Testing on iOS

A presentation by Joris Dubois (AppFoundry) for the December 2015 Mobel user group meetup

Transcript

1. Your hosts
   Filip Maelbrancke
   Consultant @ AppFoundry
   filip.maelbrancke@appfoundry.be
   @fmaelbrancke
   Joris Dubois
   Consultant @ AppFoundry
   joris.dubois@appfoundry.be
   @DuboisJoris
   

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2. AppFoundry
   appfoundry.be
   

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4. Patterns
   

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5. Dependency Injection
   a 25-dollar term for a 5-cent concept
   

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6. Coding Example
   DI: Spot the problem
   #import
   @interface UserDefaultManager : NSObject
   - (void)registerLeetInteger;
   @end
   #import "UserDefaultManager.h"
   @implementation UserDefaultManager
   - (void)registerLeetInteger {
   [[[NSUserDefaults alloc] initWithSuiteName:@"LeetAppGroup"] setInteger:1337 forKey:@"leet"];
   }
   @end
   

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7. Coding Example
   DI: Constructor Injection
   #import
   @interface UserDefaultManager : NSObject
   - (instancetype)initWithUserDefaults:(NSUserDefaults *)userDefaults;
   - (void)registerLeetInteger;
   @end
   #import "UserDefaultManager.h"
   @implementation UserDefaultManager {
   NSUserDefaults *_userDefaults;
   }
   //Constructor Injection
   - (instancetype)initWithUserDefaults:(NSUserDefaults *)userDefaults {
   self = [super init];
   if(self) {
   _userDefaults = userDefaults;
   }
   return self;
   }
   - (void)registerLeetInteger {
   [_userDefaults setInteger:1337 forKey:@"leet"];
   }
   @end
   

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8. Coding Example
   DI: Method Injection
   #import
   @interface UserDefaultManager : NSObject
   - (void)registerLeetIntegerOnUserDefaults:(NSUserDefaults *)userDefaults;
   @end
   #import "UserDefaultManager.h"
   @implementation UserDefaultManager
   //Method Injection
   - (void)registerLeetIntegerOnUserDefaults:(NSUserDefaults *)userDefaults {
   [userDefaults setInteger:1337 forKey:@"leet"];
   }
   @end
   

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9. Coding Example
   DI: Property Injection
   #import
   @interface UserDefaultManager : NSObject
   //Property Injection
   @property (nonatomic, strong) NSUserDefaults *userDefaults;
   - (void)registerLeetInteger;
   @end
   #import "UserDefaultManager.h"
   @implementation UserDefaultManager
   - (void)registerLeetInteger {
   [self.userDefaults setInteger:1337 forKey:@"leet"];
   }
   @end
   

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10. MVVM
    

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11. MVC
    

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12. MASSIVE
    View Controller
    

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13. View Controller
    View Model
    MVVM
    View Controller
    View Model
    View Model
    

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14. Unit Testing
    frameworks & code coverage
    

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15. OCMock
    

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16. Coding Example
    OCMock: Mocking
    Class mock OCMClassMock([SomeClass class]);
    Protocol mock OCMProtocolMock(@protocol(SomeProtocol));
    Strict class & protocol
    mock
    OCMStrictClassMock([SomeObject class]);
    OCMStrictProtocolMock(@protocol(SomeProtocol));
    Partial mock OCMPartialMock(anObject);
    Observer mock OCMObserverMock()
    

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17. Coding Example
    OCMock: Stubbing
    OCMStub([mock someMethod]).andReturn(anObject);
    OCMStub([mock someMethodReturningABool]).andReturn(YES);
    OCMStub([mock someMethod]).andCall(anotherObject, @selector(aDifferentMethod));
    OCMStub([mock someMethod]).andThrow(anException);
    

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18. Coding Example
    OCMock: Verification
    OCMVerify([mock someMethod]);
    

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19. Coding Example
    OCMock
    - (void)populateView:(UIView *)view withData:(id)data {
    PersonView *personView = (PersonView *)view;
    PersonObject *personObject = (PersonObject *)data;
    [_imageService fetchImageFromURL:personObject.imageURL fallBackImage:[UIImage
    personFallBackImage] forImageView:personView.personImageView];
    }
    - (void)testPopulateViewWithDataDoesInvokeImageServiceForPersonImageViewWithExpectedFallbackImage {
    UIImageView *givenImageView = [[UIImageView alloc] init];
    OCMExpect(_view.personImageView).andReturn(givenImageView);
    [_populator populateView:_view withData:_data];
    OCMVerify([_imageService fetchImageFromURL:_data.imageURL fallBackImage:[UIImage personFallBackImage]
    forImageView:givenImageView]);
    }
    

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20. OCMockito
    personal favorite
    

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21. Coding Example
    OCMockito: Mocking
    Class mock mockClass([SomeClass class]);
    Protocol mock
    mockProtocol(@protocol(SomeProtocol));
    mockProtocolWithoutOptionals(@protocol(
    SomeProtocol));
    Class & protocol mock
    mockObjectAndProtocol([SomeObject class],
    @protocol(SomeProtocol));
    

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22. Coding Example
    OCMockito: Stubbing
    [given([mock someMethod]) willReturn:anObject];
    [given([mock aMethodReturningABoolean]) willReturnBool:YES];
    

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23. Coding Example
    OCMockito: Verification
    [verify(mock) someMethod];
    [verifyCount(mock, times(1)) someMethod];
    [verifyCount(mock, never()) someMethod];
    

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24. Coding Example
    OCMockito
    - (void)populateView:(UIView *)view withData:(id)data {
    PersonView *personView = (PersonView *)view;
    PersonObject *personObject = (PersonObject *)data;
    [_imageService fetchImageFromURL:personObject.imageURL fallBackImage:[UIImage
    personFallBackImage] forImageView:personView.personImageView];
    }
    - (void)testPopulateViewWithDataDoesInvokeImageServiceForPersonImageViewWithExpectedFallbackImage {
    UIImageView *givenImageView = [[UIImageView alloc] init];
    [given(_view.personImageView) willReturn:givenImageView];
    [_populator populateView:_view withData:_data];
    [verify(_imageService) fetchImageFromURL:_data.imageURL fallBackImage:[UIImage personFallBackImage]
    forImageView:givenImageView];
    }
    

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25. Expecta
    

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26. Coding Example
    Expecta
    Object matchers
    .conformsTo(@protocol(SomeProtocol))
    .equal(anObject)
    .beIdenticalTo(anObject)
    .beNil()
    .beInstanceOf([SomeClass class])
    Number matchers
    .beCloseTo(@3)
    .beGreaterThan(@3)
    .beGreaterThanOrEqualTo(@3)
    .beLessThan(@3)
    .beLessThanOrEqualTo(@3)
    .beFalsy()
    .beTruthy()
    

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27. Coding Example
    Expecta
    Text matchers
    .beginWith(@"someString")
    .endWith(@"someString")
    .match(@"regex")
    Collection matchers
    .contain(objectA, objectB)
    .beSupersetOf(objectA, objectB)
    .haveCountOf()
    .beEmpty()
    Logical matchers .notTo
    Async matchers
    .will
    .willNot
    .after(2)
    

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28. Coding Example
    Expecta
    - (void)populateView:(UIView *)view withData:(id)data {
    PersonView *personView = (PersonView *)view;
    PersonObject *personObject = (PersonObject *)data;
    personView.ageLabel.text = personObject.age.stringValue;
    }
    - (void)testPopulateViewWithDataDoesPopulateAgeLabelWithAge {
    UILabel *givenLabel = [[UILabel alloc] init];
    OCMExpect(_view.ageLabel).andReturn(givenLabel);
    [_populator populateView:_view withData:_data];
    expect(givenLabel.text).to.equal(_data.age.stringValue);
    }
    

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29. OCHamcrest
    personal favorite
    

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30. Coding Example
    OCHamcrest
    Object matchers
    conformsTo(@protocol(SomeProtocol))
    equalTo(anObject)
    sameInstance(anObject)
    hasProperty(@"propertyName", @“propertyValue")
    instanceOf([SomeClass class])
    Number matchers
    closeTo(@3)
    greaterThan(@3)
    greaterThanOrEqualTo(@3)
    lessThan(@3)
    lessThanOrEqualTo(@3)
    isFalse()
    isTrue()
    

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31. Coding Example
    OCHamcrest
    Text matchers
    containsSubstring(@"someString");
    startsWith(@"someString");
    endsWith(@"someString");
    equalToIgnoringCase(@"someString");
    Collection matchers
    contains(objectA, objectB)
    hasItems(objectA, objectB)
    everyItem()
    isEmpty()
    Logical matchers
    isNot()
    anything()
    allOf()
    

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32. Coding Example
    OCHamcrest
    - (void)populateView:(UIView *)view withData:(id)data {
    PersonView *personView = (PersonView *)view;
    PersonObject *personObject = (PersonObject *)data;
    personView.ageLabel.text = personObject.age.stringValue;
    }
    - (void)testPopulateViewWithDataDoesPopulateAgeLabelWithAge {
    UILabel *givenLabel = [[UILabel alloc] init];
    [given(_view.ageLabel) willReturn:givenLabel];
    [_populator populateView:_view withData:_data];
    assertThat(givenLabel.text, is(equalTo(_data.age.stringValue));
    }
    

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33. Specta
    

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34. Coding Example
    Specta
    SpecBegin(_PersonViewPopulator)
    describe(@"PersonViewPopulator", ^{
    __block PersonViewPopulator *_populator;
    __block PersonObject *_data;
    __block PersonView *_view;
    __block id _imageService;
    __block NSURL *_imageURL;
    beforeEach(^{
    _imageURL = [[NSURL alloc] initWithString:@"http://www.apple.com"];
    _view = OCMClassMock([PersonView class]);
    _imageService = OCMProtocolMock(@protocol(ImageService));
    _populator = [[PersonViewPopulator alloc] initWithImageService:_imageService];
    _data = [[PersonObject alloc] initWithName:@"expectedName" imageURL:_imageURL
    slogan:@"expectedSlogan" location:@"expectedLocation" age:@25];
    });
    it(@"does invoke image service with expected fallback image", ^{
    UIImageView *givenImageView = [[UIImageView alloc] init];
    OCMExpect(_view.personImageView).andReturn(givenImageView);
    [_populator populateView:_view withData:_data];
    OCMVerify([_imageService fetchImageFromURL:_data.imageURL fallBackImage:[UIImage
    personFallBackImage] forImageView:givenImageView]);
    });
    });
    SpecEnd
    

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35. Code coverage
    live demo
    

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36. UI Testing
    

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37. UI testing in Xcode
    live demo
    

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38. KIF
    live demo
    

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39. Clean Code - Robert C. Martin
    Test-Driven iOS Development - Graham Lee
    Test-Driven Development by Example - Kent Beck
    

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40. User feedback
    

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41. A/B testing
    

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44. B
    A
    

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45. Questions?
    Joris Dubois
    Consultant @ AppFoundry
    joris.dubois@appfoundry.be
    @DuboisJoris
    

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