既存コードをAPI Guidelineに準拠させる

Documentation/ThreadBlock.md

@@ -6,6 +6,9 @@ Sync ver
 ```swift
 static func syncFetchWeather(_ jsonString: String) throws -> String
 ```
+
+このメソッドは、値を返すまでに少し時間がかかります。
+
 [APIの概要](YumemiWeather.md)  
 
 ## 課題

Example/Example/Model/DisasterModel.swift

@@ -20,15 +20,15 @@ class DisasterModelImpl: DisasterModel {
     }
 
     func fetchDisaster(completion: ((String) -> Void)?) {
-        self.fetchDisasterHandler = completion
-        self.yumemiDisaster.fetchDisaster()
+        fetchDisasterHandler = completion
+        yumemiDisaster.fetchDisaster()
     }
 }
 
 extension DisasterModelImpl: YumemiDisasterHandleDelegate {
 
     func handle(disaster: String) {
-        self.fetchDisasterHandler?(disaster)
+        fetchDisasterHandler?(disaster)
     }
 
 }

Example/Example/UI/Weather/WeatherViewController.swift

@@ -30,7 +30,7 @@ class WeatherViewController: UIViewController {
         super.viewDidLoad()
 
         NotificationCenter.default.addObserver(forName: UIApplication.didBecomeActiveNotification, object: nil, queue: nil) { [unowned self] notification in
-            self.loadWeather(notification.object)
+            loadWeather(notification.object)
         }
     }
 
@@ -39,11 +39,11 @@ class WeatherViewController: UIViewController {
     }
 
     @IBAction func dismiss(_ sender: Any) {
-        self.dismiss(animated: true, completion: nil)
+        dismiss(animated: true, completion: nil)
     }
 
     @IBAction func loadWeather(_ sender: Any?) {
-        self.activityIndicator.startAnimating()
+        activityIndicator.startAnimating()
         weatherModel.fetchWeather(at: "tokyo", date: Date()) { result in
             DispatchQueue.main.async {
                 self.activityIndicator.stopAnimating()
@@ -58,9 +58,9 @@ class WeatherViewController: UIViewController {
     func handleWeather(result: Result<Response, WeatherError>) {
         switch result {
         case .success(let response):
-            self.weatherImageView.set(weather: response.weather)
-            self.minTempLabel.text = String(response.minTemp)
-            self.maxTempLabel.text = String(response.maxTemp)
+            weatherImageView.set(weather: response.weather)
+            minTempLabel.text = String(response.minTemp)
+            maxTempLabel.text = String(response.maxTemp)
 
         case .failure(let error):
             let message: String
@@ -79,7 +79,7 @@ class WeatherViewController: UIViewController {
                     print("Close ViewController by \(alertController)")
                 }
             })
-            self.present(alertController, animated: true, completion: nil)
+            present(alertController, animated: true, completion: nil)
         }
     }
 }
@@ -88,14 +88,14 @@ private extension UIImageView {
     func set(weather: Weather) {
         switch weather {
         case .sunny:
-            self.image = R.image.sunny()
-            self.tintColor = R.color.red()
+            image = R.image.sunny()
+            tintColor = R.color.red()
         case .cloudy:
-            self.image = R.image.cloudy()
-            self.tintColor = R.color.gray()
+            image = R.image.cloudy()
+            tintColor = R.color.gray()
         case .rainy:
-            self.image = R.image.rainy()
-            self.tintColor = R.color.blue()
+            image = R.image.rainy()
+            tintColor = R.color.blue()
         }
     }
 }

Example/ExampleTests/WeatherViewControllerTests.swift

@@ -12,66 +12,90 @@ import YumemiWeather
 
 class WeatherViewControllerTests: XCTestCase {
 
-    var weahterViewController: WeatherViewController!
-    var weahterModel: WeatherModelMock!
+    var weatherViewController: WeatherViewController!
+    var weatherModel = WeatherModelMock()
 
     override func setUpWithError() throws {
-        weahterModel = WeatherModelMock()
-        weahterViewController = R.storyboard.weather.instantiateInitialViewController()!
-        weahterViewController.weatherModel = weahterModel
-        _ = weahterViewController.view
+        weatherViewController = R.storyboard.weather.instantiateInitialViewController()!
+        weatherViewController.weatherModel = weatherModel
+        weatherViewController.disasterModel = DisasterModelMock()
+
+        weatherViewController.loadViewIfNeeded()
     }
 
     override func tearDownWithError() throws {
         // Put teardown code here. This method is called after the invocation of each test method in the class.
     }
 
-    func test_天気予報がsunnyだったらImageViewのImageにsunnyが設定されること_TintColorがredに設定されること() throws {
-        weahterModel.fetchWeatherImpl = { _ in
-            Response(weather: .sunny, maxTemp: 0, minTemp: 0, date: Date())
+    @MainActor
+    func test_天気予報がsunnyだったらImageViewのImageにsunnyが設定されること_TintColorがredに設定されること() async throws {
+        weatherModel.fetchWeatherImpl = { _ in
+            let response = Response(weather: .sunny, maxTemp: 0, minTemp: 0, date: Date())
+            return Result.success(response)
         }
 
-        weahterViewController.loadWeather()
-        XCTAssertEqual(weahterViewController.weatherImageView.tintColor, R.color.red())
-        XCTAssertEqual(weahterViewController.weatherImageView.image, R.image.sunny())
+        weatherViewController.loadWeather(self)
+        await Task.yield()
+
+        XCTAssertEqual(weatherViewController.weatherImageView.tintColor, R.color.red())
+        XCTAssertEqual(weatherViewController.weatherImageView.image, R.image.sunny())
     }
 
-    func test_天気予報がcloudyだったらImageViewのImageにcloudyが設定されること_TintColorがgrayに設定されること() throws {
-        weahterModel.fetchWeatherImpl = { _ in
-            Response(weather: .cloudy, maxTemp: 0, minTemp: 0, date: Date())
+    @MainActor
+    func test_天気予報がcloudyだったらImageViewのImageにcloudyが設定されること_TintColorがgrayに設定されること() async throws {
+        weatherModel.fetchWeatherImpl = { _ in
+            let response = Response(weather: .cloudy, maxTemp: 0, minTemp: 0, date: Date())
+            return Result.success(response)
         }
 
-        weahterViewController.loadWeather()
-        XCTAssertEqual(weahterViewController.weatherImageView.tintColor, R.color.gray())
-        XCTAssertEqual(weahterViewController.weatherImageView.image, R.image.cloudy())
+        weatherViewController.loadWeather(self)
+        await Task.yield()
+
+        XCTAssertEqual(weatherViewController.weatherImageView.tintColor, R.color.gray())
+        XCTAssertEqual(weatherViewController.weatherImageView.image, R.image.cloudy())
     }
 
-    func test_天気予報がrainyだったらImageViewのImageにrainyが設定されること_TintColorがblueに設定されること() throws {
-        weahterModel.fetchWeatherImpl = { _ in
-            Response(weather: .rainy, maxTemp: 0, minTemp: 0, date: Date())
+    @MainActor
+    func test_天気予報がrainyだったらImageViewのImageにrainyが設定されること_TintColorがblueに設定されること() async throws {
+        weatherModel.fetchWeatherImpl = { _ in
+            let response = Response(weather: .rainy, maxTemp: 0, minTemp: 0, date: Date())
+            return Result.success(response)
         }
 
-        weahterViewController.loadWeather()
-        XCTAssertEqual(weahterViewController.weatherImageView.tintColor, R.color.blue())
-        XCTAssertEqual(weahterViewController.weatherImageView.image, R.image.rainy())
+        weatherViewController.loadWeather(self)
+        await Task.yield()
+
+        XCTAssertEqual(weatherViewController.weatherImageView.tintColor, R.color.blue())
+        XCTAssertEqual(weatherViewController.weatherImageView.image, R.image.rainy())
     }
 
-    func test_最高気温_最低気温がUILabelに設定されること() throws {
-        weahterModel.fetchWeatherImpl = { _ in
-            Response(weather: .rainy, maxTemp: 100, minTemp: -100, date: Date())
+    @MainActor
+    func test_最高気温_最低気温がUILabelに設定されること() async throws {
+        weatherModel.fetchWeatherImpl = { _ in
+            let response = Response(weather: .rainy, maxTemp: 100, minTemp: -100, date: Date())
+            return Result.success(response)
         }
 
-        weahterViewController.loadWeather()
-        XCTAssertEqual(weahterViewController.minTempLabel.text, "-100")
-        XCTAssertEqual(weahterViewController.maxTempLabel.text, "100")
+        weatherViewController.loadWeather(self)
+        await Task.yield()
+
+        XCTAssertEqual(weatherViewController.minTempLabel.text, "-100")
+        XCTAssertEqual(weatherViewController.maxTempLabel.text, "100")
     }
 }
 
 class WeatherModelMock: WeatherModel {
 
-    var fetchWeatherImpl: ((Request) throws -> Response)!
+    var fetchWeatherImpl: ((Request) -> Result<Response, WeatherError>)!
 
-    func fetchWeather(_ request: Request) throws -> Response {
-        return try fetchWeatherImpl(request)
+    func fetchWeather(at area: String, date: Date, completion: @escaping (Result<Response, WeatherError>) -> Void) {
+        completion(fetchWeatherImpl(Request(area: area, date: date)))
+    }
+}
+
+final class DisasterModelMock: DisasterModel {
+
+    func fetchDisaster(completion: ((String) -> Void)?) {
+        completion?("只今、災害情報はありません。")
     }
 }

Sources/YumemiWeather/ControllableGenerator.swift

@@ -0,0 +1,56 @@
+//
+//  ControllableGenerator.swift
+//
+//
+//  Created by 古宮 伸久 on 2022/04/08.
+//
+
+import Foundation
+
+/// 制御可能な乱数生成器です。
+struct ControllableGenerator {
+
+    /// 唯一のインスタンスを生成します。
+    ///
+    /// このイニシャライザーは、複数回呼び出しても意味がありません。
+    /// 乱数生成方法の都合で、同じ振る舞いをするインスタンスになります。
+    private init() {
+    }
+}
+
+extension ControllableGenerator {
+
+    /// 唯一の、制御可能な乱数生成器インスタンスです。
+    static var shared = ControllableGenerator()
+
+    /// 乱数生成時に使用するシード値を `seed` でリセットします。
+    /// - Parameter seed: 新たに使用するシード値です。
+    static func reset(withSeed seed: Int) {
+        srand48(seed)
+    }
+
+    /// 乱数生成時に使用するシード値を `area` と `date` から算出してリセットします。
+    /// - Parameters:
+    ///   - area: シード値の算出に使う、地域情報
+    ///   - date: シード値の算出に使う、日付情報
+    static func resetUsing(area: Area, date: Date) {
+
+        var hasher = Hasher()
+
+        hasher.combine(area)
+        hasher.combine(date)
+
+        let seed = hasher.finalize()
+
+        reset(withSeed: seed)
+    }
+}
+
+extension ControllableGenerator : RandomNumberGenerator {
+
+    /// 次の乱数を生成します。
+    /// - Returns: 次の乱数です。
+    func next() -> UInt64 {
+        UInt64(drand48() * Double(UInt64.max))
+    }
+}

Sources/YumemiWeather/YumemiDisaster.swift

@@ -18,7 +18,7 @@ public class YumemiDisaster {
     public init() {}
 
     public func fetchDisaster() {
-        self.delegate?.handle(disaster: "只今、災害情報はありません。")
+        delegate?.handle(disaster: "只今、災害情報はありません。")
     }
 
 }

Sources/YumemiWeather/YumemiWeather.APIQuality.swift

@@ -0,0 +1,54 @@
+//
+//  YumemiWeather.APIQuality.swift
+//
+//  
+//  Created by Tomohiro Kumagai on 2024/05/02
+//  
+//
+
+extension YumemiWeather {
+
+    /// API の品質を表現します。
+    enum APIQuality {
+        case sometimesFails(probability: Double)
+        case alwaysFails
+        case neverFails
+    }
+}
+
+extension YumemiWeather {
+
+    /// API の想定品質です。
+    static var apiQuality: APIQuality = .sometimesFails(probability: 0.25)
+
+    static func whetherHit(with probability: Double) -> Bool {
+        return (0 ..< probability).contains(.random(in: 0 ..< 1))
+    }
+
+    /// この場所に不安定要素を埋め込みます。
+    ///
+    /// 不安定さの度合いは `apiQuality` に依存します。
+    /// - Throws: YumemiError ここで失敗が生成されると YumemiWeatherError.unknownError が送出されます。
+    static func introduceInstability() throws {
+
+        switch apiQuality {
+
+        case .neverFails:
+            return
+
+        case .sometimesFails(let probability) where !whetherHit(with: probability):
+            return
+
+        case .sometimesFails, .alwaysFails:
+            throw YumemiWeatherError.unknownError
+        }
+    }
+
+    /// この場所に不安定要素を埋め込みます。
+    ///
+    /// 不安定さの度合いは `apiQuality` に依存します。
+    /// - Throws: YumemiError ここで失敗が生成されると YumemiWeatherError.unknownError が送出されます。
+    func introduceInstability() throws {
+        try Self.introduceInstability()
+    }
+}