How can I simulate the browser back button in Capybara?

We have a issue on our e-commerce site where users occasionally hit "checkout" twice and have their card charged twice. It's a common enough bug and easy to fix, but I'd like to test the solution in our capybara setup. Once I've called click_button('checkout'), is it possible for me to pretend I'm a user hitting the browsers back button and then call click_button('checkout') a second time?

[labocho]

でブラウザバック。js有効ドライバで window.history.back()