Emergent design with phpspec
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Marcello DuarteFollow
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Emergent design with phpspec
Jun. 8, 2013•0 likes•8,787 views
26 likes
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Where does design fit in agile projects? What is refactoring and what isn't refactoring? What is the relationship between design and refactoring, and design and architecture? In this talk we will clarify these and other questions around emergent design and how a TDD/BDD tool like phpspec can help you with the process. We will look into how phpspec helps uncover smelly code and point in the direction of refactoring techniques to guide the design of flexible, testable and easy to extend object oriented PHP code – enabling developers to focus on what’s more valuable for the customer at all times and re-steer the direction of the product.
Marcello DuarteFollow
Emergent design with phpspec
- by@_md emergentdesignwith
- Iworkhere Icontributehere Itweethere @_md MarcelloDuarte
- it’s2007
- @padraicb @tswicegood
- aportforrspec
- !== http://earthymoon.deviantart.com/art/Elephant-png-122633500 http://sonylisation.deviantart.com/art/Ruby-Nr-2-207831683
- bowling.score.should eq(0)
- inrubyeverythingisanobject andallobjectsareopen bowling.score.should eq(0)
- inrubyeverythingisanobject andallobjectsareopen http://www.flickr.com/photos/owenbooth/126288240/ bowling.score.should eq(0)
- inrubyeverythingisanobject andallobjectsareopen http://www.flickr.com/photos/owenbooth/126288240/ bowling.score.should eq(0)
- $this->spec($bowling->getScore()) ->shouldEqual(0); PHPSPECEARLYSYNTAXEXAMPLE
- http://www.flickr.com/photos/jamesrbowe/8403688026/ amber... red... green...
- md@bossa:tests $ phpunit . PHPUnit 3.7.14 by Sebastian Bergmann. PHP Fatal error: Class 'Customer' not found in /Users/mduarte/Documents/NoSync/Lab/phpunit/ tests/CustomerTest.php on line 8 Fatal error: Class 'Customer' not found in / Users/mduarte/Documents/NoSync/Lab/phpunit/ tests/CustomerTest.php on line 8
- yougottabemockingme!
- public function testUpdateWithEqualTypes() { $installer = $this->createInstallerMock(); $manager = new InstallationManager('vendor'); $manager->addInstaller($installer); $initial = $this->createPackageMock(); $target = $this->createPackageMock(); $operation = new UpdateOperation($initial, $target, 'test'); $initial ->expects($this->once()) ->method('getType') ->will($this->returnValue('library')); $target ->expects($this->once()) ->method('getType') ->will($this->returnValue('library')); $installer ->expects($this->once()) ->method('supports') ->with('library') ->will($this->returnValue(true)); $installer ->expects($this->once()) ->method('update') ->with($this->repository, $initial, $target);
- @_md @everzet
- goals { funtoworkwith
- goals {developmenttool funtoworkwith
- goals {developmenttool let’snotgetintheway funtoworkwith
- goals {enforce(mockist)TDD developmenttool let’snotgetintheway funtoworkwith
- goals {enforce(mockist)TDD doitthePHPway developmenttool let’snotgetintheway funtoworkwith
- { "require-dev": { "phpspec/phpspec": "2.0.*@dev" }, "config": { "bin-dir": "bin" }, "autoload": { "psr-0": { "": "src" } } }
- $ bin/phpspec describe Some/Class$ bin/phpspec describe Some/Class
- $ bin/phpspec describe Some/Class $ bin/phpspec run $ bin/phpspec describe Some/Class $ bin/phpspec run
- $ bin/phpspec describe Some/Class $ bin/phpspec run phpspec generators $ bin/phpspec describe Some/Class $ bin/phpspec run phpspec generators
- $ bin/phpspec describe Some/Class $ bin/phpspec run $ editor_of_choice . phpspec generators $ bin/phpspec describe Some/Class $ bin/phpspec run $ editor_of_choice . phpspec generators
- $ bin/phpspec describe Some/Class $ bin/phpspec run $ editor_of_choice . phpspec generators $ bin/phpspec describe Some/Class $ bin/phpspec run $ editor_of_choice . phpspec generators
- $ bin/phpspec describe Some/Class $ bin/phpspec run $ editor_of_choice . phpspec generators $ bin/phpspec describe Some/Class $ bin/phpspec run $ editor_of_choice . phpspec generators
- littledemo
- emergentdesign
- designemergeiterativelydrivenbytests
- design is ...
- designsoftware is ...
- designsoftware is todescribehowwe’resolvingaproblem
- calculatecostvarianceforaperiod
- calculatecostvarianceforaperiod Period
- firstlearndesign,thenemergentdesign
- “Key in making great and growable systems is to design how its modules communicate [andnot]whattheirpropertiesandbehavioursshouldbe.” Messaging ViewpointsResearchInstituteSource-BonnieMacbirdURL-http://www.vpri.org
- messaging
- $this->person->getCar()->getEngine()->ignite();
- focusonmessaging makesthecodeflexible
- $this->person->startCar();
- describinghowobjectsinteracttosolveproblems whichroles,responsibilitiesandmessages designsoftware is
- bigdesignupfront
- IT’SHARDTOCHANGELATER.
- WENEEDTOTHINKABOUTTHINGSBEFOREDEVELOPING.
- WENEEDTOMAKESUREWEDON’TMISSANYTHING.
- THISISJUSTTHEWAYWEDOIT.
- relativecostofrepaircost time analysis design code test deploy rework $
- yagni
- 61% oftherequestedfeaturesareactuallydelivered [Standish Group Report 06]
- 27% ofrequestedfeaturesareactuallyused
- 5% to 10% areresponsibleforrealisingthebenefitsenvisioned
- designforthehighpriorityitems andmakeiteasytochangelater
- describinghowobjectsinteracttosolveproblems whichroles,responsibilitiesandmessages inachange-friendlyway designsoftwareinagile is
- easiersaidthandone?
- test coderefactor
- usesimpledesignrulestorefactor 1.Alltestsrunandpass 2.Removeduplication 3.Removeopacity 4.Removecomplexity
- resultsincode 1.Testable 2.Modular 3.Expressive 4.Simple
- lackoftestsbreaksinnerquality 1.Viscosity 2.Immobility,Rigidity,Fragility 3.Unreadable 4.Complex
- simpledesignisgreattodetectsmells
- simpledesign 1.Alltestsrunandpass 2.Removeduplication 3.Removeopacity 4.Removecomplexity smells 1. Anytestssmells? 2.AnyDRYsmells? 3.Anyopacitysmells? 4.Anycomplexitysmells?
- TestSmells • Lackoftests • Testsarenotunitary • Setupistoocomplex • Unclearexercise • Morethanoneexpectationina test • Noexpectation • Toomanypaths
- DrySmells • Simpleduplication • Logicduplication • Duplicationofconstant • Alternativeclasseswithdifferentinterfaces
- OpacitySmells • Namenotfromdomain • Namenotexpressingintent • Featureenvy • Methoddoesmorethanone thing • Methodtoolong • Primitiveobsession • Commentsinthecode • MiddleMan
- ComplexitySmells • Unnecessaryelse • Unnecessaryif • Unnecessaryswitch • Toomanyargumentspassed • InappropriateIntimacy • Workinconstruction • Staticcontext
- usedesignpatternstorefactor
- creational?behavioural?structural?
- whatcanhappeninamethod?
- returnavalue modifystate printsomething throwanexception delegate {methods
- returnavalue modifystate printsomething throwanexception delegate {methods notthefinal behaviour
- returnavalue printsomething throwanexception delegate{methods weshouldprobably delegatethattoo
- returnavalue throwanexception delegate{methods
- designdelegationwithmocks
- startbydefiningbehaviour
- internallydelegatetoanothermethod
- Finally • Definenewrole • Extractcollaboratorsusingmocks • Movebehaviourdefinitiontonewcollaboratortest
- phpspec emergentdesign simpledesignandsmells designingcompositionwithmocks
- MarcelloDuarte Iworkhere Icontributehere Itweethere @_md
- Thankyou!
- QuestionsorComments? wanttolearnmore?bitly.com/inviqa-bdd-training @_md joind.in/8459