The Unit Testing of Objective-C

Speaking at Cocoa Studies Kansai

Transcript

1. The Unit Testing of Objective-C [[codes should] beTested];
2. cockscomb
4. Hatena Blog
5. KyotoCamera
6. The Unit Testing of Objective-C [[codes should] beTested];
7. Unit Test Frameworks
8. •OCUnit (SenTestingKit) •GHUnit •Kiwi
9. • Built-in • Easy to setup • Just select “Include Unit Tests” when creating projects • Crazily easy executing • ⌘ + U™ OCUnit
10. #import <SenTestingKit/SenTestingKit.h> @interface Tests : SenTestCase @end @implementation Tests - (void)setUp { [super setUp]; } - (void)tearDown { [super tearDown]; } - (void)testExample { STFail(@"Unit tests are not implemented yet in Tests"); } @end
11. • Very simple • But… wait, • QUESTION: How to test asynchronous process, like delegate and blocks? •ANSWER: Do `while` •or use great third-party plug-ins
12. • Powerful features • Like OCUnit • Supporting asynchronous process • And, powerful features GHUnit
13. #import <GHUnitIOS/GHUnit.h> @interface ExampleTest : GHTestCase { } @end @implementation ExampleTest - (void)setUpClass { } - (void)tearDownClass { } - (void)setUp { } - (void)tearDown { } - (void)testFoo { NSString *a = @"foo"; GHAssertNotNULL(a, nil); NSString *b = @"bar"; GHAssertEqualObjects(a, b, @"A custom error message. a should be equal to: %@.", b); } @end
14. @interface ExampleAsyncTest : GHAsyncTestCase { } @end @implementation ExampleAsyncTest - (void)testURLConnection { [self prepare]; NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http:// www.google.com"]]; NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES]; [self waitForStatus:kGHUnitWaitStatusSuccess timeout:10.0]; } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { [self notify:kGHUnitWaitStatusSuccess forSelector:@selector(testURLConnection)]; } - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { [self notify:kGHUnitWaitStatusFailure forSelector:@selector(testURLConnection)]; } - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { GHTestLog(@"%@", [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease]); } @end
15. are shown in iOS Simulator Testing Results
16. Kiwi • BDD for iOS • Simple to setup and use • Supporting CocoaPods • Supported by AppCode 2.0 • ⌘ + U™, OMG
17. describe(@"Team", ^{ context(@"when newly created", ^{ it(@"should have a name", ^{ id team = [Team team]; [[team.name should] equal:@"Black Hawks"]; }); it(@"should have 11 players", ^{ id team = [Team team]; [[[team should] have:11] players]; }); }); });
18. #import "Kiwi.h" SPEC_BEGIN(SpecName) describe(@"ClassName", ^{ context(@"a state the component is in", ^{ __block id variable = nil; beforeAll(^{}); afterAll(^{}); beforeEach(^{ variable = [MyClass instance]; }); afterEach(^{}); it(@"should do something", ^{ [[variable should] meetSomeExpectation]; }); specify(^{ [variable shouldNotBeNil] }); pending(@"something unimplemented", ^{}); }); }); SPEC_END
19. id car = [Car car]; [car shouldNotBeNil]; [[car should] beKindOfClass:[Car class]]; [[car shouldNot] conformToProtocol:@protocol(FlyingMachine)]; [[[car should] have:4] wheels]; [[theValue(car.speed) should] equal:theValue(42.0f)]; [[[car should] receive] changeToGear:3];
20. id carMock = [Car mock]; [[carMock should] beMemberOfClass:[Car class]]; [[carMock should] receive:@selector(currentGear) andReturn:theValue(3)]; [[theValue(carMock.currentGear) should] equal:theValue(3)]; id carNullMock = [Car nullMock]; [[theValue(carNullMock.currentGear) should] equal:theValue(0)]; [carNullMock applyBrakes]; id flyerMock = [KWMock mockForProtocol: @protocol(FlyingMachine)]; [[flyerMock should] conformToProtocol: @protocol(FlyingMachine)]; [flyerMock stub:@selector(dragCoefficient) andReturn:theValue(17.0f)]; id flyerNullMock = [KWMock nullMockForProtocol: @protocol(FlyingMachine)]; [flyerNullMock takeOff]; [subject stub:(SEL)aSelector];
21. context(@"Fetching service data", ^{ it(@"should receive data within one second", ^{ [[LRResty client] get:@"http://www.example.com" withBlock: ^(LRRestyResponse* r) { NSLog(@"That's it! %@", [r asString]); fetchedData = [r asString]; }]; [[expectFutureValue(fetchedData) shouldEventually] beNonNil]; }); });
22. • Most powerful • Including mocks and stubs • Characteristic style using blocks • Simple and easy • Highly recommended
23. Network Stubs
24. Nocilla • HTTP stubbing for iOS • Easy DSL interface • NSURLProtocol • Supporting AFNetworking
25. stubRequest(@"POST", @"https://api.example.com/dogs.json"). withHeaders(@{ @"Accept": @"application/json", @"X-CUSTOM-HEADER": @"abcf2fbc6abgf" }). withBody(@"{\"name\":\"foo\"}"). andReturn(201). withHeaders(@{ @"Content-Type": @"application/json" }). withBody(@"{\"ok\":true}");
26. Integration Test
27. UIAutomation • Built-in • Instruments • JavaScript interface • UIA* objects
28. var editButton = UIATarget. localTarget(). frontMostApp(). mainWindow(). buttons()[0]; editButton.tap();
29. • Record your operation using Instruments • Executable from command-line • tuneup.js • Assertions • Runner script
30. • There’s so many solutions for TDD Cocoa • Make decision what’s frameworks to use • and I chosen Kiwi, Nocilla, UIAutomation • Test, Test, Test… Overall