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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
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 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
Translation
Canwedobetter?
MissionaccomplishedBoys
Wecangohomenow!
flickr.com/photos/dvids/5638829762
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
Concrete examples are rooted
in the problem domain
-- Matt Wynne
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
Phase1
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->itinerarySchedule = new ItinerarySchedule();
$this->search = new Search($this->itinerarySchedule);
}
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);
}
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));
}
Phase2
@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!
Butthereisa
problem
Weignoredthedepth
ofthedomain
Onpurpose
Youcan'tmodelthe
wholesystemusing
onefeature
Repeattheprocess
andmodelthe
planner
Whatifmodelhasdifferentrequirements
inthiscontext?
BoundedContext
Languageislimited
Search Itinerary
!=
Planner Itinerary
!=
Booking Itinerary
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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