Using of TDD practices for Magento

Using of Test Driven DevelopmentPractices for Magento
Ivan Chepurnyi
Magento Trainer / Lead Developer

Short Overview
Meet Magento Netherlands
Write a test
Imaging how your feature should work and write a failing test
Write feature quickly for receiving passed test
Refactor your code and run the test again
Pass
Run the tests
Fail
Pass
Write the code
Fail
Run the tests

Conventional Development
You need to write a full functionality for seeing the result
You think that your code works
Debugging
With every fixed issue you may produce a new one
Even if you write unit tests after implementation it doesn’t guarantee that you detect the defect.

Test Driven Development
You don’t need to implement full functionality for seeing the result
Your colleagues can use your test as learning material
The test proofs that your code works and can be verified
Serious defects can be fixed on early state

Defect Costs
Percentage from project development hours
< 1%
20%
> 40%
Defect found at the coding stage
Defect found during QA phase
Defect found after going live

Type of Tests
Automated Test
Regression Test
Learning Test
Integration Test

Test in Isolation
Make test simple
Test erroneous situations
Test Doubles (Fake heavy resources you don’t depend on)
Main Principles

EcomDev_PHPUnit
Making possible isolation of your test
Easy test data loading via Yaml fixtures
Data providers and expectations for reusable tests
Easy way of testing configuration files
Easy way for Layouts & Controllers integration test

Simple Test Case
class 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

Simple Test Case
eav:
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

Simple Test Case
1-2: # Product=Book Store=USA
final_price: 9.99
price: 12.99
1-3: # Product=Book Store=Canada
final_price: 12.99
price: 12.99
Yaml Expectation
Yaml Data Provider
-
- 1
- usa
-
- 1
- canada
-
- 1
- germany

Event Dispatch Check
class 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

Test Doubles
class 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

Config Test Case
class 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

Config Test Case
{
//….
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

Config Test Case
{
//….
public function testEventObservers()
{
$this->assertEventObserverDefined(
'frontend', 'customer_login',
'catalog/product_compare_item',
'bindCustomerLogin'
);
}
}
Testing Event Observer Definitions

Controller Test Case
class 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

Controller Test Case
class 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

What’s Next
Write automated tests for your moduleshttp://www.magentocommerce.com/magento-connect/Ecommerce%20Developers/extension/5717/ecomdev_phpunit
Keep project healthy during its lifecycle with Continuous Integration
Running Daily Builds
Running Unit Tests in 10 minutes after last commit
Hudson http://hudson-ci.org
phpUnderControlhttp://phpundercontrol.org/

Questions?
ivan.chepurnyi@ecomdev.org

Using of TDD practices for Magento

by Ivan Chepurnyi on May 19, 2011

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Using of TDD practices for Magento — Presentation Transcript