我如何 return 此测试中可观察值的下一个值？

Question

我正在开发一个基于以下应用程序的项目：

我正在尝试围绕 BaseCoordinator class 编写单元测试。

我想断言此方法在 class

private func free<T: CoordinatorType>(coordinator: T) {
    childCoordinators[coordinator.identifier] = nil
}

实际上确实从 childCoordinators 字典中释放了协调器。

不过我不确定我该怎么做。我以为我可以简单地创建一个模拟协调器并使用 start 方法 return 东西，但我相信我做错了

我的测试

func test_releases_coordinator_from_child_coordinator_dict() {
    class MockCoordinator: BaseCoordinator<Void> {
        override func start() -> Observable<Void> {
            return .empty()
        }
    }

    let mockCoordinator = MockCoordinator()
    let sut = BaseCoordinator<Void>()

    sut.coordinate(to: mockCoordinator).subscribe().disposed(by: disposeBag)

    XCTAssertEqual(sut.childCoordinators.count, 0)
}

我的基地协调员

   import RxSwift

    /// Base abstract coordinator generic over the return type of the `start` method.
    class BaseCoordinator<ResultType>: CoordinatorType {

        /// Typealias which allows to access a ResultType of the Coordainator by `CoordinatorName.CoordinationResult`.
        typealias CoordinationResult = ResultType

        /// Utility `DisposeBag` used by the subclasses.
        let disposeBag = DisposeBag()

        /// Unique identifier.
        internal let identifier = UUID()

        /// Dictionary of the child coordinators. Every child coordinator should be added
        /// to that dictionary in order to keep it in memory.
        /// Key is an `identifier` of the child coordinator and value is the coordinator itself.
        /// Value type is `Any` because Swift doesn't allow to store generic types in the array.
        private(set) var childCoordinators = [UUID: Any]()

        /// Stores coordinator to the `childCoordinators` dictionary.
        ///
        /// - Parameter coordinator: Child coordinator to store.
        private func store<T: CoordinatorType>(coordinator: T) {
            childCoordinators[coordinator.identifier] = coordinator
        }

        /// Release coordinator from the `childCoordinators` dictionary.
        ///
        /// - Parameter coordinator: Coordinator to release.
        private func free<T: CoordinatorType>(coordinator: T) {
            childCoordinators[coordinator.identifier] = nil
        }

        /// 1. Stores coordinator in a dictionary of child coordinators.
        /// 2. Calls method `start()` on that coordinator.
        /// 3. On the `onNext:` of returning observable of method `start()` removes coordinator from the dictionary.
        ///
        /// - Parameter coordinator: Coordinator to start.
        /// - Returns: Result of `start()` method.
        func coordinate<T: CoordinatorType, U>(to coordinator: T) -> Observable<U> where U == T.CoordinationResult {
            store(coordinator: coordinator)
            return coordinator.start()
                .do(onNext: { [weak self] _ in self?.free(coordinator: coordinator) })
        }

        /// Starts job of the coordinator.
        ///
        /// - Returns: Result of coordinator job.
        func start() -> Observable<ResultType> {
            fatalError("Start method should be implemented.")
        }
    }

Answer 1

您不能使用 .empty 作为您在 MockCoordinator 中的 return 类型。

empty 创建一个 Observable，它不发射任何项目，但不会失败。

您也应该更新模拟以在订阅后发出一个值，例如：

class MockCoordinator: BaseCoordinator<Bool> {
    override func start() -> Observable<Bool> {
        return .of(true)
    }
}

这应该调用以释放您的协调器。

我如何 return 此测试中可观察值的下一个值？

How can I return the next value of an observable in this test?

observable

xctest

swift

rx-swift