Behaviour-driven development jest wspaniałe, czyż nie? Poprawia komunikacja w Zespole, sprawia że wymagania biznesowe są zrozumiałe dla wszystkich zaangażowanych w projekt, przyspiesza development w dłuższym okresie… Po prostu nie ma wad! Albo… jednak ma? Niestety, nie ma idealnych systemów czy idealnych metodologii. Wszystkie mają swoje minusy - kompromisy, na które musimy się zgodzić kiedy implementujemy je w naszych procesach. I nie ma w tym nic złego, dopóki jesteśmy ich świadomi. Pracując przez wiele lat z Syliusem pokochałem BDD, TDD, czy podejście test-driven jako takie, ale zrozumiałem też koszt ich użycia w innych projektach. Prezentacja skupia się na plusach i minusach metodologii BDD, z perspektywy członka Core Teamu dużego, open-source’owego projektu. Stara się również pochylić nad perspektywą przeciętnego użytkownika takiego produktu… która może być jednocześnie podobna jak i zaskakująco odmienna.

1. Lights and shadows of BDD

2. 2
2

3. 3 https://www.freepik.com/icon/black-hole_3061985
3

4. 4
?
https://www.freepik.com/icon/black-hole_3061985
4

5. 5
5
BDD IS THE ULTIMATE THEORY
OF DEVELOPMENT PROCESSES
(KIND OF)

6. 6 https://www.freepik.com/icon/black-hole_3061985
6
BDD

7. 7 https://www.freepik.com/icon/black-hole_3061985
7
BDD
$$$

8. MISCONCEPTIONS
8

9. Better TDD
9
TDD on steroids
BDD tests
TDD with
different naming
BDD is UI testing

10. 10
BDD is a way for software teams to work that closes the gap
between business people and technical people
https://cucumber.io/docs/bdd/
Behaviour-driven development is an “outside-in” methodology. It starts
at the outside by identifying business outcomes, and then drills
down into the feature set that will achieve those outcomes.
https://dannorth.net/whats-in-a-story/
BDD is a process designed to aid the management and the delivery of software
development projects by improving communication between engineers
and business professionals. https://inviqa.com/blog/bdd-guide

11. 11
BDD is too complex at first sight

12. TDD is conceptually simple
12

13. ClassRemapping=PecanGame.PecanSeqAct_AttachXenoToTether ->
PecanGame.PecanSeqAct_AttachPawnToTeather
ClassRemapping=PecanGame.PecanSeqAct_AttachXenoToTether ->
PecanGame.PecanSeqAct_AttachPawnToTether
https://www.reddit.com/r/Games/comments/8yp1um/modder_fixes_alien_colonial_marines_by_fixing_a/
13

14. RED
14
GREEN
REFACTOR

15. 15
The goal of BDD is a
SMART GOAL

16. 16
The goal of BDD is a
SMART GOAL
specific measurable attainable relevant time-bound
https://inviqa.com/blog/bdd-guide

17. Test-Driven Development focused on WHY
17 https://www.toptal.com/freelance/your-boss-won-t-appreciate-tdd-try-bdd
BDD (over)simplified:
~=

18. 18
BDD is too natural

19. 19

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21. 21

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24. 24

25. 25
I’m here to write code, not tales 😡

26. BAD EXAMPLES
26

27. 27

28. 28 https://docs.behat.org/en/latest/user_guide/writing_scenarios.html

29. 29
BEHAT
PHPUNIT

30. 30

31. It’s hard to start
31

32. 32

33. 33

34. 34

35. 35
<?php
declare(strict_types=1);
namespace specSyliusBundleCoreBundleEventListener;
use …
final class CustomerDefaultAddressListenerSpec extends ObjectBehavior
{
function it_adds_the_address_as_default_to_the_customer_on_pre_create_resource_controller_event(
ResourceControllerEvent $event,
AddressInterface $address,
CustomerInterface $customer,
): void {
$event->getSubject()->willReturn($address);
$address->getCustomer()->willReturn($customer);
$customer->getDefaultAddress()->willReturn(null);
$customer->setDefaultAddress($address)->shouldBeCalled();
$this->preCreate($event);
}
}

36. 36
<?php
declare(strict_types=1);
namespace specSyliusBundleCoreBundleEventListener;
use …
final class CustomerDefaultAddressListenerSpec extends ObjectBehavior
{
function it_adds_the_address_as_default_to_the_customer_on_pre_create_resource_controller_event(
ResourceControllerEvent $event,
AddressInterface $address,
CustomerInterface $customer,
): void {
$event->getSubject()->willReturn($address);
$address->getCustomer()->willReturn($customer);
$customer->getDefaultAddress()->willReturn(null);
$customer->setDefaultAddress($address)->shouldBeCalled();
$this->preCreate($event);
}
}

37. 37
Scenario: Having cart maintained after logging in
When I add "Stark T-Shirt" product to the cart
And I log in as "robb@stark.com" with "KingInTheNorth" password
And I see the summary of my cart
Then there should be one item in my cart
And this item should have name "Stark T-Shirt"

38. 38
/**
* @Given /^I (?:add|added) ("[^"]+" product) to the (cart)$/
*/
public function iAddProductToTheCart(ProductInterface $product): void
{
$this->productShowPage->open(['slug' => $product->getSlug()]);
$this->productShowPage->addToCart();
$this->sharedStorage->set('product', $product);
}

39. 39
/**
* @Given /^I (?:add|added) ("[^"]+" product) to the (cart)$/
*/
public function iAddProductToTheCart(ProductInterface $product): void
{
$this->productShowPage->open(['slug' => $product->getSlug()]);
$this->productShowPage->addToCart();
$this->sharedStorage->set('product', $product);
}
JUST DO IT!

40. 40
BUT REMEMBER...
/**
* @Given /^I (?:add|added) ("[^"]+" product) to the (cart)$/
*/
public function iAddProductToTheCart(ProductInterface $product): void
{
$this->productShowPage->open(['slug' => $product->getSlug()]);
$this->productShowPage->addToCart();
$this->sharedStorage->set('product', $product);
}
/**
* @Transform /^"([^"]+)" product(?:|s)$/
*/
public function getProductByName(string $productName): ProductInterface
{
return $this->productRepository->findOneByName($productName, $this->locale);
}

41. 41
BUT REMEMBER...
/**
* @Given /^I (?:add|added) ("[^"]+" product) to the (cart)$/
*/
public function iAddProductToTheCart(ProductInterface $product): void
{
$this->productShowPage->open(['slug' => $product->getSlug()]);
$this->productShowPage->addToCart();
$this->sharedStorage->set('product', $product);
}
/**
* @Transform /^"([^"]+)" product(?:|s)$/
*/
public function getProductByName(string $productName): ProductInterface
{
return $this->productRepository->findOneByName($productName, $this->locale);
}
class ShowPage extends SymfonyPage implements ShowPageInterface
{
public function getRouteName(): string
{
return 'sylius_shop_product_show';
}
public function addToCart(): void
{
$this->getElement('add_to_cart_button')->click();
$this->waitForCartSummary();
}
}

42. 42
BUT REMEMBER...
/**
* @Given /^I (?:add|added) ("[^"]+" product) to the (cart)$/
*/
public function iAddProductToTheCart(ProductInterface $product): void
{
$this->productShowPage->open(['slug' => $product->getSlug()]);
$this->productShowPage->addToCart();
$this->sharedStorage->set('product', $product);
}
/**
* @Transform /^"([^"]+)" product(?:|s)$/
*/
public function getProductByName(string $productName): ProductInterface
{
return $this->productRepository->findOneByName($productName, $this->locale);
}
class ShowPage extends SymfonyPage implements ShowPageInterface
{
public function getRouteName(): string
{
return 'sylius_shop_product_show';
}
public function addToCart(): void
{
$this->getElement('add_to_cart_button')->click();
$this->waitForCartSummary();
}
}
class SharedStorage implements SharedStorageI
{
private array $clipboard = [];
private ?string $latestKey = null;

43. /**
* @Given /^I (?:add|added) ("[^"]+" product) to the (cart)$/
*/
public function iAddProductToTheCart(ProductInterface $product): void
{
$this->productShowPage->open(['slug' => $product->getSlug()]);
$this->productShowPage->addToCart();
$this->sharedStorage->set('product', $product);
}
/**
* @Transform /^"([^"]+)" product(?:|s)$/
*/
public function getProductByName(string $productName): ProductInterface
{
return $this->productRepository->findOneByName($productName, $this->locale);
}
class ShowPage extends SymfonyPage implements ShowPageInterface
{
public function getRouteName(): string
{
return 'sylius_shop_product_show';
}
public function addToCart(): void
{
$this->getElement('add_to_cart_button')->click();
$this->waitForCartSummary();
}
}
class SharedStorage implements SharedStorageI
{
private array $clipboard = [];
private ?string $latestKey = null;
43

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46. 46

47. It’s hard to start
And it’s ok
47

48. Probably not for every project
48

49. 49

50. 50

51. But I do not
like PHPSpec...
51

52. BDD IS NOT ABOUT THE SPECIFIC TOOL
52

53. So it seems it’s not so cool...
53

54. So it seems it’s not so cool...
54
IT IS!

55. SPEED UP
THE DEVELOPMENT
55

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22
24
26
28
30
1 2 3
with TDD no TDD
http://codemanship.co.uk/slow_and_dirty_with_callouts.pdf

57. SPEED UP
THE DEVELOPMENT
DELIVERING
RELIABLE VALUE
57

58. 58
BOTH TECHNICALLY AND BUSINESSLY

59. 59
$ UNDERSTANDING

60. 60
COGNITIVE DIVERSITY

61. 61
LIVING DOCUMENTATION
61

62. 62
SAFETY + NO REGRESSION

63. 63
COEXIST WITH OTHER AGILE
METHODOLOGIES

64. CODING EXPERIENCE
64

65. @mpzalewski Zales0123
https://mpzalewski.com
Mateusz Zalewski

66. @mpzalewski Zales0123
https://mpzalewski.com
Mateusz Zalewski
@CommerceWeavers @Sylius

67. @mpzalewski Zales0123
https://mpzalewski.com
Mateusz Zalewski

68. THANK YOU
@CommerceWeavers
@mpzalewski Zales0123
https://mpzalewski.com
Mateusz Zalewski
WE’RE
HIRING!