Appetite comes with testing

Appetite comes with testing

“It's a dangerous business, Frodo, going out
your door. You step onto the road, and if you
don't keep your feet, there's no knowing
where you might be swept off to.”
J.R.R. Tolkien, The Lord of the Rings

Change begins with awareness

Defect Cost Increase


Stress cycle


Testing as...

documentation


Testing as...

instrument for
cooperation


Testing as...

instrument for
open source
cooperation


Pair programming


All begins with...

...a need

And...

“Supporting multiple user classes is not easy at all. It would
make the bundle code far more complex as we would
basically need to change all places interacting with the user
to be able to handle all user classes. I don't really want to
go this way (it will also make it more likely to introduce
bugs).”

...a delusion

But...

In Symfony2, all core classes use the service container,
so it is easy to extend, configure and use any object

...a hope

Service Container
Dependency Injection Container

use AcmeHelloBundleMailer;

$mailer = new Mailer('sendmail');
$mailer->send('info@netmeans.net', ... );


Service Container
class Mailer
{
private $mailerType;

public function __construct($mailerType)
{
$this->mailerType = $mailerType
}

public function send($to, ...)
{
...
}
}

services:
my_mailer:
class: AcmeHelloBundleMailer
arguments: [sendmail]


Service Container

class HelloController extends Controller
{
public function sendEmailAction()
{
$mailer = $this->get('my_mailer');
$mailer->send('info@netmeans.net', ... );
}
}


FOSUserBundle
fos_user:
db_driver: orm
firewall_name: main
user_class: AcmeUserBundleEntityUser


FOSUserBundle
fos_user:
db_driver: orm
firewall_name: main
service:
user_manager: custom_user_manager


So ...

We have to create our custom
UserManager that accepts in the
constructor an object that have the
responsibility to discriminate user
types

...a solution

First of all: test

We start writing some functional
tests to check correct integration
of FOSUserBundle


Now we feel good

We can extends FOSUser without pain
improving changes step by step


Custom UserManager

Class UserManager extends FOSUserBundleEntityUserManager
{
protected $userDiscriminator;

public function __construct(..., UserDiscriminator $userDiscriminator)

public function getClass()
{
return $this->userDiscriminator->getClass();
}
}


UserDiscriminator

public function getClass()
{
return 'Acme/UserBundle/Entity/UserOne';
}


From here it's all smooth

With little iterations, we improve
UserManager and UserDiscriminator
with unit and functional tests,
passing from a dirty code to a more
elegant one


NmnMultiUserBundle
fos_user:
db_driver: orm
firewall_name: main
service:
user_manager: nmn_user_manager
registration:
form:
handler: nmn_user_registration_form_handler
profile:
form:
handler: nmn_user_profile_form_handler


NmnMultiUserBundle
parameters:
nmn_user_discriminator_parameters:
classes:
user_one:
entity: AcmeUserBundleEntityUserOne
registration: AcmeUserBundleFormTypeRegistrationUserOneFormType
profile: AcmeUserBundleFormTypeProfileUserOneFormType
factory:
user_two:
entity: AcmeUserBundleEntityUserTwo
registration: AcmeUserBundleFormTypeRegistrationUserTwoFormType
profile: AcmeUserBundleFormTypeProfileUserTwoFormType
factory:


NmnMultiUserBundle

Ok, it is an hack :)

A lazy way to use for free most of the
functionality of FOSUserBundle ...

... but it is ready to be improved by
anyone.


NmnMultiUserBundle

github.com/netmeansnet/NmnMultiUserBundle

github.com/netmeansnet/NmnMultiUserBundleSandbox

travis-ci.org/#!/netmeansnet/NmnMultiUserBundle

@leonardo_nmn

@euxpom


Some Books
The Clean Coder
A code of Conduct for Professional Programmers

Martin, Robert C.

I know this sounds strident and unilateral, but given the record I don't
think the surgeons should have to defend hand-washing, and I don't
think programmers should have to defend TDD


Some Books
Extreme Programming Explained
Embrace Change

Beck, Kent

In software development, “perfect” is a verb, not an adjective
In XP, testing is as important as programming

Some Books
The Grumpy Programmer's Guide To Building
Testable Applications in PHP

Hartjes, Chris

Building testable applications is Hard
The reason for investing in automated testing is obvious: any bugs you
catch before your application makes it into production cost less in terms
of resources (money, developer time) to fix than fixing it into production


Appetite comes with testing

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