A short introduction to BDD

BDD from the eyes of a test-first maniac.

http://www.meetup.com/Polish-Developers-in-London/events/191397892/

Transcript

1. A short introduction to BDD
   (BDD from the eyes of a test-first maniac)
   by Jakub Zalas
   Polish Developers Meetup
   in London
   

   View Slide

2. @jakzal
   @jakub_zalas
   @SensioLabsUK
   £
   

   View Slide

3. Act 1: Going inside out
   or how it all started
   

   View Slide

4. Test Driven Development
   

   View Slide

5. Test Driven Development
   Introducing BDD, Dan North
   http://dannorth.net/introducing-bdd/
   

   View Slide

6. Test Driven Development
   Behaviour
   Introducing BDD, Dan North
   http://dannorth.net/introducing-bdd/
   

   View Slide

7. public class DeliveryRepositoryTest extends TestCase {
   public void testFindDelivery() {
   // ...
   }
   public void testFindDelivery2() {
   // ...
   }
   }
   

   View Slide

8. public class DeliveryRepositoryTest extends TestCase {
   public void testFindsDeliveryByTrackingCode() {
   // ...
   }
   public void testFailsForInvalidTrackingCode() {
   // ...
   }
   }
   DeliveryRepository
   •  finds delivery by tracking code
   •  fails for invalidtracking code
   

   View Slide

9. public class DeliveryControllerTest extends WebTestCase {
   public void testItShowsDeliveryDetailsForAValidTrackingCode() {
   // ...
   }
   public void testItDoesNotShowADeliveryForExpiredTrackingCode() {
   // ...
   }
   public void testItDoesNotShowADeliveryDeliveredMoreThanAMonthAgo() {
   // ...
   }
   }
   DeliveryController
   •  it shows delivery details for a valid tracking code
   •  it does not show a delivery for expired tracking code
   •  it does not show a delivery delivered more than a month ago
   

   View Slide

10. Act 2: Improving communication
    or how I thought I got it right
    

    View Slide

11. Customers should be able to
    sign in!
    Avatars generated on http://www.customsouthparks.com/
    

    View Slide

12. 1. Open a browser
    2. Put the site URL in the browser and press enter
    3. Give username
    4. Give password
    5. Press submit button
    6. Check if I gained access to the secured area
    

    View Slide

13. package poldev.controller;
    public class AuthController
    {
    public void signIn()
    {
    // ...
    }
    }
    

    View Slide

14. Signing in
    

    View Slide

15. As a Customer
    I want to sign in
    In order to be signed in
    

    View Slide

16. As a Customer
    I want to sign in
    In order to be signed in track my deliveries
    

    View Slide

17. As an Customer Owner
    I want to sign in
    In order to be signed in track my deliveries
    

    View Slide

18. As an Customer Owner
    I want to sign in Customers to sign in
    In order to be signed in track my their deliveries
    

    View Slide

19. When an anonymous user goes to the deliveries
    page
    Then he should see the signin form
    And he shouldn't see any delivery details
    

    View Slide

20. When a Customer goes to the deliveries page
    And gives his login details
    Then he should see a list of his deliveries
    

    View Slide

21. Feature: Tracking deliveries
    As a Customer
    I need to see a status of my delivery
    So I could know when it's going to be delivered
    

    View Slide

22. Feature: Tracking deliveries
    As a Customer
    I need to see a status of my delivery
    So I could know when it's going to be delivered
    

    View Slide

23. Feature: Tracking deliveries
    As a Customer
    I need to see a status of my delivery
    So I could know when it's going to be delivered
    Scenario: Clicking a tracking URL
    Scenario: Clicking a tracking URL month after delivery
    

    View Slide

24. Feature: Tracking deliveries
    As a Customer
    I need to see a status of my delivery
    So I could know when it's going to be delivered
    Scenario: Clicking a tracking URL
    Given I am waiting for a delivery
    And I received a confirmation message
    When I click the tracking URL from the message
    Then I should see a status of my delivery
    Scenario: Clicking a tracking URL month after delivery
    Given I my package was delivered a month ago
    And I kept the confirmation message
    When I click the tracking URL from the message
    Then I should be informed the tracking URL has expired
    

    View Slide

25. Feature: Tracking deliveries
    As a Customer
    I need to see a status of my delivery
    So I could know when it's going to be delivered
    Scenario: Clicking a tracking URL
    Given I am waiting for a delivery
    And I received a confirmation message
    When I click the tracking URL from the message
    Then I should see a status of my delivery
    Scenario: Clicking a tracking URL month after delivery
    Given I my package was delivered a month ago
    And I kept the confirmation message
    When I click the tracking URL from the message
    Then I should be informed the tracking URL has expired
    

    View Slide

26. Failing
    step
    Failing
    test
    Code
    Refactor
    Passing
    step
    External quality
    Internal quality
    

    View Slide

27. Act 3: Going outside in
    or focusing on a goal
    

    View Slide

28. "I need Customers to sign into the
    site to track their delivery."
    Mr Client
    

    View Slide

29. As a Customer
    I need to sign into the site
    So I could track my delivery
    

    View Slide

30. As a Customer
    I need to see my deliveries
    So I could know when it's going to
    be delivered
    

    View Slide

31. WHAT'S
    THE GOAL?
    

    View Slide

32. THE CLIENT
    CAME WITH A
    SOLUTION
    

    View Slide

33. "I need users to sign into the site to track their
    delivery."
    "Why?"
    "So they could see where's their package."
    "Why?"
    "What do you mean? They need to track their
    deliveries."
    "Yes, but why?"
    

    View Slide

34. "Well, our mission is to offer the most
    customer friendly courier services. We want to
    increase the number of satisfied customers."
    "Aha!"
    "So they wouldn't get impatient and file
    complaints when the delivery is delayed."
    "Why?"
    "So they could know when is it going to be
    delivered."
    "Why?"
    

    View Slide

35. < 5% of
    customers
    filing
    complaints
    Customers
    Support
    Notifications
    Contact the Customer
    if delivery is delayed
    Add expected delivery
    time to the
    confirmation message
    SMS notifications
    Add a tracking URL to
    the confirmation
    message
    E-mail notifications
    List of deliveries after
    signing in
    Prevent
    complaints
    Check delivery
    status
    Why? Who? How? What?
    

    View Slide

36. MAKE
    IMPACTS
    NOT
    SOFTWARE
    Gojko Adžić
    impactmapping.org
    

    View Slide

37. Thank you!
    

    View Slide

38. Credits
    •  https://www.flickr.com/photos/hinkelstone/5166544084
    •  http://www.customsouthparks.com/
    •  http://impactmapping.org
    •  http://dannorth.net/introducing-bdd/
    

    View Slide