwise.

@param string   $hook     Filter hook to check
@param callable $callback Callback to check
@param int      $priority Priority to check
@param int      $numArgs  Number of accepted arguments to check
Check if a filter is added and throws an exceptions otherwise .