Like the sample in last chapter, we need to add "buy_book.feature" under "features" folder.
cd features
touch buy_book.feature
Then we need to add following content to it.
Feature:
In order to purchase it later
As a consumer
I want to add a book to my shopping cart
Scenario: Consumer can add a book to shopping cart
Given I open "http://www.amazon.com"
When I search for "The Lean Startup"
And I open the first book
And I add the first book to shopping cart
Then I should see the book in my shopping cart