What would your application look like if it were written by the people who write the testing frameworks? If unit tests make classes more modular, by forcing you to test it in isolation, then what is the effect of expanding this to a less granular level, the acceptance and functional test. The more modern application architecture evolves, the more we hear the very old patterns being rediscovered and re-adopted. 1979 Trygve's MVC is a classic example, so are the SOLID principles. In this talk we will look on how Symfony allows for a really decoupled, easy to test application, by following on the footsteps of Alistair Cockburn's hexagonal architecture.

1. The Framework as an
Implementation Detail
MarcelloDuarte/KonstantinKudryashov

2. @_md @everzet
a SensioLabsEvent
Aboutus
@_md
MarcelloDuarteHEAD OFTRAINING, INVIQA
@everzet
KonstantinKudryashovBDD PRACTICE MANAGER, INVIQA

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a SensioLabsEvent
Thistalk
[ Convenience ]
[ Choices ]
[ Future ]

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a SensioLabsEvent
Choice
Convenience
http://www.flickr.com/photos/johnwinkelman/6200402992/

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a SensioLabsEvent
We do
love .

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a SensioLabsEvent
Promise
“A framework is‘just’one of the tools to help
you develop better and faster”
– Symfony documentation

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a SensioLabsEvent
“The only way to go fast is to go well”– Uncle Bob
FAST SLOW
QUALITY SWITCH

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a SensioLabsEvent
Relativecostofrepair
analysis design code test support

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a SensioLabsEvent
Convenient
vs
Maintainable

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a SensioLabsEvent
A framework is“convenient”
when it makes choices for you
BookController extends Controller
AuthorsController extends ContainerAwareController

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The code is maintainable when
the framework lets you make
the choices

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Instabilityandabstractness
instability
abstractness

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a SensioLabsEvent
The “convenient”code is usually not
very testable

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a SensioLabsEvent
Symfonycanbeconvenient
public function updateAction($id)
{
$em = $this->getDoctrine()->getManager();
$product = $em->getRepository('AcmeStoreBundle:Product')->find($id);
if (!$product) {
throw $this->createNotFoundException(
'No product found for id '.$id
);
}
$product->setName('New product name!');
$em->flush();
return $this->redirect($this->generateUrl('homepage'));
}

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a SensioLabsEvent
The“convenient”Controller
tends to ask for more
IntegrationTests

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a SensioLabsEvent
IntegrationTests
stinks of coupling

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a SensioLabsEvent
Feedback
Outer Quality
Inner Quality
AcceptanceTests
UnitTests

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a SensioLabsEvent
Choice
Choices
http://www.flickr.com/photos/tmartin/32010732/

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a SensioLabsEvent
Should we alwaysTDD?
what the Start Up said
what the Craftsmen said

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a SensioLabsEvent
We do
Test Driven Design

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a SensioLabsEvent
Design is about choices

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Design is a professional activity

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TDD is about communication

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TDD is about your stakeholders

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The developers in the team are
also stakeholders

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TDD is for long term
relationships

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a SensioLabsEvent
Howmanydependenciescanyouspot?
public function updateAction($id)
{
$em = $this->getDoctrine()->getManager();
$product = $em->getRepository('AcmeStoreBundle:Product')->find($id);
if (!$product) {
throw $this->createNotFoundException(
'No product found for id '.$id
);
}
$product->setName('New product name!');
$em->flush();
return $this->redirect($this->generateUrl('homepage'));
}

28. @_md @everzet
a SensioLabsEvent
Howmanydependenciescanyouspot?
public function updateAction($id)
{
$em = $this->getDoctrine()->getManager();
$product = $em->getRepository('AcmeStoreBundle:Product')->find($id);
if (!$product) {
throw $this->createNotFoundException(
'No product found for id '.$id
);
}
$product->setName('New product name!');
$em->flush();
return $this->redirect($this->generateUrl('homepage'));
}
Doctrine
Redirect
Router
Model

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a SensioLabsEvent
HexagonalArchitecture
“The hexagon is not a hexagon because the number six is
important, but rather to allow the people doing the drawing
to have room to insert ports and adapters as they need”
:)
[Cockburn 08]

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a SensioLabsEvent
http://www.flickr.com/photos/10849858@N00/2696404813

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a SensioLabsEvent
http://www.flickr.com/photos/mac_users_guide/3680586328/

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your
application

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web gui
app
your
application
usersideports
test
adapter

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a SensioLabsEvent
web gui
app
your
application
usersideports
test
adapter
datasideports
dbaccess
service
in
memory
db

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a SensioLabsEvent
HexagonalArchitecture
Db
rest
Logs

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a SensioLabsEvent
DependencyInversion
Higher level modules should not
depend on lower level details
[Martin 02]

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a SensioLabsEvent
Naiveimplementation
controller
use case
utility
uses
uses

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DependencyInversion
use case
service
adapter
utility
adapter
service
utility

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Choice
Let’sseesomecode

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a SensioLabsEvent
Choice
Future

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a SensioLabsEvent
Choice
Thanks!
joind.in/9331
github.com/MarcelloDuarte/hexagonal-symfony