Unit Test Fun

Max Köhler I 02. Dezember 2010

Unit Test Fun: Mock Objects, Fixtures, Stubs & Dependency Injection

Unit Test Fun: Mock Objects, Fixtures, Stubs & Dependency Injection I Mayflower GmbH I 02. Dezember 2010 I

Wer macht UnitTests?

2007 2008 2009 2010Ohne Titel 1Ohne Titel 2Ohne Titel 3Ohne Titel 4Unit Test Fun: Mock Objects, Fixtures, Stubs & Dependency Injection I Mayflower GmbH I 02. Dezember 2010 I

Code Coverage?

Wer glaubt, dass die Tests gut sind?

Kann die Qualität gesteigert werden?

Test der kompletten Architektur?

Controller

Wie testet Ihr eure Models?

Direkter DB-Zugriff?

Keine UnitTests!

Integration Tests!

Wie testet Ihr eure Controller?

Routes, Auth-Mock, Session-Mock, ...?

Unit Test Fun: Mock Objects, Fixtures, Stubs & Dependency Injection I Mayflower GmbH I 02. Dezember 2010 I 14

Keine UnitTests!

Was wollen wir testen?

Unit Testing

Integration

Testing

System - Integration

Testing

Acceptance

Testing

Regression

Testing

System Testing

Unit Testing

The goal of unit testing is to isolate each part of the program and show that the individual parts are

correct

Test Doubles

Fake that returns canned data...

Beispiel für ein Auth-Stub

$storageData = array( 'accountId' => 29, 'username' => 'Hugo', 'jid' => 'hugo@example.org');

$storage = $this->getMock('Zend_Auth_Storage_Session', array('read')); $storage->expects($this->any()) ->method('read') ->will($this->returnValue($storageData));

Zend_Auth::getInstance()->setStorage($storage);

// ...

/* * Bei jedem Aufruf wird nun das Mock als Storage * verwendet und dessen Daten ausgelesen */ $session = Zend_Auth::getInstance()->getIdentity();

Spy with expectations...

Model Mapper Beispiel

class Application_Model_GuestbookMapper{ protected $_dbTable;

public function setDbTable(Zend_Db_Table_Abstract $dbTable) { $this->_dbTable = $dbTable; return $this; }

public function getDbTable() { return $this->_dbTable; }

public function getEmail() {} public function getComment() {}

public function save(Application_Model_Guestbook $guestbook) { $data = array( 'email' => $guestbook->getEmail(), 'comment' => $guestbook->getComment(), );

$this->getDbTable()->insert($data); }}

Testen der save() Funktion

class Applicatoin_Model_GuestbookMapperTest extends PHPUnit_Framework_TestCase{ public function testSave() { $modelStub = $this->getMock('Application_Model_Guestbook', array('getEmail', ,getComment'));

$modelStub->expects($this->once()) ->method('getEmail') ->will($this->returnValue('super@email.de'));

$modelStub->expects($this->once()) ->method('getComment') ->will($this->returnValue('super comment'));

$tableMock = $this->getMock('Zend_Db_Table_Abstract', array('insert'), array(), '', false); $tableMock->expects($this->once()) ->method('insert') ->with($this->equalTo(array(

'email' => 'super@email.de', 'comment' => 'super comment')));

$model = new Application_Model_GuestbookMapper(); $model->setDbTable($tableMock); // << MOCK $model->save($modelStub); // << STUB }}

Spy with expectations...

MockFake that

returns canned data...

Fixtures

Set the world up in a known

state ...

Fixture-Beispiel

class Fixture extends PHPUnit_Framework_TestCase{ protected $fixture;

protected function setUp() { $this->fixture = array(); }

public function testEmpty() { $this->assertTrue(empty($this->fixture)); }

public function testPush() { array_push($this->fixture, 'foo'); $this->assertEquals('foo', $this->fixture[0]); }

public function testPop() { array_push($this->fixture, 'foo'); $this->assertEquals('foo', array_pop($this->fixture)); $this->assertTrue(empty($this->fixture)); }}

Method Stack

public static function setUpBeforeClass() { }

protected function setUp() { }

public function testMyTest() { /* TEST */ }

protected function tearDown() { }

protected function onNotSuccessfulTest(Exception $e) { }

public static function tearDownAfterClass() { }

Ablauf

Test Suite ...

...wirkt sich auf die Architektur aus.

Wenn nicht...

Titel der Präsentation I Mayflower GmbH I xx. Juni 2010 I 34

Developer

Was kann man machen?

Production Code überarbeiten

Dependency Injection

Bemerkt?

Dependency Injection

Besser aber ...

... Begeisterung sieht anders aus!

Was könnte noch helfen?

[~~~~~~~~~~]

Test Driven Development

Probleme früh erkennen!

Uncle Bob´s

Three Rules of TDD

“ You are not allowed to write any

production code unless it is to make a failing unit test pass.

“ You are not allowed to write any more of

a unit test than is sufficient to fail; and compilation failures are failures.

“ You are not allowed to write any more

production code than is sufficient to pass the one failing unit test.

Und wieder...

Developer

Und jetzt?

Things get worst before they get

better !

Monate später...

Gibts noch was?

Darf ich vorstellen:„Bug“

Regression Testing

orTest your Bugs!

Regression Testing

class Calculate{ public function divide($dividend, $divisor) { return $dividend / $divisor; }}

2 Warning: Division by zero in /srv/phpunit-slides/Calculate.php on line 7

Regression Testing

Test First!

/** * Regression-Test BUG-123 * * @group BUG-123 * * @return void */ public function testDivideByZero() { $calc = new Calculate(); $this->assertEquals(0, $calc->divide(1, 0)); }

Regression Testing

Bugfix

4class Calculate{ public function divide($dividend, $divisor) { if (0 == $divisor) { return 0; } return $dividend / $divisor; }}

Regression Testing

phpunit

5slides$ phpunit --colors --verbose CalculateTest.php PHPUnit 3.5.5 by Sebastian Bergmann.

CalculateTest......

Time: 0 seconds, Memory: 5.25Mb

OK (6 tests, 6 assertions)

Regression Testing

@group

?slides$ phpunit --colors --verbose --group BUG-123 CalculateTest.php PHPUnit 3.5.5 by Sebastian Bergmann.

CalculateTest.

Time: 0 seconds, Memory: 5.25Mb

OK (1 tests, 1 assertions)

/** * Regression-Test BUG-123 * * @group BUG-123 * * @return void */ public function testDivideByZero() {

Noch Fragen?

Quellen

I Baby: ADDROX http://www.flickr.com/photos/addrox/2587484034/sizes/m/

I Fish: ADDROX http://www.flickr.com/photos/addrox/274632284/sizes/m/

I Happy: ADDROX http://www.flickr.com/photos/addrox/2610064689/sizes/m/

I Bug: ADDROX http://www.flickr.com/photos/addrox/284649644/sizes/m/

Vielen Dank für Ihre Aufmerksamkeit!

Kontakt Max Köhlermax.koehler@mayflower.de+49 89 242054-1160

Mayflower GmbHMannhardtstr. 680538 München

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