Using tags to label, organize, and filter our Features

Tags provide an extremely useful way to denote different contexts for our Features. They can be used to group Features together, indicate scope, filter Scenarios, and provide visual clues to our readers. Tags are just words prefixed by the @ symbol. Let's take a look at the following Feature (shortened for brevity):

@order
Feature: Buyer places order
@important
Scenario: Missing delivery address
  Given …
@wip @financial Scenario: Applying discount
  Given …

We have applied the @order tag at the beginning of our Feature. This means that the tag applies to all the Scenarios within that Feature. If we ask a BDD tool, such as Cucumber, to run everything tagged with @order, it will execute both the Missing delivery address and Applying discount scenarios. We could apply the same tag to other Features and Scenarios too, if they were referring to order-related functionality.

We have applied...