src/Runner.php
public function attach(Runner $runner)
    {
        if ($this->runners->contains($runner)) {
            throw new LogicException('Can\'t attach already attached runner.');
        }

        $this->runners->attach($runner);

        return $this;
    }
public function attach(Runner $runner)
    {
        if ($this->runners->contains($runner)) {
            throw new LogicException('Can\'t attach already attached runner.');
        }

        $this->runners->attach($runner);

        return $this;
    }
Attaches a runner.

@param Runner $runner

@return $this