Rails%203%20In%20Action

Behavior-driven development
all the steps as Givens, but it’s not really readable. Let’s now implement this example
scenario in Cucumber. First, run mkdir -p accounts/features, which, much as in the
RSpec example, creates a directory called accounts and a directory inside of that
called features. In this features directory, create a file called account.feature. In this file,
you write a feature definition, as shown in the following listing.
Listing 2.21 accounts/features/account.feature
Feature: My Account
In order to manage my account
As a money minder
I want to ensure my money doesn't get lost
This listing lays out what this feature is about and is more useful to human readers
(such as stakeholders) than it is to Cucumber.
Next, you put in your scenario underneath the feature definition, as in the following
listing.
Listing 2.22 accounts/features/account.feature
Scenario: Taking out money
Given I have an account
And it has a balance of 100
When I take out 10
Then my balance should be 90
The whole feature should now look like the following listing.
Listing 2.23 accounts/features/account.feature
Feature: My Account
In order to manage my account
As a money minder
I want to ensure my money doesn't get lost
Scenario: Taking out money
Given I have an account
And it has a balance of 100
When I take out 10
Then my balance should be 90
As you can see in listing 2.23, it’s testing the whole stack of the transaction rather than
a single unit. This process is called integration testing. You set the stage by using the Given
steps, play out the scenario using When steps, and ensure that the outcome is as you
expected by using Then steps. The And word is used when you want a step to be defined
in the same way as the previous step, as seen in the first two lines of this scenario.
To run this file, you first need to ensure Cucumber is installed, which you can do
by installing the Cucumber gem: gem install cucumber. When the Cucumber gem is
installed, you can run this feature file by going into the accounts directory and running
cucumber features, as in the next listing.
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