Test Driven Development (TDD) involves writing tests before writing code to ensure features work as intended. The document discusses: 1. The TDD process of writing a failing test, writing code to pass the test, and refactoring code and rerunning tests. 2. Benefits of TDD like detecting defects early, code that works as intended, and tests as documentation. 3. EcomDev_PHPUnit, a library that makes it easy to write isolated, data-driven, and integration tests for Magento modules. 4. Examples of different types of tests like models, controllers, layouts, configurations, and more.

1. Using of Test Driven DevelopmentPractices for MagentoIvan ChepurnyiMagento Trainer / Lead Developer

2. Short OverviewMeet Magento NetherlandsWrite a testImaging how your feature should work and write a failing testWrite feature quickly for receiving passed testRefactor your code and run the test againPassRun the testsFailPassWrite the codeFailRun the tests

3. Conventional DevelopmentMeet Magento NetherlandsYou need to write a full functionality for seeing the resultYou think that your code worksDebuggingWith every fixed issue you may produce a new oneEven if you write unit tests after implementation it doesn’t guarantee that you detect the defect.

4. Test Driven DevelopmentMeet Magento NetherlandsYou don’t need to implement full functionality for seeing the resultYour colleagues can use your test as learning materialThe test proofs that your code works and can be verifiedSerious defects can be fixed on early state

5. Defect CostsMeet Magento NetherlandsPercentage from project development hours< 1%20%> 40%Defect found at the coding stageDefect found during QA phaseDefect found after going live

6. Type of TestsMeet Magento NetherlandsAutomated TestRegression TestLearning TestIntegration Test

7. Meet Magento NetherlandsTest in IsolationMake test simpleTest erroneous situationsTest Doubles (Fake heavy resources you don’t depend on)Main Principles

8. EcomDev_PHPUnitMeet Magento NetherlandsMaking possible isolation of your testEasy test data loading via Yaml fixturesData providers and expectations for reusable testsEasy way of testing configuration filesEasy way for Layouts & Controllers integration test

9. Simple Test CaseMeet Magento Netherlandsclass EcomDev_Example_Test_Model_Productextends EcomDev_PHPUnit_Test_Case{ /** * @test * @loadFixture * @dataProviderdataProvider */ public function priceCalculation($productId, $storeId) { $storeId = Mage::app()->getStore($storeId)->getId(); $product = Mage::getModel('catalog/product') ->setStoreId($storeId) ->load($productId); $expected = $this->expected('%s-%s', $productId, $storeId); $this->assertEquals($expected->getFinalPrice(), $product->getFinalPrice()); $this->assertEquals($expected->getPrice(), $product->getPrice()); }}Test Case Class

10. Simple Test CaseMeet Magento Netherlandseav: catalog_product: - entity_id: 1 type_id: simple sku: book website_ids: - usa_website - canada_website price: 12.99 status: 1 # Enabled visibility: 4 # Visible in Catalog & Search /websites: # Set different prices per website usa_website: special_price: 9.99 german_website: price: 9.99 special_price: 5.99 Yaml Fixture

11. Simple Test CaseMeet Magento Netherlands1-2: # Product=Book Store=USAfinal_price: 9.99 price: 12.991-3: # Product=Book Store=Canadafinal_price: 12.99 price: 12.99Yaml ExpectationYaml Data Provider- - 1 - usa- - 1 - canada- - 1 - germany

12. Event Dispatch CheckMeet Magento Netherlandsclass EcomDev_Example_Test_Model_Cms_Pageextends EcomDev_PHPUnit_Test_Case{ // … public function testAvailableStatuses() { Mage::getModel(‘cms/page’)->getAvailableStatuses(); $this->assertEventDispatched( ‘cms_page_get_available_statuses’ ); }}Test Case

13. Test DoublesMeet Magento Netherlandsclass EcomDev_PHPUnit_Tes_Case_Controllerextends EcomDev_PHPUnit_Test_Case{ protected function registerCookieStub() { $cookie = $this->getModelMock('core/cookie', array('set', 'delete')); $cookie->expects($this->any()) ->method('set') ->will($this->returnCallback(array($this, 'setCookieCallback‘))); $cookie->expects($this->any()) ->method('delete‘) ->will($this->returnCallback(array($this, 'deleteCookieCallback‘))); $this->replaceByMock('singleton', 'core/cookie', $cookie); return $this; }}Test Case

14. Config Test CaseMeet Magento Netherlandsclass EcomDev_Example_Test_Config_Main extends EcomDev_PHPUnit_Test_Case_Config{ //…. public function testModuleVersion() { $this->assertModuleCodePool('local'); $this->assertModuleDepends(‘Mage_Catalog’); $this->assertModuleVersionGreaterThan(‘0.1.0'); }}Testing Module Nodes

15. Config Test CaseMeet Magento Netherlandsclass EcomDev_Example_Test_Config_Main extends EcomDev_PHPUnit_Test_Case_Config{ //…. public function testClassAliasDefinitions() { $this->assertModelAlias('catalog/product', 'Mage_Catalog_Model_Product'); $this->assertResourceModelAlias( 'catalog/product', ‘Mage_Catalog_Model_Resource_Eav_Mysql4_Product‘ ); $this->assertBlockAlias( 'catalog/product_list', 'Mage_Catalog_Block_Product_List‘ ); }}Testing Class Aliases

16. Config Test CaseMeet Magento Netherlandsclass EcomDev_Example_Test_Config_Main extends EcomDev_PHPUnit_Test_Case_Config{ //…. public function testEventObservers() { $this->assertEventObserverDefined( 'frontend', 'customer_login', 'catalog/product_compare_item', 'bindCustomerLogin' ); }}Testing Event Observer Definitions

17. Controller Test CaseMeet Magento Netherlandsclass EcomDev_Example_Test_Controller_Main extends EcomDev_PHPUnit_Test_Case_Controller{ public function testRequest() { $this->dispatch('cms'); $this->assertRequestDispatched(); $this->assertRequestNotForwarded(); $this->assertRequestRoute('cms/index/index'); $this->assertRequestRouteName('cms'); $this->assertRequestControllerName('index'); $this->assertRequestControllerModule('Mage_Cms'); $this->assertRequestActionName('index'); }}Testing Request

18. Controller Test CaseMeet Magento Netherlandsclass EcomDev_Example_Test_Controller_Main extends EcomDev_PHPUnit_Test_Case_Controller{ public function testLayout() { $this->dispatch(''); $this->assertLayoutHandleLoaded('cms_index_index'); $this->assertLayoutBlockCreated('right'); $this->assertLayoutBlockRendered('content'); $this->assertLayoutBlockActionNotInvoked( 'footer_links', 'addLink', '', array('Custom Title') ); $this->assertLayoutBlockActionInvokedAtLeast( 'footer_links', 'addLink', 4, '‘ ); }}Testing Layouts

19. What’s NextMeet Magento NetherlandsWrite automated tests for your moduleshttp://www.magentocommerce.com/magento-connect/Ecommerce%20Developers/extension/5717/ecomdev_phpunitKeep project healthy during its lifecycle with Continuous IntegrationRunning Daily BuildsRunning Unit Tests in 10 minutes after last commitHudson http://hudson-ci.orgphpUnderControlhttp://phpundercontrol.org/

20. Questions?ivan.chepurnyi@ecomdev.org