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PHPSpecthe only Design Tool you need
flickr.com/dad/5528226004
Kacper Gunia @cakper
Software Engineer @SensioLabsUK
Symfony Certified Developer
PHPers Silesia @PHPersPL
!
‘Is my code well 

designed?’
’That’s not the way
I would have done it…’
It’s hard to

change!
It’s hard to
change!Rigidity
We're afraid
to change it…
We're
to change itFragility
We cannot

reuse it!
We cannot
reuse it!Immobility
What is
Design
about?
‘The key in making great and
growable systems is much more to
design how its
modules communicate
rather than what their internal
properties and behaviors should be.’
Alan Kay
Design is about
Messaging
$orders	
  =	
  $orderRepository	
  
	
  	
  -­‐>getEntityManager()	
  
	
  	
  	
  -­‐>createOrderQuery($customer)	
  
	
  	
  	
  -­‐>execute();
$orders	
  =	
  $orderRepository	
  
	
  	
  -­‐>findBy($customer);	
  
!
We have
to refactor! :)
We need
two weeks
to refactor! :)
We need
two sprints
to refactor! :|
We need
two months
to refactor! :/
Refactoring
is the process of restructuring
existing code without
changing its external behavior
4 Rules of Simple Design
1. Passes its tests
2. Minimizes duplication
3. Maximizes clarity
4. Has fewer elements
…so we need
to write
Tests!
how
to write
Tests?
Tests
Driven
Development
Red
GreenRefactor
Red
GreenRefactor
But!
How to test
something that
doesn’t exist?
flickr.com/ucumari/580865728/
Test in TDD
means
specification
Specification
describes
behavior
Behavior
Driven
Development
BDD improves
Naming
Conventions
Tools
Story BDD
vs
Spec BDD
Story BDD
description of
business-targeted
application behavior
Spec BDD
specification for
low-level
implementation
http://phpspec.net/
Spec BDD
tool created by
@_md & @everzet
Bundled with
mocking library
Prophecy
But!
Isn’t it a tool just
like PHPUnit?
PHPUnit is a
Testing Tool
PHPSpec is the
Design Tool
class	
  CustomerRepositoryTest	
  extends	
  
PHPUnit_Framework_TestCase	
  
{	
  
	
  	
  	
  	
  function	
  testFindCustomerById()	
  
	
  	
  	
  	
  {	
  
	
  	
  	
  	
  	
  	
  	
  	
  $customerRepository	
  =	
  new	
  CustomerRepository;	
  
!
	
  	
  	
  	
  	
  	
  	
  	
  $customer	
  =	
  $customerRepository-­‐>findById(5);	
  
	
  	
  	
  	
  	
  	
  	
  	
  $this-­‐>assertInstanceOf('Customer',	
  $customer);	
  
	
  	
  	
  	
  }	
  
}
class	
  CustomerRepositorySpec	
  extends	
  ObjectBehavior	
  
{	
  
	
  	
  	
  	
  function	
  it_is_initializable()	
  
	
  	
  	
  	
  {	
  
	
  	
  	
  	
  	
  	
  	
  	
  $this-­‐>shouldHaveType('CustomerRepository');	
  
	
  	
  	
  	
  }	
  
}
Naming
TestCase
!
Specification
Test
!
Example
Assertion
!
Expectation
OK, so how to
specify a method?
What method can do?
return a value
modify state
delegate
throw an exception
Command-Query
Separation
Command
change the state of a system
but do not return a value
Query
return a result and do not
change the state of the
system (free of side effects)
Never both!
class	
  CustomerRepositorySpec	
  extends	
  ObjectBehavior	
  
{	
  
	
  	
  	
  	
  function	
  it_loads_user_preferences()	
  
	
  	
  	
  	
  {	
  
	
  	
  	
  	
  	
  	
  	
  	
  $customer	
  =	
  $this-­‐>findById(5);	
  
!
	
  	
  	
  	
  	
  	
  	
  	
  $customer-­‐>shouldBeAnInstanceOf('Customer');	
  
	
  	
  	
  	
  }	
  
}
Matchers
Type
shouldBeAnInstanceOf(*)
shouldReturnAnInstanceOf(*)
shouldHaveType(*)
$customer-­‐>shouldBeAnInstanceOf('Customer');
Identity ===
shouldReturn(*)
shouldBe(*)
shouldEqual(*)
shouldBeEqualTo(*)
$this-­‐>findById(-­‐1)-­‐>shouldReturn(null);
Comparison ==
shouldBeLike(*)
$this-­‐>getAmount()-­‐>shouldBeLike(5);
Throw
throw(*)->during*()
$this-­‐>shouldThrow(‘InvalidArgumentException’)

	
  	
  	
  	
  	
  -­‐>duringFindByCustomer(null);
Object State
shouldHave*()
$car-­‐>hasEngine();	
  
!
$this-­‐>shouldHaveEngine();
Scalar
shouldBeString()
shouldBeArray()
Count
shouldHaveCount(*)
Or write your own
Inline Matcher
function	
  it_should_have_holland_as_avialable_country()	
  
{	
  
	
  	
  	
  	
  $this-­‐>getCountryCodes()-­‐>shouldHaveValue('NL');	
  
}	
  
!
public	
  function	
  getMatchers()	
  
{	
  
	
  	
  	
  	
  return	
  [	
  
	
  	
  	
  	
  	
  	
  	
  	
  'haveValue'	
  =>	
  function	
  ($subject,	
  $value)	
  {	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  return	
  in_array($value,	
  $subject);	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  }	
  
	
  	
  	
  	
  ];	
  
}
But!
Design is about
Messaging!
And (so far) there
is no messaging…
London School
Mockist TDD
only tested object is real
Test Doubles
Dummy
tested code requires
parameter but
doesn’t need to use it
function	
  let(EntityManager	
  $entityManager)	
  
{	
  
	
  	
  	
  	
  $this-­‐>beConstructedWith($entityManager);	
  
}	
  
!
function	
  it_returns_customer_by_id()	
  
{	
  
	
  	
  	
  	
  $customer	
  =	
  $this-­‐>findById(5);	
  
!
	
  	
  	
  	
  $customer-­‐>shouldBeAnInstanceOf('Customer');	
  
	
  	
  	
  	
  }	
  
}
function	
  let(EntityManager	
  $entityManager)	
  
{	
  
	
  	
  	
  	
  $this-­‐>beConstructedWith($entityManager);	
  
}	
  
!
function	
  it_returns_customer_by_id()	
  
{	
  
	
  	
  	
  	
  $customer	
  =	
  $this-­‐>findById(5);	
  
!
	
  	
  	
  	
  $customer-­‐>shouldBeAnInstanceOf('Customer');	
  
	
  	
  	
  	
  }	
  
}
Stub
provides "indirect input"
to the tested code
function	
  it_bolds_the_output(Stream	
  $stream)	
  
{	
  
	
  	
  	
  	
  $stream-­‐>getOutput()	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>willReturn('DPC');	
  
!
	
  	
  	
  	
  $this-­‐>bold($stream)	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>shouldReturn('<b>DPC</b>’);	
  
}
function	
  it_bolds_the_output(Stream	
  $stream)	
  
{	
  
	
  	
  	
  	
  $stream-­‐>getOutput()	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>willReturn('DPC');	
  
!
	
  	
  	
  	
  $this-­‐>bold($stream)	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>shouldReturn('<b>DPC</b>’);	
  
}
Mocks
verifies "indirect output”
of the tested code
function	
  let(Logger	
  $logger)	
  
{	
  
	
  	
  	
  	
  $this-­‐>beConstructedWith($logger);	
  
}	
  
!
function	
  it_returns_customer_by_id(Logger	
  $logger)	
  
{	
  
	
  	
  	
  	
  $logger-­‐>debug('DB	
  queried')	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>shouldBeCalled();	
  
!
	
  	
  	
  	
  $this-­‐>findById(5);	
  
}
function	
  let(Logger	
  $logger)	
  
{	
  
	
  	
  	
  	
  $this-­‐>beConstructedWith($logger);	
  
}	
  
!
function	
  it_returns_customer_by_id(Logger	
  $logger)	
  
{	
  
	
  	
  	
  	
  $logger-­‐>debug('DB	
  queried')	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>shouldBeCalled();	
  
!
	
  	
  	
  	
  $this-­‐>findById(5);	
  
}
Spy
verifies "indirect output”
by asserting the expectations
afterwards
function	
  let(Logger	
  $logger)	
  
{	
  
	
  	
  	
  	
  $this-­‐>beConstructedWith($logger);	
  
}	
  
!
function	
  it_returns_customer_by_id(Logger	
  $logger)	
  
{	
  
	
  	
  	
  	
  $this-­‐>findById(5);	
  
!
	
  	
  	
  	
  $logger-­‐>debug('DB	
  queried')	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>shouldHaveBeenCalled();	
  
}
function	
  let(Logger	
  $logger)	
  
{	
  
	
  	
  	
  	
  $this-­‐>beConstructedWith($logger);	
  
}	
  
!
function	
  it_returns_customer_by_id(Logger	
  $logger)	
  
{	
  
	
  	
  	
  	
  $this-­‐>findById(5);	
  
!
	
  	
  	
  	
  $logger-­‐>debug('DB	
  queried')	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>shouldHaveBeenCalled();	
  
}
(a bit more)
complex example
function	
  let(SecurityContext	
  $securityContext)	
  {	
  
	
  	
  	
  	
  $this-­‐>beConstructedWith($securityContext);	
  	
  
}	
  
!
function	
  it_loads_user_preferences(	
  
	
  	
  	
  	
  GetResponseEvent	
  $event,	
  SecurityContext	
  $securityContext,	
  	
  
	
  	
  	
  	
  TokenInterface	
  $token,	
  User	
  $user)	
  	
  
{	
  
	
  	
  	
  	
  $securityContext-­‐>getToken()-­‐>willReturn($token);	
  
	
  	
  	
  	
  $token-­‐>getUser()-­‐>willReturn($user);	
  
!
	
  	
  	
  	
  $user-­‐>setPreferences(Argument::type('Preferences'))	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>shouldBeCalled();	
  
!
	
  	
  	
  	
  $this-­‐>handle($event);	
  	
  
}
function	
  let(SecurityContext	
  $securityContext)	
  {	
  
	
  	
  	
  	
  $this-­‐>beConstructedWith($securityContext);	
  	
  
}	
  
!
function	
  it_loads_user_preferences(	
  
	
  	
  	
  	
  GetResponseEvent	
  $event,	
  SecurityContext	
  $securityContext,	
  	
  
	
  	
  	
  	
  TokenInterface	
  $token,	
  User	
  $user)	
  	
  
{	
  
	
  	
  	
  	
  $securityContext-­‐>getToken()-­‐>willReturn($token);	
  
	
  	
  	
  	
  $token-­‐>getUser()-­‐>willReturn($user);	
  
!
	
  	
  	
  	
  $user-­‐>setPreferences(Argument::type('Preferences'))	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>shouldBeCalled();	
  
!
	
  	
  	
  	
  $this-­‐>handle($event);	
  	
  
}
function	
  let(SecurityContext	
  $securityContext)	
  {	
  
	
  	
  	
  	
  $this-­‐>beConstructedWith($securityContext);	
  	
  
}	
  
!
function	
  it_loads_user_preferences(	
  
	
  	
  	
  	
  GetResponseEvent	
  $event,	
  SecurityContext	
  $securityContext,	
  	
  
	
  	
  	
  	
  TokenInterface	
  $token,	
  User	
  $user)	
  	
  
{	
  
	
  	
  	
  	
  $securityContext-­‐>getToken()-­‐>willReturn($token);	
  
	
  	
  	
  	
  $token-­‐>getUser()-­‐>willReturn($user);	
  
!
	
  	
  	
  	
  $user-­‐>setPreferences(Argument::type('Preferences'))	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>shouldBeCalled();	
  
!
	
  	
  	
  	
  $this-­‐>handle($event);	
  	
  
}
function	
  let(SecurityContext	
  $securityContext)	
  {	
  
	
  	
  	
  	
  $this-­‐>beConstructedWith($securityContext);	
  	
  
}	
  
!
function	
  it_loads_user_preferences(	
  
	
  	
  	
  	
  GetResponseEvent	
  $event,	
  SecurityContext	
  $securityContext,	
  	
  
	
  	
  	
  	
  TokenInterface	
  $token,	
  User	
  $user)	
  	
  
{	
  
	
  	
  	
  	
  $securityContext-­‐>getToken()-­‐>willReturn($token);	
  
	
  	
  	
  	
  $token-­‐>getUser()-­‐>willReturn($user);	
  
!
	
  	
  	
  	
  $user-­‐>setPreferences(Argument::type('Preferences'))	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>shouldBeCalled();	
  
!
	
  	
  	
  	
  $this-­‐>handle($event);	
  	
  
}
function	
  let(SecurityContext	
  $securityContext)	
  {	
  
	
  	
  	
  	
  $this-­‐>beConstructedWith($securityContext);	
  	
  
}	
  
!
function	
  it_loads_user_preferences(	
  
	
  	
  	
  	
  GetResponseEvent	
  $event,	
  SecurityContext	
  $securityContext,	
  	
  
	
  	
  	
  	
  TokenInterface	
  $token,	
  User	
  $user)	
  	
  
{	
  
	
  	
  	
  	
  $securityContext-­‐>getToken()-­‐>willReturn($token);	
  
	
  	
  	
  	
  $token-­‐>getUser()-­‐>willReturn($user);	
  
!
	
  	
  	
  	
  $user-­‐>setPreferences(Argument::type('Preferences'))	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>shouldBeCalled();	
  
!
	
  	
  	
  	
  $this-­‐>handle($event);	
  	
  
}
But mocking
becomes painful…
And it smells…
Law of Demeter
unit should only
talk to its friends;
don't talk to strangers
It’s time to
refactor! :)
function	
  it_loads_user_preferences(	
  
	
  	
  	
  	
  GetResponseEvent	
  $event,	
  	
  
	
  	
  	
  	
  SecurityContext	
  $securityContext,	
  	
  
	
  	
  	
  	
  TokenInterface	
  $token,	
  User	
  $user)	
  	
  
{	
  
	
  	
  	
  	
  $securityContext-­‐>getToken()-­‐>willReturn($token);	
  
	
  	
  	
  	
  $token-­‐>getUser()-­‐>willReturn($user);	
  
!
	
  	
  	
  	
  $user-­‐>setPreferences(Argument::type('Preferences'))	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>shouldBeCalled();	
  
!
	
  	
  	
  	
  $this-­‐>handle($event);	
  	
  
}
function	
  it_returns_user_from_token(	
  
	
  	
  	
  	
  SecurityContext	
  $securityContext,	
  	
  
	
  	
  	
  	
  TokenInterface	
  $token,	
  User	
  $user)	
  
{	
  
	
  	
  	
  	
  $securityContext-­‐>getToken()-­‐>willReturn($token);	
  
	
  	
  	
  	
  $token-­‐>getUser()-­‐>willReturn($user);	
  
!
	
  	
  	
  	
  $this-­‐>getUser()-­‐>shouldReturn($user);	
  
}	
  
!
public	
  function	
  __construct(SecurityContext	
  $securityContext){	
  
	
  	
  	
  	
  $this-­‐>securityContext	
  =	
  $securityContext;	
  
}	
  
!
public	
  function	
  getUser()	
  
{	
  
	
  	
  	
  	
  $token	
  =	
  $this-­‐>securityContext-­‐>getToken();	
  
	
  	
  	
  	
  if	
  ($token	
  instanceof	
  TokenInterface)	
  {	
  
	
  	
  	
  	
  	
  	
  	
  	
  return	
  $token-­‐>getUser();	
  
	
  	
  	
  	
  }	
  
!
	
  	
  	
  	
  return	
  null;	
  
}
function	
  it_loads_user_preferences(	
  
	
  	
  	
  	
  GetResponseEvent	
  $event,	
  	
  
	
  	
  	
  	
  SecurityContext	
  $securityContext,	
  	
  
	
  	
  	
  	
  TokenInterface	
  $token,	
  User	
  $user)	
  	
  
{	
  
	
  	
  	
  	
  $securityContext-­‐>getToken()-­‐>willReturn($token);	
  
	
  	
  	
  	
  $token-­‐>getUser()-­‐>willReturn($user);	
  
!
	
  	
  	
  	
  $user-­‐>setPreferences(Argument::type('Preferences'))	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>shouldBeCalled();	
  
!
	
  	
  	
  	
  $this-­‐>handle($event);	
  	
  
}
function	
  it_loads_user_preferences(	
  
	
  	
  	
  	
  GetResponseEvent	
  $event,	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  
	
  	
  	
  	
  DomainSecurityContext	
  $securityContext,	
  

	
  	
  	
  	
  User	
  $user)	
  
{	
  
	
  	
  	
  	
  $securityContext-­‐>getUser()-­‐>willReturn($user);	
  
!
	
  	
  	
  	
  $user-­‐>setPreferences(Argument::type(‘Preferences'))	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>shouldBeCalled();	
  
!
	
  	
  	
  	
  $this-­‐>handle($event);	
  
}	
  
Composition over Inheritance
separation of concerns
small, well focused objects
composition is simpler to test
public	
  function	
  __construct(SecurityContext	
  $securityContext){	
  
	
  	
  	
  	
  $this-­‐>securityContext	
  =	
  $securityContext;	
  
}	
  
!
public	
  function	
  getUser()	
  
{	
  
	
  	
  	
  	
  $token	
  =	
  $this-­‐>securityContext-­‐>getToken();	
  
	
  	
  	
  	
  if	
  ($token	
  instanceof	
  TokenInterface)	
  {	
  
	
  	
  	
  	
  	
  	
  	
  	
  return	
  $token-­‐>getUser();	
  
	
  	
  	
  	
  }	
  
!
	
  	
  	
  	
  return	
  null;	
  
}
We can still
improve
function	
  it_loads_user_preferences(	
  
	
  	
  	
  	
  GetResponseEvent	
  $event,	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  
	
  	
  	
  	
  DomainSecurityContext	
  $securityContext,	
  

	
  	
  	
  	
  User	
  $user)	
  
{	
  
	
  	
  	
  	
  $securityContext-­‐>getUser()-­‐>willReturn($user);	
  
!
	
  	
  	
  	
  $user-­‐>setPreferences(Argument::type(‘Preferences'))	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>shouldBeCalled();	
  
!
	
  	
  	
  	
  $this-­‐>handle($event);	
  
}	
  
function	
  it_loads_user_preferences(	
  
	
  	
  	
  	
  GetResponseEvent	
  $event,	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  	
  
	
  	
  	
  	
  DomainSecurityContextInterface	
  $securityContext,	
  

	
  	
  	
  	
  User	
  $user)	
  
{	
  
	
  	
  	
  	
  $securityContext-­‐>getUser()-­‐>willReturn($user);	
  
!
	
  	
  	
  	
  $user-­‐>setPreferences(Argument::type(‘Preferences'))	
  
	
  	
  	
  	
  	
  	
  	
  	
  	
  -­‐>shouldBeCalled();	
  
!
	
  	
  	
  	
  $this-­‐>handle($event);	
  
}	
  
Dependency
Inversion Principle
high-level modules should
not depend on low-level
modules; both should depend
on abstractions
DIP states:
DIP states:
abstractions should not
depend upon details; details
should depend upon
abstractions
Isn’t it overhead?
What are benefits of
using PHPSpec?
TDD-cycle
oriented tool
ease Mocking
focused on
Messaging
encourages
injecting right
Collaborators
and following
Law of Demeter
enables
Refactoring
and gives you
Regression Safety
and it’s trendy ;)
Is PHPSpec
the only design tool
we need?
s
So it helps ;)
Kacper Gunia
Software Engineer
Symfony Certified Developer
PHPers Silesia
Thanks!
joind.in/10864

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