Combineを使ったコードのテストをSchedulerで操る方法とその仕組み

Combine Scheduler iOSDC Japan 2021

iOS & 2 Sansan @kalupas0930 2

Combine ViewModel + Combine combine-schedulers combine-schedulers 3

https://github.com/kalupas226/iOSDC2021SampleApp 4

Search 5

Model Response GitHubRepository.swift / Response body struct GitHubRepository: Decodable, Identifiable, Equatable { { let id: Int let fullName: String "items": [ { "id": 3081286, "full_name": "iOSDC" }, { "id": 3081287, "full_name": "iOSDC2021" }, // ... ] } extension GitHubRepository { private enum CodingKeys: String, CodingKey { case id case fullName = "full_name" } init(from decoder: Decoder) throws { let container = try decoder.container(keyedBy: CodingKeys.self) } id = try container.decode(Int.self, forKey: .id) fullName = try container.decode(String.self, forKey: .fullName) } } struct GitHubRepositoryList: Decodable { let items: [GitHubRepository] } 6

Model API GitHubAPIClient.swift // interface struct GitHubAPIClient { var searchRepository: (String) -> AnyPublisher<GitHubRepositoryList, Never> } // extension GitHubAPIClient { // static GitHubAPIClient `.live` // ex) GitHubListView(viewModel: GitHubViewModel(gitHubAPIClient: .live)) static let live = Self( searchRepository: { searchWord in URLSession.shared.dataTaskPublisher( for: URL(string: "https://api.github.com/search/repositories?q=\(searchWord)")! ) .map { $0.data } .decode(type: GitHubRepositoryList.self, decoder: JSONDecoder()) .replaceError(with: .init(items: [])) // .eraseToAnyPublisher() } ) } 7

ViewModel GitHubViewModel.swift 8

View GitHubListView.swift 9

SearchButton iOSDC2021SampleAppTests.swift 11

SearchButton iOSDC2021SampleAppTests.swift 12

publish values from the main thread GitHubViewModel.swift 14

DispatchQueue.main receive GitHubViewModel.swift 15

iOSDC2021SampleAppTests.swift 17

wait iOSDC2021SampleAppTests.swift 18

GitHubViewModel.swift 20

GitHubViewModel.swift 21

22

iOSDC2021SampleAppTests.swift 24

iOSDC2021SampleAppTests.swift 25

0.3s GitHubViewModel.swift 26

iOSDC2021SampleAppTests.swift 27

wait 28

0.3s 0.33s wait CI 0.33s 29

combine-schedulers 30

combine-schedulers Point-Free Combine Combine Scheduler protocol Scheduler AnyScheduler TestScheduler ImmediateScheduler Animated schedulers FailingScheduler UIScheduler Publishers.Timer 31

combine-schedulers Point-Free Combine Combine Scheduler protocol Scheduler AnyScheduler TestScheduler ImmediateScheduler Animated schedulers FailingScheduler UIScheduler Publishers.Timer 32

schedulers ViewModel combine-

ViewModel GitHubViewModel.swift 34

combine-schedulers Scheduler GitHubViewModel.swift 35

ViewModel GitHubViewModel.swift 36

combine-shcedulers Scheduler GitHubViewModel.swift 37

Preview ViewModel initialize GitHubListView.swift 38

GitHubListView.swift 39

combine-schedulers

iOSDC2021SampleAppTests.swift 42

iOSDC2021SampleAppTests.swift 43

iOSDC2021SampleAppTests.swift 44

TestScheduler iOSDC2021SampleAppTests.swift 45

TestScheduler iOSDC2021SampleAppTests.swift 46

iOSDC2021SampleAppTests.swift 47

iOSDC2021SampleAppTests.swift 48

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combine-schedulers 0.3s 0.33s wait 0.33s 50

combine-schedulers 0.3s 0.33s wait 0.33s 51

combine-schedulers ask the speaker

, 53

operator Combine operator 54

protocol 55

Scheduler Scheduler option Scheduler 56

protocol 57

Scheduler Scheduler 58

protocol 59

3 function 60

Scheduler protocol Scheduler

Apple DispatchQueue ImmediateScheduler RunLoop OperationQueue 62

DispatchQueue 63

Scheduler combine-shcedulers

Test Scheduler Scheduler Test combine-schedulers protocol 2 associatedtype 2 property 3 function interval 65

Test Scheduler Scheduler Test combine-schedulers protocol 2 associatedtype 2 property 3 function interval 66

Scheduler Scheduler MyTestScheduler  typealias 67

Generics associatedtype property Scheduler DispatchQueue ImmediateScheduler RunLoop OperationQueue Scheduler TestScheduler Generics 68

initializer MyTestScheduler.swift 69

1 function MyTestScheduler.swift 1 function 70

MyTestScheduler.swift 71

MyTestScheduler.swift -> schedule 72

MyTestScheduler MyTestScheduler.swift Combine 73

schedule advance iOSDC2021SampleAppTests.swift 74

MyTestScheduler MyTestScheduler.swift 75

DispatchQueue.myTest iOSDC2021SampleAppTests.swift 76

Publisher MyTestScheduler iOSDC2021SampleAppTests.swift 77

2 function MyTestScheduler.swift 2 function 78

MyTestScheduler.swift 79

date MyTestScheduler.swift 80

advance date MyTestScheduler.swift 81

2 function iOSDC2021SampleAppTests.swift 82

(5000s) iOSDC2021SampleAppTests.swift 83

84

3 function MyTestScheduler.swift 3 function interval 85

MyTestScheduler.swift 86

interval 87

MyTestScheduler.scheduled [] s.schedule(after: scheduler.now, interval: 1) [scheduleAction(for: now), now)] s.advance() [scheduleAction(for: now + 1), now + 1)] s.advance(.milliseconds(500)) [scheduleAction(for: now + 1), now + 1)] s.advance(.milliseconds(500)) [scheduleAction(for: now + 2), now + 2)] 88

MyTestScheduler.scheduled [] s.schedule(after: scheduler.now, interval: 1) [scheduleAction(for: now), now)] s.advance() [scheduleAction(for: now + 1), now + 1)] s.advance(.milliseconds(500)) [scheduleAction(for: now + 1), now + 1)] s.advance(.milliseconds(500)) [scheduleAction(for: now + 2), now + 2)] 89

MyTestScheduler.scheduled [] s.schedule(after: scheduler.now, interval: 1) [scheduleAction(for: now), now)] s.advance() [scheduleAction(for: now + 1), now + 1)] s.advance(.milliseconds(500)) [scheduleAction(for: now + 1), now + 1)] s.advance(.milliseconds(500)) [scheduleAction(for: now + 2), now + 2)] 90

MyTestScheduler.scheduled [] s.schedule(after: scheduler.now, interval: 1) [scheduleAction(for: now), now)] s.advance() [scheduleAction(for: now + 1), now + 1)] s.advance(.milliseconds(500)) [scheduleAction(for: now + 1), now + 1)] s.advance(.milliseconds(500)) [scheduleAction(for: now + 2), now + 2)] 91

0.5s 1s MyTestScheduler.scheduled [] s.schedule(after: scheduler.now, interval: 1) [scheduleAction(for: now), now)] s.advance() [scheduleAction(for: now + 1), now + 1)] s.advance(.milliseconds(500)) [scheduleAction(for: now + 1), now + 1)] s.advance(.milliseconds(500)) [scheduleAction(for: now + 2), now + 2)] 92

1s MyTestScheduler.scheduled [] s.schedule(after: scheduler.now, interval: 1) [scheduleAction(for: now), now)] s.advance() [scheduleAction(for: now + 1), now + 1)] s.advance(.milliseconds(500)) [scheduleAction(for: now + 1), now + 1)] s.advance(.milliseconds(500)) [scheduleAction(for: now + 2), now + 2)] 93

iOSDC2021SampleAppTests.swift 94

iOSDC2021SampleAppTests.swift 95

interval MyTestScheduler.swift 96

MyTestScheduler.swift 97

interval iOSDC2021SampleAppTests.swift 98

interval iOSDC2021SampleAppTests.swift 99

iOSDC2021SampleAppTests.swift 100

MyTestScheduler.swift 101

MyTestScheduler.swift 102

iOSDC2021SampleAppTests.swift 103

interval iOSDC2021SampleAppTests.swift Date interval schedule function 104

MyTestScheduler.swift 105

1 2 function MyTestScheduler.swift 106

3 function MyTestScheduler.swift 107

iOSDC2021SampleAppTests.swift 108

interval iOSDC2021SampleAppTests.swift 109

interval iOSDC2021SampleAppTests.swift 110

AnyCancellable MyTestScheduler.swift 111

MyTestScheduler.swift 112

iOSDC2021SampleAppTests.swift 113

combine-schedulers

Combine operator , , , … wait wait combine-schedulers combine-schedulers Protocol Scheduler Test animation Generics 115

GitHub pointfreeco / combine-schedulers tcldr / Entwine Point-Free Combine Schedulers: Testing Time Combine Schedulers: Controlling Time Combine Schedulers: Erasing Time Apple Developer Documentation Scheduler 116

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