xcode - 为 RxSwift 编写单元测试

Question

我得到了这个类，我想为其编写测试:

import CoreLocation
import RxCocoa
import RxSwift

struct LocationManager {

    private (set) var authorized: Driver<Bool>
    private let coreLocationManager = CLLocationManager()

    init() {
        coreLocationManager.distanceFilter = kCLDistanceFilterNone
        coreLocationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation

        authorized = Observable.deferred { [weak coreLocationManager] in
            let status = CLLocationManager.authorizationStatus()
            guard let coreLocManager = coreLocationManager else {
                return Observable.just(status)
            }
            return coreLocManager
                .rx_didChangeAuthorizationStatus
                .startWith(status)
            }
            .asDriver(onErrorJustReturn: CLAuthorizationStatus.NotDetermined)
            .map {
                switch $0 {
                case .AuthorizedWhenInUse:
                    return true
                default:
                    return false
                }
        }

        coreLocationManager.requestWhenInUseAuthorization()
    }
}

基本上，我想根据可能的 CLAuthorizationStatuses 测试授权的 Driver 是否具有正确的值。我需要正确方向的提示，因为我不熟悉 RxSwift 的单元测试。我想我最好的选择是创建一个 CLLocationManager 的模拟，它在调用 authorizationStatus() 时返回一些 CLAuthorizationStatus ，然后我会检查授权的 Driver 的值 对吗？

感谢任何有关如何测试此 LocationManager 类的解释。

Answer 1

好的，我让它工作了。但是我不确定这是否是一个有效的解决方案。请随时在这里纠正我。

首先，我将我的 LocationManager 类更改为:

import CoreLocation
import RxCocoa
import RxSwift

struct LocationManager<T where T: LocationManagerProtocol> {

    private (set) var authorized: Driver<Bool>
    private let coreLocationManager = CLLocationManager()

    init(type: T.Type) {
        coreLocationManager.distanceFilter = kCLDistanceFilterNone
        coreLocationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation

        authorized = Observable.deferred { [weak coreLocationManager] in
            let status = type.authorizationStatus()
            guard let coreLocManager = coreLocationManager else {
                return Observable.just(status)
            }
            return coreLocManager
                .rx_didChangeAuthorizationStatus
                .startWith(status)
            }
            .asDriver(onErrorJustReturn: CLAuthorizationStatus.NotDetermined)
            .map {
                switch $0 {
                case .AuthorizedWhenInUse:
                    return true
                default:
                    return false
                }
        }

        coreLocationManager.requestWhenInUseAuthorization()
    }
}

现在基本上可以提供符合我编写的新协议(protocol)的类型 LocationManagerProtocol。

接下来，协议(protocol)会实现 authorizationStatus 函数，这样我就可以模拟这个了。

protocol LocationManagerProtocol {
    static func authorizationStatus() -> CLAuthorizationStatus
}

然后我创建了一个CLLocationManager 的扩展 来实现这个协议(protocol):

import CoreLocation

extension CLLocationManager: LocationManagerProtocol {

}

从生产代码调用: let locationManager = LocationManager(type: CLLocationManager.self)

从测试代码调用: let locationManager = LocationManager(type: AuthorizedLocationManager.self) 或 let locationManager = LocationManager(type: ForbiddenLocationManager.self)

在我的测试类中，我添加了这两个类覆盖 authorizationStatus 方法:

class AuthorizedLocationManager: LocationManagerProtocol {
    static func authorizationStatus() -> CLAuthorizationStatus {
        return .AuthorizedWhenInUse
    }
}

class ForbiddenLocationManager: LocationManagerProtocol {
    static func authorizationStatus() -> CLAuthorizationStatus {
        return .Denied
    }
}

我的测试用例:

func testLocationAuthorizationPermitted() {
    let locationManager = LocationManager(type:  AuthorizedLocationManager.self)

    locationManager.authorized
    .driveNext { authorized in
        XCTAssertTrue(authorized)
    }
    .addDisposableTo(disposeBag)
}

func testLocationAuthorizationRejected() {
    let locationManager = LocationManager(type: ForbiddenLocationManager.self)

    locationManager.authorized
        .driveNext { authorized in
            XCTAssertFalse(authorized)
        }
        .addDisposableTo(disposeBag)
}

抱歉发了这么长的帖子。我想我会告诉你我现在是如何解决这个问题的所有信息。然而，正如我之前所说，我对此并不陌生，很想听听有关这种方法的其他意见，以及这是否是一个有效的测试场景。