Unit Testing on iOS

Talk about TDD and BDD on iOS held at the UIKonf

Transcript

1. Unit Testing on iOS No Voodoo necessary
2. @tibr Tim Brückmann
3. Integration tests Acceptance tests
5. Unit tests
6. RED GREEN REFACTOR TDD
7. RED GREEN REFACTOR TDD
8. RED GREEN REFACTOR TDD
9. RED GREEN REFACTOR TDD
10. Tests are for losers
11. @tibr‘s top five reasons to do TDD (patent pending)
12. Rapid Changes
13. Knowing when to
14. Understanding the design of your code
15. Regression Testing
16. Happiness
17. Behavior Driven Development
18. Executable Specification describe(@"NSNumber", ^{ context(@"when created with an integer value", ^{ __block NSNumber *numberUnderTest; beforeEach(^{ numberUnderTest = [NSNumber numberWithInteger:5]; }); it(@"should hold the correct value", ^{ [[theValue([numberUnderTest integerValue]) should] equal:theValue(5)]; }); }); });
19. Better Architecture
20. Better Architecture describe(@"my custom view with a text field", ^{ context(@"when the value of the text field changes", ^{ it(@"should update the model object", ^{ // change value // model should be updated }); }); });
21. Better Architecture describe(@"my custom view with a text field", ^{ context(@"when the value of the text field changes", ^{ it(@"should update the model object", ^{ // change value // model should be updated }); }); }); MVC, anyone?
22. Tools
24. https://github.com/allending/Kiwi Kiwi BDD for iOS
25. Mocks // create mock object id carMock = [Car mock]; // configure mock object [[carMock should] beMemberOfClass:[Car class]]; [[carMock should] receive:@selector(weight) andReturn:theValue(1500)]; // use mock object [garage parkCar:carMock]; [[theValue(garage.totalWeight) should] equal:theValue(1500)];
26. Stubs // create real object id cruiser = [Cruiser cruiser]; // stub method [[cruiser stubAndReturn:theValue(42.0f)] energyLevelInWarpCore:7]; // access stubbed method float energyLevel = [cruiser energyLevelInWarpCore:7]; [[theValue(energyLevel) should] equal:theValue(42.0f)];
27. Asynchronous Car *car = [[Car alloc] init]; [car tankUpWithSpeed:1.0f]; [[expectFutureValue(theValue(car.gasTankFillLevel)) shouldEventually] equal:theValue(1.0f)];
28. Asynchronous Car *car = [[Car alloc] init]; [car tankUpWithSpeed:0.5f]; [[expectFutureValue(theValue(car.gasTankFillLevel)) shouldEventuallyBeforeTimingOutAfter(10)] equal:theValue(1.0f)];
29. https://github.com/AliSoftware/OHHTTPStubs OHHTTPStubs Super easy network request stubbing [OHHTTPStubs shouldStubRequestsPassingTest:^BOOL(NSURLRequest *request) { // Only stub requests to "*.json" files return [request.URL.absoluteString.lastPathComponent.pathExtension isEqualToString:@"json"]; } withStubResponse:^OHHTTPStubsResponse*(NSURLRequest *request) { // Stub it with our "response.json" stub file return [OHHTTPStubsResponse responseWithFile:@"response.json" contentType:@"text/json" responseTime:2.0]; }];
30. https://github.com/AliSoftware/OHHTTPStubs OHHTTPStubs Super easy network request stubbing [OHHTTPStubs shouldStubRequestsPassingTest:^BOOL(NSURLRequest *request) { // Only stub requests to "*.json" files return [request.URL.absoluteString.lastPathComponent.pathExtension isEqualToString:@"json"]; } withStubResponse:^OHHTTPStubsResponse*(NSURLRequest *request) { // Stub it with our "response.json" stub file return [OHHTTPStubsResponse responseWithFile:@"response.json" contentType:@"text/json" responseTime:2.0]; }];
31. https://github.com/AliSoftware/OHHTTPStubs OHHTTPStubs Super easy network request stubbing [OHHTTPStubs shouldStubRequestsPassingTest:^BOOL(NSURLRequest *request) { // Only stub requests to "*.json" files return [request.URL.absoluteString.lastPathComponent.pathExtension isEqualToString:@"json"]; } withStubResponse:^OHHTTPStubsResponse*(NSURLRequest *request) { // Stub it with our "response.json" stub file return [OHHTTPStubsResponse responseWithFile:@"response.json" contentType:@"text/json" responseTime:2.0]; }];
32. https://github.com/AliSoftware/OHHTTPStubs OHHTTPStubs Super easy network request stubbing [OHHTTPStubs shouldStubRequestsPassingTest:^BOOL(NSURLRequest *request) { // Only stub requests to "*.json" files return [request.URL.absoluteString.lastPathComponent.pathExtension isEqualToString:@"json"]; } withStubResponse:^OHHTTPStubsResponse*(NSURLRequest *request) { // Stub it with our "response.json" stub file return [OHHTTPStubsResponse responseWithFile:@"response.json" contentType:@"text/json" responseTime:2.0]; }]; OHHTTPStubsDownloadSpeedGPRS OHHTTPStubsDownloadSpeedEDGE OHHTTPStubsDownloadSpeed3G OHHTTPStubsDownloadSpeed3GPlus OHHTTPStubsDownloadSpeedWifi
33. Async + Network context(@"when creating a task", ^{ beforeEach(^{ [OHHTTPStubs shouldStubRequestsPassingTest:^BOOL(NSURLRequest *request) { return [request.URL.lastPathComponent isEqualToString:@"tasks.json"]; } withStubResponse:^OHHTTPStubsResponse *(NSURLRequest *request) { return [OHHTTPStubsResponse responseWithFile:@"todo_create.json" contentType:@"application/json" responseTime:1.0]; }]; }); it(@"should parse the response", ^{ task.text = @"new task"; [task create]; [[expectFutureValue(theValue(task.remoteIDValue)) shouldEventuallyBeforeTimingOutAfter(3)] equal:theValue(75704)]; }); });
34. Core Data NSBundle *bundle = [NSBundle bundleForClass:klass]; NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:[NSArray arrayWithObject:bundle]]; NSPersistentStoreCoordinator *persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:managedObjectModel]; [persistentStoreCoordinator addPersistentStoreWithType:NSInMemoryStoreType configuration:nil URL:nil options:nil error:nil]; NSManagedObjectContext *managedObjectContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType]; managedObjectContext.persistentStoreCoordinator = persistentStoreCoordinator; https://github.com/rheinfabrik/RFTesting
35. Core Data NSBundle *bundle = [NSBundle bundleForClass:klass]; NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:[NSArray arrayWithObject:bundle]]; NSPersistentStoreCoordinator *persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:managedObjectModel]; [persistentStoreCoordinator addPersistentStoreWithType:NSInMemoryStoreType configuration:nil URL:nil options:nil error:nil]; NSManagedObjectContext *managedObjectContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType]; managedObjectContext.persistentStoreCoordinator = persistentStoreCoordinator; https://github.com/rheinfabrik/RFTesting
36. Core Data NSBundle *bundle = [NSBundle bundleForClass:klass]; NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:[NSArray arrayWithObject:bundle]]; NSPersistentStoreCoordinator *persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:managedObjectModel]; [persistentStoreCoordinator addPersistentStoreWithType:NSInMemoryStoreType configuration:nil URL:nil options:nil error:nil]; NSManagedObjectContext *managedObjectContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType]; managedObjectContext.persistentStoreCoordinator = persistentStoreCoordinator; https://github.com/rheinfabrik/RFTesting
37. nibs/xibs // Use in initializers NSBundle *bundle = [NSBundle bundleForClass:[self class]]; // OS X — NSWindowController NSString *path = [bundle pathForResource:@"FooWindowController" ofType:@"nib"]; self = [self initWithWindowNibPath:path owner:self]; // iOS — UIViewController self = [super initWithNibName:@"FooViewController" bundle:bundle];
38. Command Line
39. Command Line https://github.com/sgleadow/xcodetest ./build_and_run_unit_tests.sh  MyApp  MyAppTests xcodetest
40. Demo!
41. Stay reasonable
42. Thanks! Now go forth and test Say hi: @tibr