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![“Key in making great and growable systems is to
design how its modules communicate
[andnot]whattheirpropertiesandbehavioursshouldbe.”
Messaging
ViewpointsResearchInstituteSource-BonnieMacbirdURL-http://www.vpri.org](https://image.slidesharecdn.com/emergentdesignwithphpspec-130608073410-phpapp01/75/Emergent-design-with-phpspec-40-2048.jpg)
![61%
oftherequestedfeaturesareactuallydelivered
[Standish Group Report 06]](https://image.slidesharecdn.com/emergentdesignwithphpspec-130608073410-phpapp01/75/Emergent-design-with-phpspec-53-2048.jpg)
Uploaded byMarcello Duarte
Emergent design with phpspec
This document discusses emergent design and test-driven development using PHP and PHPSpec. It emphasizes designing software through describing how objects interact to solve problems, focusing on messaging between objects. Simple design rules like removing duplication and complexity are recommended to make code more testable, modular, and change-friendly. Designing for delegation using mocks is presented as a way to extract collaborators and move behavior definitions.
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Emergent design with phpspec
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- 14. 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
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- 16. 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);
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- 24. { "require-dev": { "phpspec/phpspec": "2.0.*@dev" }, "config":{ "bin-dir": "bin" }, "autoload": { "psr-0": { "": "src" } } }
- 25. $ bin/phpspec describeSome/Class$ bin/phpspec describe Some/Class
- 26. $ bin/phpspec describeSome/Class $ bin/phpspec run $ bin/phpspec describe Some/Class $ bin/phpspec run
- 27. $ bin/phpspec describeSome/Class $ bin/phpspec run phpspec generators $ bin/phpspec describe Some/Class $ bin/phpspec run phpspec generators
- 28. $ bin/phpspec describeSome/Class $ bin/phpspec run $ editor_of_choice . phpspec generators $ bin/phpspec describe Some/Class $ bin/phpspec run $ editor_of_choice . phpspec generators
- 29. $ bin/phpspec describeSome/Class $ bin/phpspec run $ editor_of_choice . phpspec generators $ bin/phpspec describe Some/Class $ bin/phpspec run $ editor_of_choice . phpspec generators
- 30. $ bin/phpspec describeSome/Class $ bin/phpspec run $ editor_of_choice . phpspec generators $ bin/phpspec describe Some/Class $ bin/phpspec run $ editor_of_choice . phpspec generators
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- 40. “Key in makinggreat and growable systems is to design how its modules communicate [andnot]whattheirpropertiesandbehavioursshouldbe.” Messaging ViewpointsResearchInstituteSource-BonnieMacbirdURL-http://www.vpri.org
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- 51. relativecostofrepaircost time analysis design codetest deploy rework $
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- 65. TestSmells • Lackoftests • Testsarenotunitary •Setupistoocomplex • Unclearexercise • Morethanoneexpectationina test • Noexpectation • Toomanypaths
- 66. DrySmells • Simpleduplication • Logicduplication •Duplicationofconstant • Alternativeclasseswithdifferentinterfaces
- 67. OpacitySmells • Namenotfromdomain • Namenotexpressingintent •Featureenvy • Methoddoesmorethanone thing • Methodtoolong • Primitiveobsession • Commentsinthecode • MiddleMan
- 68. ComplexitySmells • Unnecessaryelse • Unnecessaryif •Unnecessaryswitch • Toomanyargumentspassed • InappropriateIntimacy • Workinconstruction • Staticcontext
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- 79. Finally • Definenewrole • Extractcollaboratorsusingmocks •Movebehaviourdefinitiontonewcollaboratortest
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