ダックタイピングとidでUserDefaultsをモック化する

https://fortee.jp/iosdc-japan-2019/proposal/873b4cdb-4c92-4111-bf0b-67a67dbb242e

Transcript

1. μοΫλΠϐϯάͱJEͰ 6TFS%FGBVMUTΛϞοΫԽ͢Δ 
   J04%$
   +BQBO
   
   EBZ
   
   5SBDL
   &
2. struct Me { let name = "Takuhiro Muta" let aka = "417.72KI" let twitter = "417_72ki" let qiita = "417_72ki" let gitHub = "417-72KI" let products = [ "BuildConfig.swift", "MockUserDefaults", ] let workAt = [ "Rhizome Inc.": "2014/04~2018/01", "iRidge Inc.": "2018/02~2019/08", "WealthNavi Inc.": "2019/09~", ] } TFMGEFTDSJQUJPO
3. "HFOEB w ςετͱ6TFS%FGBVMUT
   w μοΫλΠϐϯά
   w JEܕ
   w .PDL6TFS%FGBVMUT
4. ςετͱ6TFS%FGBVMUT
5. ςετͱ6TFS%FGBVMUT w 6OJU5FTUΛߟ͑Δ্Ͱ6TFS%FGBVMUTͷѻ͍͸ॏཁ
   w 6TFS%FGBVMUTΛ5FTUBCMFʹ͍ͨ͠
   w QSPUPDPMΛט·ͤΔ
   w TVJUF/BNFΛ࢖͏
6. QSPUPDPMΛט·ͤΔ protocol UserDefaultsProtocol: class { func object(forKey defaultName: String) -> Any? func set(_ value: Any?, forKey defaultName: String) func string(forKey defaultName: String) -> String? ɾ ɾ ɾ } extension UserDefaults: UserDefaultsProtocol {}
7. QSPUPDPMΛט·ͤΔ class MockUserDefaults { private var mockDictionary: [String: Any] = [:] } extension MockUserDefaults: UserDefaultsProtocol { func object(forKey defaultName: String) -> Any? { return mockDictionary[defaultName] } func set(_ value: Any?, forKey defaultName: String) { mockDictionary[defaultName] = value } ɾ ɾ ɾ }
8. QSPUPDPMΛט·ͤΔ protocol UseCase { var userDefaults: UserDefaultsProtocol { get } func doSomething() } extension UseCase { func doSomething() { userDefaults.set("bar", forKey: "foo") } } class MixInUseCase: UseCase { let userDefaults: UserDefaultsProtocol = UserDefaults.standard } class TestUseCase: UseCase { let userDefaults: UserDefaultsProtocol = MockUserDefaults() } "QQ 5FTU
9. TVJUF/BNFΛ࢖͏ protocol UseCase { var userDefaults: UserDefaults { get } func doSomething() } extension UseCase { func doSomething() { userDefaults.set("bar", forKey: "foo") } } class MixInUseCase: UseCase { let userDefaults: UserDefaults = .standard } class TestUseCase: UseCase { let userDefaults: UserDefaults = .init(suiteName: "Mock")! } "QQ 5FTU
10. ςετͱ6TFS%FGBVMUT w 6TFS%FGBVMUTΛ5FTUBCMFʹ͍ͨ͠
    w QSPUPDPMΛט·ͤΔ
    w طʹ6TFS%FGBVMUTΛϓϩύςΟͱͯ͠࢖༻͍ͯ͠Δ ৔߹ɺطଘίʔυʹखΛೖΕΔඞཁ͕͋Δ
    w TVJUF/BNFΛ࢖͏
    w /4)PNF%JSFDUPSZ -JCSBSZ1SFGFSFODFT TVJUF/BNF QMJTU͕࡞੒͞ΕΔ
    w ςετͰӬଓྖҬΛ͍͡Γͨ͘͸ͳ͍
11. ςετͱ6TFS%FGBVMUT w 6TFS%FGBVMUTΛ5FTUBCMFʹ͍ͨ͠
    w QSPUPDPMΛט·ͤΔ
    w TVJUF/BNFΛ࢖͏
    w μοΫλΠϐϯά
    Λ࢖ͬͨࠇຐज़
12. μοΫλΠϐϯά
13. μοΫλΠϐϯά w ܕ෇͚ʹؔ͢Δߟ͑ํͷҰͭ
    w ಈతܕ෇͚ݴޠͰ࢖ΘΕΔ FH
    3VCZ
    1ZUIPO
    w ΦϒδΣΫτࣗମ͕ϝιου΍ϓϩύςΟΛ͔࣋ͭͰ൑ఆ OPU
    ܕ r%BWF
    5IPNBT l*G
    JU
    XBMLT
    MJLF
    B
    EVDL
    BOE
    RVBDLT
    MJLF
    B
    EVDL
    JU
    NVTU
    CF
    B
    EVDLz
14. Ұൠతͳ੩తܕ෇͚
    ී௨ʹΫϥεࢦఆ
    ݘ
    ʹରͯ͠ ૸Εʂ ϫϯʂ
15. Ұൠతͳ੩తܕ෇͚
    JOUFSGBDFʹΑΔந৅Խ
    ಈ෺
    ʹରͯ͠ ૸Εʂ ϫϯʂ
16. μοΫλΠϐϯάʹΑΔ
    ಈతܕ෇͚ Կ͔͸஌ΒΜ͕ͱΓ͋͑ͣ
    ૸Εʂ Կ͔͸෼͔Βͳ͍͚Ͳ
    ૸ΕͬͯݴΘΕͨΒ
    ૸Δ͸ͣ
17. ϫϯʂ μοΫλΠϐϯάʹΑΔ
    ಈతܕ෇͚ Կ͔͸஌ΒΜ͕ͱΓ͋͑ͣ
    ૸Εʂ
18. 0CKFDUJWF$ʹ͓͚Δ
    μοΫλΠϐϯά @interface Duck: NSObject - (void)walk; - (void)quack; @end @implementation Duck - (void)walk { NSLog(@"Duck walking"); } - (void)quack { NSLog(@"Quack!!"); } @end @interface Dog: NSObject - (void)walk; - (void)bark; @end @implementation Dog - (void)walk { NSLog(@"Dog walking"); } - (void)bark { NSLog(@"Bark!!"); } @end void walkAndQuack(id duck) { [duck walk]; [duck quack]; }
19. 0CKFDUJWF$ʹ͓͚Δ
    μοΫλΠϐϯά walkAndQuack([Duck new]); // Duck walking // Quack!! walkAndQuack([Dog new]); // Dog walking // unrecognized selector sent to instance
20. 0CKFDUJWF$ʹ͓͚Δ
    μοΫλΠϐϯά void walkAndQuack(id duck) { [duck walk]; [duck quack]; } walkAndQuack([Duck new]); walkAndQuack([Dog new]);
21. 0CKFDUJWF$ʹ͓͚Δ
    μοΫλΠϐϯά void walkAndQuack(Duck *duck) { [duck walk]; [duck quack]; } walkAndQuack([Duck new]); walkAndQuack([Dog new]); *ODPNQBUJCMF
    QPJOUFS
    UZQFT
    QBTTJOH
    %PH
    
    UP
    QBSBNFUFS
    PG
    UZQF
    %VDL
     ܯࠂ͕ग़Δ͚ͩͰϏϧυ͸௨Δ
    
22. 0CKFDUJWF$ͷܕγεςϜ w ऑ͍੩తܕ෇͚
    w ࣮ߦ࣌ʹܕͷνΣοΫΛ͠ͳ͍
    w ܕ͕Ұக͠ͳ͍ΦϒδΣΫτΛ୅ೖͯ͠΋
 ίϯύΠϧΤϥʔʹͳΒͳ͍ ܯࠂͷΈ
    w ϝιουΛݺͿࡍʹ໰୊͕͋ΔͱΫϥογϡ͢Δ
    w +BWB΍4XJGU͸ڧ͍੩తܕ෇͚
23. ڧ͍ܕ෇͚
    ͱ
    ऑ͍ܕ෇͚ 4USJOH <
    
    
    
    
    ߴࡔึ೫Ռ
    
    
    
    
    Ҁ੉ֆཬ
    
    > ऑ͍ܕ෇͚ ڧ͍ܕ෇͚
24. ऑ͍ܕ෇͚ w ࣮ߦ࣌ʹܕͷνΣοΫΛ͠ͳ͍
    w ܕͷνΣοΫΛͤͣʹϝιουΛ࣮ߦ͢Δ
    w ֨ೲ͞Ε͍ͯΔΦϒδΣΫτ͕ͦͷϝιουΛ࣮ߦͰ ͖Ε͹0, %FMFHBUF
25. @protocol UITableViewDataSource<NSObject> @required - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section; - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath; @optional - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView; - (nullable NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section; - (nullable NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section; ɾ ɾ ɾ %FMFHBUFͱμοΫλΠϐϯά ࣮૷Λڧ੍͠ͳ͍ϝιου܈
26. @implementation UITableView ɾ ɾ ɾ - (NSInteger)numberOfSections { if ([self.dataSource respondsToSelector:@selector(numberOfSectionsInTableView:)]) { return [self.dataSource numberOfSectionsInTableView:self]; } else { return 1; } } ɾ ɾ ɾ @end %FMFHBUFͱμοΫλΠϐϯά ϝιου͕࣮૷͞Ε͍ͯΔ͔νΣοΫ
27. %FMFHBUFͱμοΫλΠϐϯά @interface HogeViewController : UIViewController <UITableViewDataSource, UITableViewDelegate> @property (nonatomic, weak) IBOutlet UITableView *tableView; @end @implementation HogeViewController - (void)viewDidLoad { [super viewDidLoad]; self.tableView.dataSource = self; self.tableView.delegate = self; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { ɾɾɾ } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { ɾɾɾ } @end ϓϩτίϧએݴ σϦήʔτϝιου
28. %FMFHBUFͱμοΫλΠϐϯά @interface HogeViewController : UIViewController <UITableViewDataSource, UITableViewDelegate> @property (nonatomic, weak) IBOutlet UITableView *tableView; @end @implementation HogeViewController - (void)viewDidLoad { [super viewDidLoad]; self.tableView.dataSource = self; self.tableView.delegate = self; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { ɾɾɾ } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { ɾɾɾ } @end OVNCFS0G4FDUJPOT*O5BCMF7JFX͕࣮૷͞Ε͍ͯͳ͍ͷͰTFDUJPO͸
29. %FMFHBUFͱμοΫλΠϐϯά @interface HogeViewController : UIViewController <UITableViewDataSource, UITableViewDelegate> @property (nonatomic, weak) IBOutlet UITableView *tableView; @end @implementation HogeViewController - (void)viewDidLoad { [super viewDidLoad]; self.tableView.dataSource = self; self.tableView.delegate = self; } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 2 } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { ɾɾɾ } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { ɾɾɾ } @end OVNCFS0G4FDUJPOT*O5BCMF7JFX͕࣮૷͞ΕͯΛฦ͢Α͏ʹ
30. @interface HogeViewController : UIViewController @property (nonatomic, weak) IBOutlet UITableView *tableView; @end @implementation HogeViewController - (void)viewDidLoad { [super viewDidLoad]; self.tableView.dataSource = self; self.tableView.delegate = self; } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 2 } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { ɾɾɾ } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { ɾɾɾ } @end %FMFHBUFͱμοΫλΠϐϯά "TTJHOJOH
    UP
    JE6*5BCMF7JFX%BUB4PVSDF
    @/VMMBCMF
    GSPN
    JODPNQBUJCMF
    UZQF
    )PHF7JFX$POUSPMMFS
    DPOTU
    @@TUSPOH ϓϩτίϧએݴΛফͯ͠Έͨ৔߹ ܯࠂ͕ग़Δ͚ͩͰϏϧυ͸௨Δ
    Ϋϥογϡ΋ͤͣ5BCMF7JFXͱͯ͠ػೳ͢Δ
    
31. JEܕ
32. JEܕ w 0CKFDUJWF$ಠࣗͷ൚༻σʔλܕ
    w +BWBͰݴ͏0CKFDUɺ4XJGUͰݴ͏"OZ
    w ΦϒδΣΫτͷϙΠϯλΛอ࣋
    w Ωϟετ͢Δ͜ͱͳ͘୅ೖ΍ϝιουݺͼग़͕͠Մೳ
    w ܕ҆શੑΛࣺͯͯॊೈੑʹεςʔλεΛৼͬͯΔ
33. NSArray *array = @[ @{@"hoge":@"fuga"}, ]; for (NSObject *obj in array) { NSLog([obj objectForKey:@"hoge"]); } JEܕͷԸܙ /P
    WJTJCMF
    !JOUFSGBDF
    GPS
    /40CKFDU
    EFDMBSFT
    UIF
    TFMFDUPS
    PCKFDU'PS,FZ
34. NSArray *array = @[ @{@"hoge":@"fuga"}, ]; for (NSObject *obj in array) { NSLog([(NSDictionary *)obj objectForKey:@"hoge"]); } JEܕͷԸܙ Ωϟετ͢Δ͜ͱͰݺͼग़ͤΔΑ͏ʹ
35. NSArray *array = @[ @{@"hoge":@"fuga"}, ]; for (id obj in array) { NSLog([obj objectForKey:@"hoge"]); } JEܕͷԸܙ Ωϟετͤͣʹ/4%JDUJPOBSZͱͯ͠ѻ͏͜ͱ͕Ͱ͖Δ
36. NSArray *array = @[ @{@"hoge":@"fuga"}, ]; for (NSDictionary *obj in array) { NSLog([obj objectForKey:@"hoge"]); } JEܕͷԸܙ /4%JDUJPOBSZͱͯ͠औΓग़ͤΔ ॊೈੑͷߴ͍ίʔσΟϯά͕Մೳʹ
37. NSArray *array = @[ @{@"hoge":@"fuga"}, @"hogehoge" ]; for (NSDictionary *obj in array) { NSLog([obj objectForKey:@"hoge"]); } JEܕͷԸܙ GVHB
38. NSArray *array = @[ @{@"hoge":@"fuga"}, @"hogehoge" ]; for (NSDictionary *obj in array) { NSLog([obj objectForKey:@"hoge"]); } JEܕͷԸܙ VOSFDPHOJ[FE
    TFMFDUPS
    TFOU
    UP
    JOTUBODF
    
39. NSArray <NSDictionary <NSString *, id> *> *array = @[ @{@"hoge":@"fuga"}, @"hogehoge" ]; for (NSDictionary <NSString *, id> *obj in array) { NSLog([obj objectForKey:@"hoge"]); } -JHIUXFJHIU
    (FOFSJDT 0CKFDU
    PG
    UZQF
    /44USJOH
    
    JT
    OPU
    DPNQBUJCMF
    XJUI
    BSSBZ
    FMFNFOU
    UZQF
    /4%JDUJPOBSZ/44USJOH
    JE
    
40. 6TFS%FGBVMUTͱμοΫλΠϐϯά
41. w ऑ͍੩తܕ෇͚
    w ࣮ߦ࣌ʹܕͷνΣοΫΛ͠ͳ͍
    w ܕͷνΣοΫΛͤͣʹϝιουΛ࣮ߦ͢Δ
    w ֨ೲ͞Ε͍ͯΔΦϒδΣΫτ͕ͦͷϝιουΛ࣮ߦͰ͖Ε͹0, 6TFS%FGBVMUTͱμοΫλΠϐϯά /46TFS%FGBVMUT͕͍࣋ͬͯΔ
    ϝιουΛͦͬ͘ΓਅࣅͨΫϥεΛ࡞ِͬͯ૷ͯ͋͛͠Δ
42. .PDL6TFS%FGBVMUT
43. .PDL6TFS%FGBVMUT IUUQTHJUIVCDPN,*.PDL6TFS%FGBVMUT
44. %FNP
45. ஫ҙ w μοΫλΠϐϯάࣗମ͸͋͘·Ͱख๏ ߟ͑ํ Ͱ͋Γɺ
 ภʹࠇຐज़ͩͱ͸ݴ͍੾Εͳ͍
    w ࣮ࡍɺ1ZUIPO΍1)1ͳͲͷಈతܕ෇͚ܥݴޠͰ͸͜ͷ ߟ͑ํʹج͍ͮͨϓϩάϥϛϯά͕ߦΘΕΔ
    w ࢍ൱͸͋Δ͕ɺ͜ΕͰϙϦϞʔϑΟζϜΛ࣮ݱ͍ͯ͠Δ ͱ͍͏આ΋͋Δ
46. ·ͱΊ w 0CKFDUJWF$͸ऑ͍ܕ෇͚ͳͷͰશؔ͘܎ແ͍ΫϥεͷΦ ϒδΣΫτΛ୅ೖͰ͖Δ
    w μοΫλΠϐϯάʹΑͬͯ/46TFS%FGBVMUTͱಉ͡ϝ ιουΛએݴͨ͠ผͷΫϥεΛએݴِͯ͠૷͕Մೳʹ
    w JEܕΛ࢖͏͜ͱͰΩϟετ΋ෆཁ
47. 5IBOL
    ZPV IUUQTHJUIVCDPN,*.PDL6TFS%FGBVMUT
48. ࢀߟจݙ w μοΫɾλΠϐϯά 8JLJQFEJB 
 IUUQTKBXJLJQFEJBPSHXJLJ &&&"'&##& #'&"&&#& #
    w JEܕͱ͸ಈత݁߹ͷ֓೦
 IUUQTKQSPHSBNFSDPNPCKFDUJWFD
    w ·ͭ΋ͱ௚఻ɹϓϩάϥϛϯάͷΦΩς
    ୈճʢʣ
 IUUQTUFDIOJLLFJCQDPKQJUBSUJDMF$0-6./ 
49. ʲॏཁͳ஫ҙࣄ߲ʳ
    ɾຊࢿྉ͸ɺஅఆత൑அΛఏڙ͢Δ΋ͷͰ͸ͳ͘ɺ৘ใΛఏڙ͢Δ͜ͱͷΈΛ໨తͱ͓ͯ͠Γɺ͍͔ͳΔछྨ
    ͷ঎඼΋ק༠͢Δ΋ͷͰ͸͋Γ·ͤΜɻ࠷ऴతͳܾఆ͸ɺ͓٬༷ࣗ਎Ͱ൑அ͢Δ΋ͷͱ͠ɺ౰ࣾ͸͜ΕʹҰ੾
    ؔ༩ͤͣɺ·ͨɺҰ੾ͷ੹೚Λෛ͍·ͤΜɻ
    ɾຊࢿྉʹ͸কདྷͷग़དྷࣄʹؔ͢Δ༧૝ؚ͕·Ε͍ͯΔ৔߹͕͋Γ·͕͢ɺͦΕΒ͸༧૝Ͱ͋Γɺ·ͨɺຊࢿ
    ྉͷ಺༰ͷਖ਼֬ੑɺ৴པੑɺ׬શੑɺద࣌ੑ౳ΛҰ੾อূ͢Δ΋ͷͰ͸͋Γ·ͤΜɻຊࢿྉʹج͍ͮͯඃͬͨ
    ͍͔ͳΔଛ֐ʹ͍ͭͯ΋ɺ౰ࣾ͸Ұ੾ͷ੹೚Λෛ͍·ͤΜɻ·ͨɺ౰ࣾ͸ɺ৽͍͠৘ใ΍কདྷͷग़དྷࣄͦͷଞ
    ͷ৘ใʹ͍ͭͯɺߋ৽ຢ͸గਖ਼͢Δٛ຿Λෛ͍·ͤΜɻ
    ɾຊࢿྉΛར༻͢Δ͜ͱʹΑΓ͓٬༷ʹੜͨ͡௚઀తଛ֐ɺؒ઀తଛ֐ɺ೿ੜతଛ֐ͦͷଞ͍͔ͳΔଛ֐ʹͭ
    ͍ͯ΋ɺ౰ࣾ͸Ұ੾ͷ੹೚Λෛ͍·ͤΜɻ
    ঎߸౳ɿ΢ΣϧεφϏגࣜձࣾ
    ۚ༥঎඼औҾۀऀ
    ؔ౦ࡒ຿ہ௕ʢۚ঎ʣୈ߸
    Ճೖڠձɿ೔ຊূ݊ۀڠձ
    Ұൠࣾஂ๏ਓ೔ຊ౤ࢿސ໰ۀڠձ