runner.rb

    def tap_pin(pin)
      set_pin(pin, :on)
      set_pin_in(pin, :off, 0.25)
    end

    def set_pin(pin, state)
      return if read_pin(pin) == state

      pin.send(state)
    end

    def set_pin_in(pin, state, seconds)
      Thread.new {
        sleep seconds
        set_pin pin, state
      }
    end

runner_spec.rb

    it "defines an open_close method that taps the pin" do
      pin = runner.pins[:open_close]

      expect(pin).to receive(:on)
      expect(runner).to receive(:set_pin_in).with(pin, :off, 0.25)

      runner.open_close
    end