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Howto(finally)startdoing
DDDbyusingBDD
KacperGunia@cakper
So!ware Engineer
@SensioLabsUK / @Inviqa
PHPers Silesia
@PHPersPL
WhatisBDD?
Bug-driven
Development;)
Behaviour-driven development is about
implementing an application
by describing its behaviour
from the perspective of its
stakeholders.
-- Dan North
BDD is about establishing
a shared understanding of “done”
working from the outside in
until you get there
-- Dan North
BDDshowsyouwhattodonext
akaTechnicalDiscipline
HowdoweBDD?
Feature: Traveler searches for cheap itineraries
In order to save money while travelling
As a world traveler
I want to search for the cheapest itinerary
Productownerwritesscenario
anddeveloperautomatesit
Developerwritesscenario
andthenautomatesit
No!
BDDisaboutcommunication!
flickr.com/photos/dvids/5638829762
How to (finally) start doing DDD by using BDD
Scenario: Successfully find cheapest direct flight
Given the flight from "WAW" to "LHR" priced $30 was scheduled
And the flight from "WAW" to "LHR" priced $50 was scheduled
When I open the "/search" page
And I fill "WAW" in the "Departure airport" field
And I fill "LHR" in the "Destination airport" field
And I click "Search"
Then I should be redirected to "/results" page
And I should see $30 in the "#cheapest-flight-price" block
How to (finally) start doing DDD by using BDD
How to (finally) start doing DDD by using BDD
Scenario: Successfully find cheapest direct flight
Given the flight from "WAW" to "LHR" priced $30 was scheduled
And the flight from "WAW" to "LHR" priced $50 was scheduled
When I open the "/search" page
And I fill "WAW" in the "Departure airport" field
And I fill "LHR" in the "Destination airport" field
And I click "Search"
Then I should be redirected to "/results" page
And I should see $30 in the "#cheapest-flight-price" block
How to (finally) start doing DDD by using BDD
Translation
Canwedobetter?
How to (finally) start doing DDD by using BDD
How to (finally) start doing DDD by using BDD
How to (finally) start doing DDD by using BDD
MissionaccomplishedBoys
Wecangohomenow!
flickr.com/photos/dvids/5638829762
How to (finally) start doing DDD by using BDD
How to (finally) start doing DDD by using BDD
Translationagain
Howtofixthat?
DDD
WhatisDDDabout?
It’s about focusing on the domain
and letting it affect the so"ware very
much
-- Jimmy Nilsson
ButWHYdoweneedit?
Everybodyknowsthejargon
intheirOWNFIELD
It'saboutcommon
understanding
Ubiquitouslanguage
How to (finally) start doing DDD by using BDD
How to (finally) start doing DDD by using BDD
How to (finally) start doing DDD by using BDD
Concrete examples are rooted
in the problem domain
-- Matt Wynne
How to (finally) start doing DDD by using BDD
DomainModel
A domain model (...) is not just the
knowledge in a domain expert’s head;
it is a rigorously organized and
selective abstraction of that knowledge
-- Eric Evans
Modeldocuments
theknowledge
Pushing for ubiquitous language hard
enough makes your examples a domain
model
-- Konstantin Kudryashov
Scenario: Successfully find cheapest direct flight
Given the flight from "WAW" to "LHR" priced $30 was scheduled
And the flight from "WAW" to "LHR" priced $50 was scheduled
When I open the "/search" page
And I fill "WAW" in the "Departure airport" field
And I fill "LHR" in the "Destination airport" field
And I click "Search"
Then I should be redirected to "/results" page
And I should see $30 in the "#cheapest-flight-price" block
Scenario: Successfully find cheapest direct itinerary
Given the search for the itinerary schedule
And the itinerary from "WAW" to "LHR" priced $30 was planned in the schedule
And the itinerary from "WAW" to "LHR" priced $50 was planned in the schedule
When I search for cheapest itinerary from "WAW" to "LHR"
Then the cheapest itinerary should cost $30
Modellingbyexample
How to (finally) start doing DDD by using BDD
How to (finally) start doing DDD by using BDD
Phase1
How to (finally) start doing DDD by using BDD
Scenario: Successfully find cheapest direct itinerary
Given the search for the itinerary schedule
And the itinerary from "WAW" to "LHR" priced $30 was planned in the schedule
And the itinerary from "WAW" to "LHR" priced $50 was planned in the schedule
When I search for cheapest itinerary from "WAW" to "LHR"
Then the cheapest itinerary should cost $30
How to (finally) start doing DDD by using BDD
Given the search for the itinerary schedule
/**
* @Given /^the search for the itinerary schedule$/
*/
public function theSearchForTheItinerarySchedule()
{
$this->itinerarySchedule = new ItinerarySchedule();
$this->search = new Search($this->itinerarySchedule);
}
How to (finally) start doing DDD by using BDD
Designemerges
And the itinerary from "WAW" to "LHR"
priced $30 was planned in the schedule
/**
* @Given the itinerary from :fromAirport to :toAirport
* priced $:price was planned in the schedule
*/
public function theItineraryFromToPricedWasPlannedInTheSchedule(
$fromAirport,
$toAirport,
$price
) {
$itinerary = new Itinerary(
Airport::code($fromAirport),
Airport::code($toAirport),
Money::usd($price)
);
$this->itinerarySchedule->plan($itinerary);
}
How to (finally) start doing DDD by using BDD
When I search for cheapest itinerary from "WAW" to "LHR"
/**
* @When I search for cheapest itinerary from :fromAirport to :toAirport
*/
public function iSearchForCheapestItineraryFromTo($fromAirport, $toAirport)
{
$this->cheapestItinerary = $this->search->forCheapest(
Airport::code($fromAirport),
Airport::code($toAirport)
);
}
Then the cheapest itinerary should cost $30
/**
* @Then the cheapest itinerary should cost $:price
*/
public function theCheapestItineraryShouldCost($price)
{
expect($this->cheapestItinerary->cost())->toBeLike(Money::usd($price));
}
How to (finally) start doing DDD by using BDD
How to (finally) start doing DDD by using BDD
Phase2
How to (finally) start doing DDD by using BDD
@ui
Scenario: Successfully find cheapest direct itinerary
Given the search for the itinerary schedule
And the itinerary from "WAW" to "LHR" priced $30 was planned in the schedule
And the itinerary from "WAW" to "LHR" priced $50 was planned in the schedule
When I search for cheapest itinerary from "WAW" to "LHR"
Then the cheapest itinerary should cost $30
Given the search for the itinerary schedule
/**
* @Given the search for the itinerary schedule
*/
public function theSearchForTheItinerarySchedule()
{
$this->visit("/search");
}
And the itinerary from "WAW" to "LHR"
priced $30 was planned in the schedule
/**
* @Given the itinerary from :fromAirport to :toAirport
* priced $:price was planned in the schedule
*/
public function theItineraryFromToPricedWasPlannedInTheSchedule(
$fromAirport,
$toAirport,
$price
) {
$itinerary = new Itinerary(
Airport::code($fromAirport),
Airport::code($toAirport),
Money::usd($price)
);
$this->get("itinerary_schedule")->plan($itinerary);
}
When I search for cheapest itinerary from "WAW" to "LHR"
/**
* @When I search for cheapest itinerary from :fromAirport to :toAirport
*/
public function iSearchForCheapestItineraryFromTo($fromAirport, $toAirport)
{
$this->fillIn("#from-airport", $fromAirport);
$this->fillIn("#to-airport", $toAirport);
$this->clickButton("Search");
}
Then the cheapest itinerary should cost $30
/**
* @Then the cheapest itinerary should cost $:price
*/
public function theCheapestItineraryShouldCost($price)
{
$cheapestItinerary = $this->find("#cheapest-itinerary");
expect($cheapestItinerary)->toContainText(sprintf("From $%s", $price));
}
# behat.yml
default:
suites:
domain:
contexts: [ SearchContext ]
ui:
contexts: [ WebSearchContext ]
filters: { tags: '@ui' }
ModellingbyExample
Inthree(easy)steps
· Have the conversation
· Model your objects
· Go again through UI*
*But
You(really)don't
havetoautomate
everything!
How to (finally) start doing DDD by using BDD
Butthereisa
problem
Weignoredthedepth
ofthedomain
Onpurpose
Youcan'tmodelthe
wholesystemusing
onefeature
How to (finally) start doing DDD by using BDD
Repeattheprocess
andmodelthe
planner
Whatifmodelhasdifferentrequirements
inthiscontext?
BoundedContext
Languageislimited
Search Itinerary
!=
Planner Itinerary
!=
Booking Itinerary
How to (finally) start doing DDD by using BDD
Donotbuildfragilemonoliths!
Buildapplicationswith
Boundedcontextinmind
---Wrapup---
Havethe
conversation
Donotseparatethe
conceptsfromthe
implementation
Youcannotbuild
conceptualmodels
withoutconsidering
implementationissues
Pushfor
Ubiquitouslanguage
UseBehattodriveyourModel
NotonlytheUI
"BDDisabout
conversationsyouhaveto
producesoftware"
"DDDisabouthowyou
exploredomainmodels
andhowyouarticulatethis"
Thanks!
@cakper

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