Automated Testing with Objective-C

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Automated Testing with Objective-C Ben Scheirman

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Ben Scheirman Director of Development at ChaiOne Houston,

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nsscreencast.com

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Automated Tests

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Automated Tests

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Does your application work?

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˒ˑˑˑˑ

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Application Code Automated Tests

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Application Code Automated Tests

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Application Code Automated Tests ✓ ✓ ✓ ✓ x x

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Unit Tests Integration Tests Acceptance Tests

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Unit Tests

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Unit Tests

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Integration Tests

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Acceptance Tests

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Acceptance Tests

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What's in a test run?

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What's in a test run? Setup Test Test Tear Down Setup Tear Down

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What's in a test? Test Arrange Act Assert

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What's in a test? Test

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What's in a test? Test - (void)test_adding_numbers { Calculator *calc = [Calculator new]; int sum = [calc add:x to:y]; XCTAssertEquals(7, sum, @"math is hard :("); }

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What's in a test? Test - (void)test_adding_numbers { Calculator *calc = [Calculator new]; int sum = [calc add:x to:y]; XCTAssertEquals(7, sum, @"math is hard :("); } Arrange

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What's in a test? Test - (void)test_adding_numbers { Calculator *calc = [Calculator new]; int sum = [calc add:x to:y]; XCTAssertEquals(7, sum, @"math is hard :("); } Act

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What's in a test? Test - (void)test_adding_numbers { Calculator *calc = [Calculator new]; int sum = [calc add:x to:y]; XCTAssertEquals(7, sum, @"math is hard :("); } Assert

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1 assertion per test

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Unit Tests come default on Xcode 5

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⌘U

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Demo: Guess the number game

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How do we know what number it will generate?

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Game

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Game RNG

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Game RNG

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Game RNG

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Game RNG NG Stub

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Demo: Stubbing with OCMock

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What about... View Controllers? Interface Builder? Storyboards?

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DETOUR AHEAD Behavior Driven Development

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GIVEN WHEN THEN

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GIVEN WHEN THEN Some Behavior

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GIVEN WHEN THEN Some Behavior I do X

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GIVEN WHEN THEN Some Behavior I do X Y should happen

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SpecBegin(CalculatorSpec) describe(@"Calculator", ^{ __block Calculator *_calc; beforeEach(^{ _calc = [Calculator new]; }); it(@"should add two numbers", ^{ int sum = [_calc add:5 to:7]; expect(sum).to.equal(12); }); }); SpecEnd Specta / Expecta

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Kiwi expect(sum).to.equal(12); [theValue(sum) should] equal:theValue(12)]; Expecta

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Kiwi Leverage OCMock for mocks & stubs Built-in powerful mocking & stubbing functionality Expecta

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UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil]; UINavigationController *nav = [mainStoryboard instantiateInitialViewController]; ViewController *vc = (ViewController *)[nav visibleViewController]; UIView *view = vc.view; expect(view).toNot.beNil(); Testing Storyboards

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UIButton *button = _vc.loginButton; NSArray *actions = [button actionsForTarget:_vc forControlEvent:UIControlEventTouchUpInside ]; expect(actions[0]).to.equal(@"loginTapped:"); Testing Wired Actions

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Testing Block Based interaction VC Login Service External API

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Testing Block Based interaction VC Login Service External API

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Testing Block Based interaction VC Login Service External API ^{ } ^(User *user){ if (user) { NSLog(@"Logged in!"); } else { NSLog(@"Invalid login..."); } }

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Testing Block Based interaction VC Login Service External API ^{ } ^(User *user){ if (user) { NSLog(@"Logged in!"); } else { NSLog(@"Invalid login..."); } }

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VC Login Service External API ^{ }

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VC Login Service External API ^{ } System

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VC Login Service External API ^{ } System

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Step 1: Verify Login Service is called

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describe(@"logging in", ^{ it(@"should verify username & password w/ login svc", ^{ id mockLoginService = [OCMockObject mockForClass:[LoginService class]]; [[mockLoginService expect] verifyUsername:@"user1" password:@"password1" completion: [OCMArg any]]; _vc.loginService = mockLoginService; _vc.usernameTextField.text = @"user1"; _vc.passwordTextField.text = @"password1"; [_vc loginTapped:nil]; [mockLoginService verify]; }); });

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Step 2: Define the behavior when the login service calls back

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Step 2: Define the behavior when the login service calls back 2 cases: success & failure

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describe(@"logging in", ^{ it(@"should welcome the user when the login is valid", ^{ id mockLoginService = [OCMockObject mockForClass:[LoginService class]]; [[mockLoginService expect] verifyUsername:[OCMArg any] password:[OCMArg any] completion:... ]; _vc.loginService = mockLoginService; [_vc loginTapped:nil]; [mockLoginService verify]; }); });

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[[mockLoginService expect] verifyUsername:[OCMArg any] password:[OCMArg any] completion:[OCMArg checkWithBlock:^BOOL(id completionBlock) { // fake login successful for a user id mockUser = [OCMockObject mockForClass:[User class]]; completionBlock(mockUser); return YES; // signify that this argument is valid }]];

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Where to go from here? Explore Acceptance Test Frameworks: KIF Frank UIAutomation

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Some Parting Tips... If it's hard to test, improve your design

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Some Parting Tips... If it's hard to test, improve your design Try to test 1 thing

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Some Parting Tips... If it's hard to test, improve your design Try to test 1 thing Write tests first to avoid creating untestable designs

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Some Parting Tips... If it's hard to test, improve your design Try to test 1 thing Write tests first to avoid creating untestable designs Use a continuous integration server

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Some Parting Tips... If it's hard to test, improve your design Try to test 1 thing Write tests first to avoid creating untestable designs Use a continuous integration server PRACTICE!

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Thank you! Ben Scheirman @subdigital benscheirman.com