behavioural driven development in zf2
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Behavior-Driven Development with Zend Framework 2
Zend Framework Day – Turin, Italy – 07/02/2014
DAVID CONTAVALLI
@mauipipe
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CLEAN CODE ADEPT BDD FANATIC
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CLEAN CODE ADEPT BDD FANATIC
WHAT IS BDD?
TDD Evolution
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1. You are not allowed to write any production code
unless it is to make a failing unit test pass.
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SAME RULES
1. You are not allowed to write any production code
unless it is to make a failing unit test pass.
2. You are not allowed to write any more of a unit test than is sufficient to fail; and compilation failures are failures.
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SAME RULES
1. You are not allowed to write any production code
unless it is to make a failing unit test pass.
2. You are not allowed to write any more of a unit test than is sufficient to fail; and compilation failures are failures.
3. You are not allowed to write any more production code than is sufficient to pass the one failing unit test.
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SAME RULES
WHAT’S THE DIFFERENCE?
TDD STARTS FROM COMPONENTS
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CREATE THE TEST
private $calculator; function setUp(){ $this->calculator = new Calculator(); } function testSumTwoPositive(){ $expectedResult = 8; $result = $this->calculator(6,2); assertEquals($expectedResult,$result); }
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WRITE QUICK, TEST VALIDATING CODE
class Calculator{ public function sum($num1, $num2){ return 8; } }
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REFACTOR
class Calculator{ public function sum($num1, $num2){ $sum = $num1 + $num2; return $sum; } }
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BDD STARTS FROM AN EXAMPLE
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SPECIFICATION BY EXAMPLE
Scenario: Add two number Given I fill number1 field with 2 And I fill number2 field with 6 When I press Add button Then the result should be 8
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A COMMON LANGUAGE
STAKEHOLDER
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DEVELOPER
STAKEHOLDER
A COMMON LANGUAGE
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DEVELOPER
STAKEHOLDER USER
A COMMON LANGUAGE
LIVING DOCUMENTATION
HOW IS STORY CODE RELATED?
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GHERKIN
Scenario: Add two number Given I fill number1 field with 2 And I fill number2 field with 6 When I press Add button Then the result should be 8
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Interpreted in many languages
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GHERKIN
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GHERKIN
WHAT IS BEHAT?
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Scenario: Add two numbers Given I fill number1 field with value of 2
TRANSLATE
/** * @Given /^I fill ([^’’]*) with (\d+)$/ **/ public function iFieldFieldWith($number, $fieldName) { throw new PendingException(); }
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EXECUTION
USERS WILL NOT READ STORIES
THEY WILL USE AN UI
BROWSER
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HOW TO TEST BROWSER WITH BEHAT?
HERE IT COMES, MINK!
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GHERKIN
+
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GOUTTE • Headless Browser • No Javascript • Really fast
Web Acceptance Test
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GOUTTE • Headless Browser • No Javascript • Really fast
SELENIUM • Can test Javascript • Really slow • Use Firefox as emulator
Web Acceptance Test
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GOUTTE • Headless Browser • No Javascript • Really fast
SELENIUM • Can test Javascript • Really slow • Use Firefox as emulator
Zombie.js • Can test Javascript • Medium • Use Firefox as emulator
Web Acceptance Test
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GOUTTE • Headless Browser • No Javascript • Really fast
SELENIUM • Can test Javascript • Really slow • Use Firefox as emulator
Zombie.js • Can test Javascript • Medium • Use Firefox as emulator
SAHI • Can test Javascript • slow • Emulate every Browser
Web Acceptance Test
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/** * @When /^I press ‘’(/[^’’]*)’’ button$/ **/ public function iPressButton($buttonName) { $this->pressButton($buttonName); }
Scenario: Add two numbers Given I fill number1 field with 2 And I fill number2 field with 6 When I press Add button Then the result should be 8
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How to install....
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"require-dev " :{ ......... "behat/behat" : "2.4.*@stable", "behat/mink": "1.5.0", "behat/mink-extension":"*", "behat/mink-browserkit-driver":"dev-master", "behat/mink-goutte-driver":"*", "phpspec/phpspec":" 2.0.*@dev" }
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Differs from documentation
because there is a fix for ZF2
multicheckbox selection
"require-dev " :{ ......... "behat/behat" : "2.4.*@stable", "behat/mink": "1.5.0", "behat/mink-extension":"*", "behat/mink-browserkit-driver":"dev-master", "behat/mink-goutte-driver":"*", "phpspec/phpspec":" 2.0.*@dev" }
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default : extensions : Behat\MinkExtension\Extension : base_url : 'http://example.com' goutte : ~
behat.yml
Mink Setup
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private static app; /** * @BeforeSuite **/ public static function initializeZf(){ If(self::$zendApp === null){ $path = __DIR__ .’/../../config/application.config.php’; self::app = \Zend\Mvc\Application::init(require $path); } }
Static method
ZF2 EXTENSION
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"require-dev":{ ................ "mvlabs/zf2behat-extension":"dev-master" },
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default : extensions : MvLabs\Zf2Extension\Zf2Extension : config : config/application.config.php module :
behat.yml
Zf2 Behat Extension
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bin/behat --init ‘’module name’’ run from console
Zf2 Behat Extension
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class FeatureContext extends MinkContext implements Zf2AwareContextInterface{ private $zf2MvcApplication; ......... public function setZf2App(Application $zf2MvcApplication) { $this->zf2MvcApplication = $zf2MvcApplication; } }
Implements Zf2AwareContextInterface
Feature Context
WE STILL NEED TO TEST OUR COMPONENTS
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GHERKIN
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WHY PHPSPEC?
BDD BASED ON BEHAVIOUR DESCRIPTION
Robert C. Martin
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private $calculator; function setUp(){ $this->calculator = new Calculator(); } function testSumTwoPositive(){ $expectedResult = 8; $result = $this->calculator(6,2); assertEquals($expectedResult,$result); }
PHPUnit focus on testing code
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function let(){ $this->shouldBeConstructed(); } function it_sum_two_positive_number(){ $this->sum(2,6)->shouldReturn(8); }
PHPSpec focus on code behavior
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"It’s this unexisting object, on which you’re calling unexisting methods and assuming future outcomes. Most important thing? There could be only one SUS in specification" Kostantin Kudryashov
Subject under Specification
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Developer Tool Vs Testing Framework
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bin/phpspec desc ‘’Application\Controller\IndexController’’
Autogenerates classes & methods
PROMOTES CLEAN CODE
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function let(){ $this->shouldBeConstructed(); } function it_sum_two_positive_number(){ $this->getPlayer()->getSword()->shouldBeInstanceOf(‘Sword’); }
Demeter Law's Violation
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function let(){ $this->shouldBeConstructed(); } function it_sum_two_positive_number(){ $this->getPlayer()->getSword()->shouldBeInstanceOf(‘Sword’); }
Impossible
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Add PHPSpec to Zf2
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"require-dev":{ ........... "phpspec/phpspec" : "2.0.*@dev" }, "config": { "bin-dir": "bin/" }, "autoload": { "psr-0" { "Application" : " module/Application/src" } }
’’require-dev’’:{ ... "phpspec/phpspec":" 2.0.*@dev" }, "config": { "bin-dir": "bin« }, "autoload": { "psr-0": { "Application": "module/Application/src" } }
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"require-dev":{ ........... "phpspec/phpspec" : "2.0.*@dev" }, "config": { "bin-dir": "bin/" }, "autoload": { "psr-0" { "Application" : " module/Application/src" } }
Add a single module
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"require-dev":{ ........... "phpspec/phpspec" : "2.0.*@dev" }, "config": { "bin-dir": "bin/" }, "autoload": { "psr-0" { "Application" : " module/Application/src", "Calculator" : "module/Calculator/src" } }
Add more modules
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formatter.name : progresssuites Application: namespace : Application spec_prefix : Spec src_path : 'module/Application/src/' spec_path : 'module/Application/' ModuleDemo: namespace : ModuleDemo spec_prefix : Spec src_path : 'module/ModuleDemo/src/' spec_path : 'module/ModuleDemo/'
Create phpspec.yml in project root
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What to test with PHPSpec?
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1.Model Logic
What to test with PHPSpec?
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1.Model Logic
2.Factories
What to test with PHPSpec?
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1.Model Logic
2.Factories
3.Validation
What to test with PHPSpec?
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1.Verbose Stories
2.Using Mink to test REST calls
3.Testing every possible usages combination
4.Fixture loading within Context
Behat bad practices
WHY TESTING?
IT’S A TREND
RELAX
SOMEONE WILL READ YOUR CODE
IT COULD BE YOU SOME DAY
YOUR COLLEAGUES
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OR
A VIOLENT PSYCHOPATH WHO KNOWS WHERE YOU LIVE
Thank you for your attention
David Contavalli @mauipipe
QUESTIONS?
@mauipipe mauipipe@gmail.com
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Some readings
Credits
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https://www.flickr.com/photos/42788859@N00/318947873
https://www.flickr.com/photos/79811974@N08/8895959339/
https://www.flickr.com/photos/wingedwolf/5471047557/
https://www.flickr.com/photos/21112928@N07/2922128673/
https://www.flickr.com/photos/23408922@N07/8220573257/
https://www.flickr.com/photos/11956371@N07/4146284063/
http://www.flickr.com/photos/chemicalbrother/2540855983/
http://www.flickr.com/photos/slworking/5757370044/
http://www.flickr.com/photos/ter-burg/5807937726/
http://www.flickr.com/photos/thyagohills/5023536434/
http://www.flickr.com/photos/jeremybrooks/2175042537/
http://www.flickr.com/photos/bowmanlibrary/941844481/
http://www.flickr.com/photos/webhamster/2476756607/
http://www.flickr.com/photos/nebirdsplus/5835963068/
http://www.flickr.com/photos/mistaboos/4348381987/
http://www.flickr.com/photos/moofbong/4207382992/
http://www.flickr.com/photos/ryanh/43936630/
http://www.flickr.com/photos/nathangibbs/98592171/
http://www.flickr.com/photos/71894657@N00/2553948289/
http://www.flickr.com/photos/ahia/3168219760/
http://www.flickr.com/photos/smileham/3559228586/
http://www.flickr.com/photos/kk/3834592792/
http://www.flickr.com/photos/enoughproject/5776533975/
http://www.flickr.com/photos/_flood_/8067625282/
http://www.flickr.com/photos/drooo/3114233333/
http://www.flickr.com/photos/84143785@N00/3559757811
David Contavalli @mauipipe
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