Stub you!

Phake mocking object presentation to PUG Rome

Transcript

1. Stub you! Andrea Giuliano @bit_shark mercoledì 26 giugno 13
2. When you’re doing testing you’re focusing on one element at a time Unit testing mercoledì 26 giugno 13
3. to make a single unit work you often need other units The problem is mercoledì 26 giugno 13
4. provide canned answers to calls made during the test, usually not responding at all to anything outside what's programmed in for the test Stub objects mercoledì 26 giugno 13
5. objects pre-programmed with expectations which form a specification of the calls they are expected to receive Mock objects mercoledì 26 giugno 13
6. Mock objects Behaviour verification State verification Stub objects mercoledì 26 giugno 13
7. A simple stub example public interface MailService { public function send(Message $msg); } public class MailServiceStub implements MailService { private $sent = 0; public function send(Message $msg) { /*I’m just sent the message */ ++$sent; } public function numberSent() { return $this->sent; } } implementation mercoledì 26 giugno 13
8. A simple stub example state verification class OrderStateTester{... public function testOrderSendsMailIfFilled() { $order = new Order(TALISKER, 51); $mailer = new MailServiceStub(); $order->setMailer($mailer); $order->fill(/*somestuff*/); $this->assertEquals(1, $mailer->numberSent()); } } mercoledì 26 giugno 13
9. We’ve wrote a simple test. We’ve tested only one message has been sent BUT We’ve not tested it was sent to the right person with right content etc. mercoledì 26 giugno 13
10. ...using mock object class OrderInteractionTester... public function testOrderSendsMailIfFilled() { $order = new Order(TALISKER, 51); $warehouse = $this->mock(“Warehouse”); $mailer = $this->mock(“MailService”); $order->setMailer($mailer); $mailer->expects(once())->method("send"); $warehouse->expects(once())->method("hasInventory") ->withAnyArguments() ->will(returnValue(false)); $order->fill($warehouse->proxy()); } } mercoledì 26 giugno 13
11. PHAKE PHP MOCKING FRAMEWORK mercoledì 26 giugno 13
12. Zero-config Phake was designed with PHPUnit in mind mercoledì 26 giugno 13
13. stub a method $stub = $this->getMock('Namespace\MyClass'); $stub->expects($this->any()) ->method('doSomething') ->with('param') ->will($this->returnValue('returned')); with PHPUnit mercoledì 26 giugno 13
14. stub a method $stub = $this->getMock('Namespace\MyClass'); $stub->expects($this->any()) ->method('doSomething') ->with('param') ->will($this->returnValue('returned')); $stub = Phake::mock('Namespace\MyClass'); Phake::when($stub)->doSomething('param')->thenReturn('returned'); with PHPUnit with Phake mercoledì 26 giugno 13
15. an example class ShoppingCartTest extends PHPUnit_Framework_TestCase { ! private $shoppingCart; ! private $item1; ! private $item2; ! private $item3; ! public function setUp() ! { ! ! $this->item1 = Phake::mock('Item'); ! ! $this->item2 = Phake::mock('Item'); ! ! $this->item3 = Phake::mock('Item'); ! ! Phake::when($this->item1)->getPrice()->thenReturn(100); ! ! Phake::when($this->item2)->getPrice()->thenReturn(200); ! ! Phake::when($this->item3)->getPrice()->thenReturn(300); ! ! $this->shoppingCart = new ShoppingCart(); ! ! $this->shoppingCart->addItem($this->item1); ! ! $this->shoppingCart->addItem($this->item2); ! ! $this->shoppingCart->addItem($this->item3); ! } ! public function testGetSub() ! { ! ! $this->assertEquals(600, $this->shoppingCart->getSubTotal()); ! } } mercoledì 26 giugno 13
16. ShoppingCart implementation class ShoppingCart { ! /** ! * Returns the current sub total of the customer's order ! * @return money ! */ ! public function getSubTotal() ! { ! ! $total = 0; ! ! foreach ($this->items as $item) ! ! { ! ! ! $total += $item->getPrice(); ! ! } ! ! return $total; ! } } mercoledì 26 giugno 13
17. stubbing multiple calls $stub = $this->getMock('Namespace\MyClass'); $stub->expects($this->any()) ->method('doSomething') ->will($this->returnCallback(function($param) { $toReturn = array( 'param1' => 'returned1', 'param2' => 'returned2', })); with PHPUnit mercoledì 26 giugno 13
18. stubbing multiple calls $stub = $this->getMock('Namespace\MyClass'); $stub->expects($this->any()) ->method('doSomething') ->will($this->returnCallback(function($param) { $toReturn = array( 'param1' => 'returned1', 'param2' => 'returned2', })); $stub = Phake::mock('Namespace\MyClass'); Phake::when($stub)->doSomething('param1')->thenReturn('returned1') Phake::when($stub)->doSomething('param2')->thenReturn('returned2'); with PHPUnit with Phake mercoledì 26 giugno 13
19. an example class ItemGroupTest extends PHPUnit_Framework_TestCase { ! private $itemGroup; ! private $item1; ! private $item2; ! private $item3; ! public function setUp() ! { ! ! $this->item1 = Phake::mock('Item'); ! ! $this->item2 = Phake::mock('Item'); ! ! $this->item3 = Phake::mock('Item'); ! ! $this->itemGroup = new ItemGroup(array($this->item1, $this->item2, $this->item3)); ! } ! public function testAddItemsToCart() ! { ! ! $cart = Phake::mock('ShoppingCart'); ! ! Phake::when($cart)->addItem($this->item1)->thenReturn(10); ! ! Phake::when($cart)->addItem($this->item2)->thenReturn(20); ! ! Phake::when($cart)->addItem($this->item3)->thenReturn(30); ! ! $totalCost = $this->itemGroup->addItemsToCart($cart); ! ! $this->assertEquals(60, $totalCost); ! } } mercoledì 26 giugno 13
20. an example with consecutive calls class ItemGroupTest extends PHPUnit_Framework_TestCase { ! private $itemGroup; ! private $item1; ! private $item2; ! private $item3; ! public function setUp() ! { ! ! $this->item1 = Phake::mock('Item'); ! ! $this->item2 = Phake::mock('Item'); ! ! $this->item3 = Phake::mock('Item'); ! ! $this->itemGroup = new ItemGroup(array($this->item1, $this->item2, $this->item3)); ! } ! public function testAddItemsToCart() ! { ! ! $cart = Phake::mock('ShoppingCart'); ! ! Phake::when($cart)->addItem(Phake::anyParameters())->thenReturn(10) ! ! ! ->thenReturn(20) ! ! ! ->thenReturn(30); ! ! $totalCost = $this->itemGroup->addItemsToCart($cart); ! ! $this->assertEquals(30, $totalCost); ! } } mercoledì 26 giugno 13
21. partial mock class MyClass { ! private $value; ! public __construct($value) ! { ! ! $this->value = $value; ! } ! public function foo() ! { ! ! return $this->value; ! } } mercoledì 26 giugno 13
22. partial mock class MyClass { ! private $value; ! public __construct($value) ! { ! ! $this->value = $value; ! } ! public function foo() ! { ! ! return $this->value; ! } } class MyClassTest extends PHPUnit_Framework_TestCase { ! public function testCallingParent() ! { ! ! $mock = Phake::partialMock('MyClass', 42); ! ! $this->assertEquals(42, $mock->foo()); ! } } mercoledì 26 giugno 13
23. default stub class MyClassTest extends PHPUnit_Framework_TestCase { ! public function testDefaultStubs() ! { ! ! $mock = Phake::mock('MyClass', Phake::ifUnstubbed()->thenReturn(42)); ! ! $this->assertEquals(42, $mock->foo()); ! } } class MyClass { ! private $value; ! public __construct($value) ! { ! ! $this->value = $value; ! } ! public function foo() ! { ! ! return $this->value; ! } } mercoledì 26 giugno 13
24. stubbing magic methods class MagicClass { public function __call($method, $args) { return '__call'; } } mercoledì 26 giugno 13
25. stubbing magic methods class MagicClass { public function __call($method, $args) { return '__call'; } } class MagicClassTest extends PHPUnit_Framework_TestCase { public function testMagicCall() { $mock = Phake::mock('MagicClass'); Phake::when($mock)->myMethod()->thenReturn(42); $this->assertEquals(42, $mock->myMethod()); } } MyMethod is handled by __call() method mercoledì 26 giugno 13
26. verify invocations class MyTest extends PHPUnit_Framework_TestCase { public function testPHPUnitMock() { $mock = $this->getMock('PhakeTest_MockedClass'); $mock->expects($this->once())->method('fooWithArgument') ->with('foo'); $mock->expects($this->once())->method('fooWithArgument') ->with('bar'); $mock->fooWithArgument('foo'); $mock->fooWithArgument('bar'); } } with PHPUnit - BAD! mercoledì 26 giugno 13
27. verify invocations class MyTest extends PHPUnit_Framework_TestCase { public function testPHPUnitMock() { $mock = $this->getMock('PhakeTest_MockedClass'); $mock->expects($this->once())->method('fooWithArgument') ->with('foo'); $mock->expects($this->once())->method('fooWithArgument') ->with('bar'); $mock->fooWithArgument('foo'); $mock->fooWithArgument('bar'); } } with PHPUnit - BAD! //I’m failing, with you! mercoledì 26 giugno 13
28. verify invocations class MyTest extends PHPUnit_Framework_TestCase { public function testPHPUnitMock() { $mock = $this->getMock('PhakeTest_MockedClass'); $mock->expects($this->at(0))->method('fooWithArgument') ->with('foo'); $mock->expects($this->at(1))->method('fooWithArgument') ->with('bar'); $mock->fooWithArgument('foo'); $mock->fooWithArgument('bar'); } } with PHPUnit - BETTER mercoledì 26 giugno 13
29. verify invocations class MyTest extends PHPUnit_Framework_TestCase { public function testPHPUnitMock() { $mock = Phake::mock('PhakeTest_MockedClass'); $mock->fooWithArgument('foo'); $mock->fooWithArgument('bar'); Phake::verify($mock)->fooWithArgument('foo'); Phake::verify($mock)->fooWithArgument('bar'); } } with Phake mercoledì 26 giugno 13
30. verify invocations class MyTest extends PHPUnit_Framework_TestCase { public function testPHPUnitMock() { $mock = Phake::mock('PhakeTest_MockedClass'); $mock->fooWithArgument('foo'); $mock->fooWithArgument('foo'); Phake::verify($mock, Phake::times(2))->fooWithArgument('foo'); } } with Phake - multiple invocation Phake::times($n) Phake::atLeast($n) Phake::atMost($n) options: mercoledì 26 giugno 13
31. verify invocations in order class MyTest extends PHPUnit_Framework_TestCase { public function testPHPUnitMock() { $mock = Phake::mock('PhakeTest_MockedClass'); $mock->fooWithArgument('foo'); $mock->fooWithArgument('bar'); Phake::inOrder( Phake::verify($mock)->fooWithArgument('foo'), Phake::verify($mock)->fooWithArgument('bar') ); } } mercoledì 26 giugno 13
32. verify no interaction class MyTest extends PHPUnit_Framework_TestCase { public function testPHPUnitNoInteraction() { $mock = $this->getMock('PhakeTestCase_MockedClass'); $mock->expects($this->never()) ->method('foo'); //.... } } with PHPUnit mercoledì 26 giugno 13
33. verify no interaction class MyTest extends PHPUnit_Framework_TestCase { public function testPHPUnitNoInteraction() { $mock = $this->getMock('PhakeTestCase_MockedClass'); $mock->expects($this->never()) ->method('foo'); //.... } } with PHPUnit class MyTest extends PHPUnit_Framework_TestCase { public function testPhakeNoInteraction() { $mock = Phake::mock('PhakeTestCase_MockedClass'); //... Phake::verifyNoInteractions($mock); } } with Phake mercoledì 26 giugno 13
34. verify magic calls class MagicClass { public function __call($method, $args) { return '__call'; } } mercoledì 26 giugno 13
35. verify magic calls class MagicClass { public function __call($method, $args) { return '__call'; } } class MagicClassTest extends PHPUnit_Framework_TestCase { public function testMagicCall() { $mock = Phake::mock('MagicClass'); $mock->myMethod(); Phake::verify($mock)->myMethod(); } } mercoledì 26 giugno 13
36. throwing exception class MyClass { ! private $logger; ! ! public function __construct(Logger $logger) ! { ! ! $this->logger = $logger; ! } ! public function processSomeData(MyDataProcessor $processor, MyData $data) ! { ! ! try { ! ! ! $processor->process($data); ! ! } ! ! catch (Exception $e) { ! ! ! $this->logger->log($e->getMessage()); ! ! } ! } } Suppose you have a class that logs a message with the exception message mercoledì 26 giugno 13
37. throwing exception class MyClassTest extends PHPUnit_Framework_TestCase { ! public function testProcessSomeDataLogsExceptions() ! { ! ! $logger = Phake::mock('Logger'); ! ! $data = Phake::mock('MyData'); ! ! $processor = Phake::mock('MyDataProcessor'); ! ! Suppose you have a class that logs a message with the exception message mercoledì 26 giugno 13
38. throwing exception class MyClassTest extends PHPUnit_Framework_TestCase { ! public function testProcessSomeDataLogsExceptions() ! { ! ! $logger = Phake::mock('Logger'); ! ! $data = Phake::mock('MyData'); ! ! $processor = Phake::mock('MyDataProcessor'); ! ! Suppose you have a class that logs a message with the exception message ! ! Phake::when($processor)->process($data) ->thenThrow(new Exception('My error message!'); mercoledì 26 giugno 13
39. throwing exception class MyClassTest extends PHPUnit_Framework_TestCase { ! public function testProcessSomeDataLogsExceptions() ! { ! ! $logger = Phake::mock('Logger'); ! ! $data = Phake::mock('MyData'); ! ! $processor = Phake::mock('MyDataProcessor'); ! ! Suppose you have a class that logs a message with the exception message ! ! Phake::when($processor)->process($data) ->thenThrow(new Exception('My error message!'); ! ! $sut = new MyClass($logger); ! ! $sut->processSomeData($processor, $data); mercoledì 26 giugno 13
40. throwing exception class MyClassTest extends PHPUnit_Framework_TestCase { ! public function testProcessSomeDataLogsExceptions() ! { ! ! $logger = Phake::mock('Logger'); ! ! $data = Phake::mock('MyData'); ! ! $processor = Phake::mock('MyDataProcessor'); ! ! Suppose you have a class that logs a message with the exception message ! ! Phake::when($processor)->process($data) ->thenThrow(new Exception('My error message!'); ! ! $sut = new MyClass($logger); ! ! $sut->processSomeData($processor, $data); ! ! Phake::verify($logger)->log('My error message!'); ! } } mercoledì 26 giugno 13
41. parameter capturing interface CardCollection { public function getNumberOfCards(); } class MyPokerGameTest extends PHPUnit_Framework_TestCase { public function testDealCards() { $dealer = Phake::partialMock('MyPokerDealer'); $players = Phake::mock('PlayerCollection'); $cardGame = new MyPokerGame($dealer, $players); Phake::verify($dealer)->deal(Phake::capture($deck), $players); $this->assertEquals(52, $deck->getNumberOfCards()); } } Class MyPokerDealer { public function getNumberOfCards(){ .. .. $dealer->deal($deck, $players) } } mercoledì 26 giugno 13
42. Phake pear channel-discover pear.digitalsandwich.com pear install digitalsandwich/Phake Available via pear Available via Composer "phake/phake": "dev-master" mercoledì 26 giugno 13
43. Questions? Thanks! Andrea Giuliano @bit_shark mercoledì 26 giugno 13