通信処理を差し替えてみた話

URLProtocolとMethod Swizzlingの話
#potatotips 37

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1. ௨৴ॲཧΛࠩ͠ସ͑ͯΈͨ࿩
2. ࣗݾ঺հ • ాதୡ໵ (@tattn) • Ϡϑʔͷ2016೥৽ଔ
3. Qiitaͱ͔Twitterͱ͔΍ͬͯ·͢ • ։ൃ͕ര଎ʹͳΔSwift༻XcodeϓϥάΠϯΛ·ͱΊͯΈͨ • ࢖͏ͱख์ͤͳ͘ͳΔSwift Extensionू (Swift3൛) @tanakasan2525
4. APIͷϢχοτςετͲ͏ͯ͠·͢ ͔ʁ
5. DIʁ ϥΠϒϥϦʁ
6. MockingjayศརͰ͢ΑͶ
7. Mockingjay https://github.com/kylef/Mockingjay let body = [ "user": "Kyle" ] stub(uri("/{user}/{repository}"), json(body))
8. Ͳ͏͍͏࢓૊ΈͰಈ͍ͯΔΜͩΖ͏ !
9. ௐ΂ͯΈΔͱ
10. URLProtocolͱMethod Swizzling Λ࢖ͬͯ௨৴ॲཧΛࠩ͠ସ͍͑ͯ·͠ ͨ
11. URLProtocol https://developer.apple.com/reference/foundation/urlprotocol αϙʔτ֎ͷϓϩτίϧͰ௨৴͢Δ৔߹΍ ϦΫΤετΛಠࣗͷํ๏Ͱॲཧ͢Δ࣌ʹ࢖͏Ϋϥεɻ
12. Mock༻ͷURLProtocol public class MockURLProtocol: URLProtocol { override open func startLoading() { let jsonString = "{\"mock\": \"data\"}" let json = jsonString.data(using: .utf8)! self.client?.urlProtocol(self, didLoad: json) self.client?.urlProtocolDidFinishLoading(self) } // ͦͷଞϝιου͸লུ }
13. Method SwizzlingͰϞοΫ༻ͷURLProtocol ʹࠩ͠ସ͑ public extension URLSessionConfiguration { public class func setup() { let `default` = class_getClassMethod(URLSessionConfiguration.self, #selector(getter: URLSessionConfiguration.default)) let swizzled = class_getClassMethod(URLSessionConfiguration.self, #selector(getter: URLSessionConfiguration.mock)) method_exchangeImplementations(`default`, swizzled) } private dynamic class var mock: URLSessionConfiguration { let configuration = self.mock configuration.protocolClasses?.insert(MockURLProtocol.self, at: 0) URLProtocol.registerClass(MockURLProtocol.self) return configuration } }
14. ֶ͔ͤͬ͘ΜͩͷͰϥΠϒϥϦԽ͠· ͨ͠ !
15. Replacer https://github.com/tattn/Replacer ௨৴ͷελϒԽ΍Method SwizzlingΛαϙʔτ͢ΔϥΠϒϥϦ
16. Method ChainͰΦϓγϣϯΛઃఆ͠·͢ self.urlStub .url("echo.jsontest.com/[a-z]+/.*") .httpMethod(.post) .json(["test": "data"]) .delay(1.5)
17. QuickͱAlamofireͰͷελϒԽ describe("Quick compatibility test") { it("returns mock data") { let url = "http://echo.jsontest.com/key/value/one/two" var json: [String: String]? Alamofire.request(url, method: .post).responseJSON { response in json = response.result.value as? [String: String] } expect(json?["test"]).toEventually(equal("data")) } }
18. ओͳػೳ • ௨৴ͷελϒԽ • XCTestҎ֎ (Host Application΋ؚΉ) Ͱ΋࢖༻Մೳ • Method Swizzlingͷαϙʔτػೳ ͳͲͰ͢ɻ
19. ྑ͔ͬͨΒ࢖ͬͯΈ͍ͯͩ͘͞ ! (ʁʁ)ʻ ܅͸⭐͕େ޷͖ͳϑϨϯζͳΜͩͶʂ
20. ͋ɺͦ͏͍͑͹ɺɺɺ
21. ࡞͍ͬͯΔ࣌ʹSwiftͷόάʹؾ͕෇͖·ͨ͠ ؀ڥ: Xcode 8.2, Swift 3.0.2
22. άϩʔόϧఆٛ͞Εͨؔ਺ʹϞδϡʔϧ໊Λ෇͚ Δͱɺ@discardableResult͕ਖ਼ৗʹಈ࡞͠ͳ͍
23. ઌఔௐ΂ͯΈΔͱɺमਖ਼͞ΕͨΈ͍ͨͰ͢ ! https://bugs.swift.org/browse/SR-3665 Fix @discardableResult when invoking function with explicit namespace #7201
24. SwiftͷਐԽɾվળ͸ࢭ ·Βͳ͍Ͱ͢Ͷʂ !
25. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝ ·ͨ͠ʂ