Unit Test Fun

© 2010 Mayflower GmbH

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?

2

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?

3


Wer glaubt, dass die Tests gut sind?

4


Kann die Qualität gesteigert werden?

5

0%

100%


Test der kompletten Architektur?

6


MVC?

7

View

Controller

Model


Wie testet Ihr eure Models?

8


Direkter DB-Zugriff?

9

STOP


Keine UnitTests!

10


Integration Tests!

11


Wie testet Ihr eure Controller?

12


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

13

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

STOP

Keine UnitTests!


Was wollen wir testen?

15


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

18


Stubs

19


Fake that returns canned data...


Beispiel für ein Auth-Stub

21

$storageData = array( 'accountId' => 29, 'username' => 'Hugo', 'jid' => '[email protected]');

$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();

mailto:[email protected]



Mocks

22


Spy with expectations...


Model Mapper Beispiel

24

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

25

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('[email protected]'));

$modelStub->expects($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' => '[email protected]', 'comment' => 'super comment')));

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






Spy with expectations...

MockFake that

returns canned data...

Stub

!==


Fixtures

27


Set the world up in a known

state ...


Fixture-Beispiel

29

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

30

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 ...

31


...wirkt sich auf die Architektur aus.

32


Wenn nicht...

33

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

Developer


Was kann man machen?

35


Production Code überarbeiten

36


Dependency Injection

37


Bemerkt?

38


Dependency Injection

39














Besser aber ...

40


... Begeisterung sieht anders aus!


Was könnte noch helfen?

42

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

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

Test Driven Development


TDD?

43


Probleme früh erkennen!

44


Uncle Bob´s

45

Three Rules of TDD


“ You are not allowed to write any

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

46

#1


“ You are not allowed to write any more of

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

#2


“ You are not allowed to write any more

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

#3


Und wieder...

49


Developer


Und jetzt?

51


Things get worst before they get

better !


Monate später...


Gibts noch was?

54


Darf ich vorstellen:„Bug“


Regression Testing

56

orTest your Bugs!


Regression Testing

57

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

1

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

Bug


Regression Testing

58

Test First!

3

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


Regression Testing

59

Bugfix

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


Regression Testing

60

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

61

@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?

62


Quellen

63

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/

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








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Unit Test Fun