如何解决即使在满足期望后 XCTest 也失败了
我有一个任务聚合器,它以同步方式聚合和执行任务。它是线程安全的等等。这是它的样子
class DaddysMagicalTaskAggregator {
private let tasks: ThreadSafeValueContainer<[KewlTask]>
private let cancelled: ThreadSafeValueContainer<Bool>
private var completion: ((Result<Bool,Error>) -> Void)?
private var alreadyCompleted: Result<Bool,Error>?
private var getTasks: [KewlTask] {
return tasks.value ?? []
}
private var isCancelled: Bool {
return cancelled.value ?? true
}
init(queue: DispatchQueue = DispatchQueue(label: "DaddysMagicalTaskAggregator")) {
self.tasks = ThreadSafeValueContainer(value: [],queue: queue)
self.cancelled = ThreadSafeValueContainer(value: false,queue: queue)
}
/// Add a task to the list of tasks
func addTask(_ task: KewlTask) -> DaddysMagicalTaskAggregator {
self.tasks.value = getTasks + [task]
return self
}
/// Add tasks to the list of tasks
func addTasks(_ tasks: [KewlTask]) -> DaddysMagicalTaskAggregator {
self.tasks.value = getTasks + tasks
return self
}
/// Start executing tasks
@discardableResult
func run() -> DaddysMagicalTaskAggregator {
guard !isCancelled else {
return self
}
guard !getTasks.isEmpty else {
alreadyCompleted = .success(true)
completion?(.success(true))
return self
}
var currentTasks = getTasks
let taskToExecute = currentTasks.removeFirst()
self.tasks.value = currentTasks
taskToExecute.execute { (result) in
switch result {
case .success:
self.run()
case.failure(let error):
self.taskFailed(with: error)
}
}
return self
}
private func taskFailed(with error: Error) {
tasks.value = []
alreadyCompleted = .failure(error)
completion?(.failure(error))
completion = nil
}
/// Add a completion block which executes after all the tasks have executed or upon failing a task.
func onCompletion(_ completion: @escaping (Result<Bool,Error>) -> Void) {
if let result = alreadyCompleted {
completion(result)
} else {
self.completion = completion
}
}
/// Cancel all tasks
func cancelAllTasks(with error: Error) {
cancelled.value = true
taskFailed(with: error)
}
}
public class KewlTask {
private let closure: ((KewlTask) -> Void)
private var completion: ((Result<Bool,Error>) -> Void)?
public init(_ closure: @escaping (KewlTask) -> Void) {
self.closure = closure
}
public func execute(_ completion: @escaping (Result<Bool,Error>) -> Void) {
self.completion = completion
closure(self)
}
/// Task succeeded
func succeeded() {
completion?(.success(true))
}
/// Task failed with given error
func failed(with error: Error) {
completion?(.failure(error))
}
/// Take action based on the result received
func processResult(_ result: Result<Bool,Error>) {
switch result {
case .success:
succeeded()
case .failure(let error):
failed(with: error)
}
}
}
public class ThreadSafeContainer {
fileprivate let queue: DispatchQueue
public init(queue: DispatchQueue) {
self.queue = queue
}
}
public class ThreadSafeValueContainer<T>: ThreadSafeContainer {
private var _value: T
public init(value: T,queue: DispatchQueue) {
self._value = value
super.init(queue: queue)
}
public var value: T? {
get {
return queue.sync { [weak self] in
self?._value
}
}
set(newValue) {
queue.sync { [weak self] in
guard let newValue = newValue else { return }
self?._value = newValue
}
}
}
}
它按预期工作。但是,当我编写测试以确保它解除分配时,即使在满足预期之后,该测试仍会失败。
请看下面的测试代码
import XCTest
class AggregatorTests: XCTestCase {
func testTaskAggregatorShouldDeallocatateUponSuccess() {
class TaskContainer {
let aggregator: CustomKewlAggregator
init(aggregator: CustomKewlAggregator = CustomKewlAggregator()) {
self.aggregator = aggregator
}
}
class CustomKewlAggregator: DaddysMagicalTaskAggregator {
var willDeinit: (() -> Void)?
deinit {
willDeinit?()
}
}
let myExpecation = self.expectation(description: "Task Aggregator should deallocate")
var container: TaskContainer? = TaskContainer()
let t1 = KewlTask { t in
t.succeeded()
}
let t2 = KewlTask {
$0.succeeded()
}
container?.aggregator.willDeinit = {
myExpecation.fulfill()
}
container?.aggregator
.addTasks([t1,t2])
.run()
.onCompletion { (result) in
container = nil
}
waitForExpectations(timeout: 4,handler: nil)
}
}
我添加了断点和一切以确保期望实现代码确实执行。
这似乎不是 xCode 问题,因为我已经在 XCode 11.7、12.1、12.2 和 12.4 上对其进行了测试。
知道这里发生了什么吗?对我来说,它看起来像是 XCTests 中的一个错误。
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