code: public function returnsAt($timing, $method, $value, $args = false)
      {
          $this->dieOnNoMethod($method, 'set return value sequence');
          $this->actions->registerAt($timing, $method, $args, new SimpleReturn($value));
      }
docs: Sets a return for a parameter list that
  will be passed only when the required call count is reached.
  
  @param int $timing       Number of calls in the future to which the result applies.
  If not set then all calls will return the value.
  @param string $method    Method name.
  @param mixed $value      Result of call passed.
  @param array $args       List of parameters to match including wildcards.