何故テストが書けないのか #ios_test_night /why_we_cannot_write_test

2017/12/05(火)DeNAさんで開催されたiOS Test Night #6 - 1周年 - で発表した内容です。

Transcript

1. Կނςετ͕ॻ͚ͳ͍ͷ͔ iOS Test Night #6 1
2. Profile Kazuya Ueoka Timers inc.ͷiOSΤϯδχΞ Twitter: @fromkk Github: fromkk Qiita: fromkk Sarahah: fromkk 2
5. ʊਓਓਓਓਓʊ ʼɹςετ0ɹʻ ʉY^Y^Y^Yʉ 5
6. ςετΛͪΌΜͱ ॻ͔ͳ͍ͱͳʔͱ͸ࢥͬͯ͸͍·ͨ͠ 6
7. ͊͞ɺطଘίʔυʹ ςετΛॻ͜͏ 7
8. ͱࢥͬͯ طଘίʔυΛோΊ·͢ 8
9. ! 9
10. μϝͩɺςετॻ͚ͳ͍ 10
11. Կނͳͷ͔ 11
12. ςετ͕ॻ͚ͳ͍งғؾ • ViewControllerͰ࣮σʔλʹ௚઀ΞΫηε • ຊ൪αʔόʔ/ϩʔΧϧDB/UserDefaults౳ • ίʔυ಺Ͱγϯάϧτϯݺͼग़͠ • ҰͭͷΫϥε͕੹຿Λ͍࣋ͪ͗ͯ͢Δ(અࢠ) • ΠϕϯτϋϯυϦϯά/delegate/Notification/Observation ౳ͷॲཧΛશͯ੥͚ෛ͍ͬͯΔ 12
13. ςετ 0ݸ ͳϓϩδΣΫτʹ ϢχοτςετΛ௥Ճͯ͠Έͨ 13
14. ର৅ͷը໘ 14
15. ࠓճͷςετͷ؍఺ • ը໘ىಈ࣌ʹMarkdownϑΝΠϧΛಡΈࠐΜͰtextViewͷॳ ظ஋ʹઃఆ͞Ε͍ͯΔࣄ • อଘ͍ͨ͠λΠϛϯάͰอଘ͞ΕΔࣄ 15
16. ΍ͬͨࣄ ͦͷ1 16
17. ςετத͸RealmΛInMemoryػೳΛ༗ޮʹ class DB { static var isTesting: Bool = false private static var userConfiguration: Realm.Configuration { return Realm.Configuration() } private static var inMemoryConfiguration: Realm.Configuration { return Realm.Configuration(inMemoryIdentifier: "InMemory") } static var realm: Realm { let configuration: Realm.Configuration if isTesting { configuration = inMemoryConfiguration } else { configuration = userConfiguration } return try! Realm(configuration: configuration) } } 17
18. ΍ͬͨࣄ ͦͷ2 18
19. ʊਓਓਓਓਓਓਓਓਓਓਓʊ ʼɹઃܭͷݟ௚͠ʂʂʂɹʻ ʉY^Y^Y^Y^Y^Y^Y^Y^Y^Yʉ 19
20. ͜Ε·Ͱ 20
21. ݟ௚͠ޙ 21
22. ςετ @testable import Type class RegisterViewControllerTests: XCTestCase { class MockRegistrable: MarkdownRegistrable { let defaultValue = "Hello world" func open(_ completed: @escaping (String) -> ()) { completed(defaultValue) } var isSaved: Bool = false func save(with markdown: String) { isSaved = true } } private func makeViewController() -> RegisterViewController { let registrable = MockRegistrable() let viewController = RegisterViewController() viewController.registrable = registrable return viewController } func testOpen() { let viewController = makeViewController() viewController.open() XCTAssetEqual(registrable.textView.text, "Hello world") } func testSave() { let viewController = makeViewController() viewController.save(with: "hoge huga") XCTAssetTrue(registrable.isSaved) } } 22
23. ςετ͕ॻ͚ͨ 23
24. ςετΛॻ͍ͯݟͯ • ςετ͕ॻ͚Δ͔Ͳ͏͔͸ઃܭ࣍ୈͱ͍͏ࣄ͕਎ʹ͠Έͯ෼ ͔ͬͨ • ϓϩύςΟ͕ࠩ͠ସ͕͑Մೳɾ֎͔Β஋͕౉ͤΔ༷ʹͳͬ ͍ͯΔࣄ͕ॏཁ • (࣮ίʔυͰ͸΋͏গ͠ςετΛॻ͍͕ͨ)؍఺ͷ࿙Εʹؾ෇ ͘ࣄ͕ग़དྷͨ 24
25. ·ͱΊ • ςετෆՄೳΛςετՄೳʹม͑Δࣄ͕ग़དྷ·ͨ͠ • ςετ͕ग़དྷͳ͍࣌͸ઃܭΛݟ௚͢ • ઃܭΛݟ௚ͤ͹ςετ͕ग़དྷΔ • େ෯ʹઃܭΛม͑ͯ΋ςετ͕͋ΔͷͰ҆৺ 25
26. PR 26
30. ΤϯδχΞืूத 30
31. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ 31