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Testing @DanToml

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What? Test noun: A procedure intended to establish the quality, performance, or reliability of something, especially before it is taken into widespread use.

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Why?

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Tools

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XCTest // Contrived example test for a mythical add function func test_can_add_two_numbers() { // arrange let firstNumber = 1 let secondNumber = 1 let expectedResult = 2 // act let ! = add(firstNumber, secondNumber) // assert XCTAssertEqual(!, expectedResult) }

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FBSnapshotTestCase // https://github.com/facebook/ios-snapshot-test-case func test_taylor_swift_view_displays_correct_image() { let viewModel = TaylorSwiftImageViewModel.testViewModel() let sut = TaylorSwiftImageView(viewModel: viewModel) FBSnapshotVerifyView(sut) }

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OHHTTPStubs OHHTTPStubs.stubRequestsPassingTest({$0.URL!.host == "mywebservice.com"}) { _ in // Stub it with our "wsresponse.json" stub file (which is in same bundle as self) let fixture = OHPathForFile("wsresponse.json", self.dynamicType) return OHHTTPStubsResponse(fileAtPath: fixture!, statusCode: 200, headers: ["Content-Type":"application/json"]) }

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UI Testing

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Code Coverage

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Architecture

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Modal View Controller

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Massive View Controller

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Breaking it out

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MVVM Model-View-ViewModel

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Dependency Injection & Composability

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Clarity

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Use what works for you

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Lets talk about Testing

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Singletons

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View Models

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Views

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View Controllers

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Non-View Controllers

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Resources 4 I'll be releasing a sample project on GitHub at some point in the next week or two. 4 ObjC.io VIPER: http://bit.ly/1Ht1V6Y 4 ObjC.io MVVM: http://bit.ly/1UNLXJf 4 ObjC.io Lightweight View Controllers: http://bit.ly/ 1K1wAtw 4 WWDC Session 229

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Questions? Find me on Twitter: @dantoml