code: function priorityFill( callback ) {
  	var queue, prioritizedQueue;
  
  	queue = config.queue.slice( priorityFill.pos );
  	prioritizedQueue = config.queue.slice( 0, -config.queue.length + priorityFill.pos );
  
  	queue.unshift( callback );
  	queue.unshift.apply( queue, prioritizedQueue );
  
  	config.queue = queue;
  
  	priorityFill.pos += 1;
  }
docs: Place previously failed tests on a queue priority line, respecting the order they get assigned.