Achieving Testability in Presentation Layer

Sample code: https://github.com/ishkawa/ios_mvvm_test_example

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19. struct State { var repositories = [] as [Repository] var isLoading = false var cells: [Cell] { if repositories.isEmpty { return [.empty(isLoading: isLoading)] } else { return repositories.map { .repository($0) } } } } enum Cell: Equatable { case empty(isLoading: Bool) case repository(Repository) }
20. struct State { var repositories = [] as [Repository] var isLoading = false var cells: [Cell] { if repositories.isEmpty { return [.empty(isLoading: isLoading)] } else { return repositories.map { .repository($0) } } } } enum Cell: Equatable { case empty(isLoading: Bool) case repository(Repository) } σʔλΛอ࣋͢ΔϓϩύςΟ
21. struct State { var repositories = [] as [Repository] var isLoading = false var cells: [Cell] { if repositories.isEmpty { return [.empty(isLoading: isLoading)] } else { return repositories.map { .repository($0) } } } } enum Cell: Equatable { case empty(isLoading: Bool) case repository(Repository) } ը໘ͷঢ়ଶΛදݱ͢ΔϓϩύςΟ
22. struct State { var repositories = [] as [Repository] var isLoading = false var cells: [Cell] { if repositories.isEmpty { return [.empty(isLoading: isLoading)] } else { return repositories.map { .repository($0) } } } } enum Cell: Equatable { case empty(isLoading: Bool) case repository(Repository) } ը໘ͷঢ়ଶΛදݱ͢ΔϓϩύςΟ ηϧΛදݱ͢Δܕ
23. struct State { var repositories = [] as [Repository] var isLoading = false var cells: [Cell] { if repositories.isEmpty { return [.empty(isLoading: isLoading)] } else { return repositories.map { .repository($0) } } } } enum Cell: Equatable { case empty(isLoading: Bool) case repository(Repository) }
24. struct State { var repositories = [] as [Repository] var isLoading = false var cells: [Cell] { if repositories.isEmpty { return [.empty(isLoading: isLoading)] } else { return repositories.map { .repository($0) } } } } enum Cell: Equatable { case empty(isLoading: Bool) case repository(Repository) }
25. XCTAssertEqual(state.cells, [.empty(isLoading: true)])
26. XCTAssertEqual(state.cells, [.empty(isLoading: false)])
27. XCTAssertEqual(state.cells, [ .repository(repository1), .repository(repository2), .repository(repository3), ... ])
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39. let starredIndex = scheduler.createHotObservable([ next(1, 3), next(2, 4), next(3, 5), ])
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43. XCTAssertEqual(cells.events, [ next(0, [ ... .repository(repository4), .repository(repository5), .repository(repository6), ... ]), next(1, [ ... .repository(repository4Starred), .repository(repository5), .repository(repository6), ... ]), next(2, [ ... .repository(repository4Starred), .repository(repository5Starred), .repository(repository6), ... ]), next(3, [ ... .repository(repository4Starred), .repository(repository5Starred), .repository(repository6Starred), ... ]), ])
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45. ґଘΛϓϩτίϧʹͯ͠ελϒԽ͢Δ
46. protocol APIClient { func sendRequest<Request: APIRequest>(_ request: Request) -> Single<Request.Response> } final class AppAPIClient: APIClient {...} final class TestAPIClient: APIClient {...}
47. protocol APIClient { func sendRequest<Request: APIRequest>(_ request: Request) -> Single<Request.Response> } final class AppAPIClient: APIClient {...} final class TestAPIClient: APIClient {...} w ΞϓϦͰ͸ͪ͜ΒΛ࢖͏
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48. protocol APIClient { func sendRequest<Request: APIRequest>(_ request: Request) -> Single<Request.Response> } final class AppAPIClient: APIClient {...} final class TestAPIClient: APIClient {...} w ςετͰ͸ͪ͜ΒΛ࢖͏
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50. final class TestAPIClient: APIClient { private var stubs = [] as [(request: Any, response: Any)] func stub<Request: APIRequest>(request: Request, response: Single<Request.Response>) { stubs.append((request: request, response: response)) } func sendRequest<Request: APIRequest>(_ request: Request) -> Single<Request.Response> { if let index = stubs.firstIndex(where: { ($0.request as? Request) == request }) { let stub = stubs.remove(at: index) return stub.response as! Single<Request.Response> } else { return Single.error(RxError.unknown) } } }
51. final class TestAPIClient: APIClient { private var stubs = [] as [(request: Any, response: Any)] func stub<Request: APIRequest>(request: Request, response: Single<Request.Response>) { stubs.append((request: request, response: response)) } func sendRequest<Request: APIRequest>(_ request: Request) -> Single<Request.Response> { if let index = stubs.firstIndex(where: { ($0.request as? Request) == request }) { let stub = stubs.remove(at: index) return stub.response as! Single<Request.Response> } else { return Single.error(RxError.unknown) } } } ελϒԽ͢ΔϦΫΤετͱ
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52. final class TestAPIClient: APIClient { private var stubs = [] as [(request: Any, response: Any)] func stub<Request: APIRequest>(request: Request, response: Single<Request.Response>) { stubs.append((request: request, response: response)) } func sendRequest<Request: APIRequest>(_ request: Request) -> Single<Request.Response> { if let index = stubs.firstIndex(where: { ($0.request as? Request) == request }) { let stub = stubs.remove(at: index) return stub.response as! Single<Request.Response> } else { return Single.error(RxError.unknown) } } } ϦΫΤετ͕དྷͨ࣌ʹελϒͱ
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53. let apiClient = TestAPIClient() apiClient.stub( request: ListRepositoriesRequest(), response: Single .just(ListRepositoriesResponse(repositories: [])) .delay(5, scheduler: scheduler)) let viewController = RepositoriesViewController(apiClient: apiClient)
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