[PHPCon 2023] Blaski i cienie BDD

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

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

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

6
BDD

7
BDD
$$$

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

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

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BDD is too complex at first sight

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/
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The goal of BDD is a
SMART GOAL

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

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

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

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

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);
}
}

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<?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);
}
}

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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
/**
* @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
/**
*/
{
}
JUST DO IT!

40
BUT REMEMBER...
/**
*/
{
}
/**
* @Transform /^"([^"]+)" product(?:|s)$/
*/
public function getProductByName(string $productName): ProductInterface
{
return $this->productRepository->findOneByName($productName, $this->locale);
}

41
BUT REMEMBER...
/**
*/
{
}
/**
*/
{
}
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
BUT REMEMBER...
/**
*/
{
}
/**
*/
{
}
{
{
}
{
}
}
class SharedStorage implements SharedStorageI
{
private array $clipboard = [];
private ?string $latestKey = null;

/**
*/
{
}
/**
*/
{
}
{
{
}
{
}
}
class SharedStorage implements SharedStorageI
{
private array $clipboard = [];
private ?string $latestKey = null;
43

It’s hard to start
And it’s ok
47

Probably not for every project
48

But I do not
like PHPSpec...
51

BDD IS NOT ABOUT THE SPECIFIC TOOL
52

So it seems it’s not so cool...
53

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

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

SPEED UP
THE DEVELOPMENT
DELIVERING
RELIABLE VALUE
57

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BOTH TECHNICALLY AND BUSINESSLY

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COEXIST WITH OTHER AGILE
METHODOLOGIES

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

Mateusz Zalewski
@CommerceWeavers @Sylius

THANK YOU
@CommerceWeavers
Mateusz Zalewski
WE’RE
HIRING!

[PHPCon 2023] Blaski i cienie BDD

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