问题描述
我正在为一个使用中间件的持久性中间件进行修改，该应用程序使用类似Redux的架构，并以Realm作为后端。来自数据库查询的结果应由Combine Publisher发布。
尽管Realm现在支持Combine并提供FrozenCollection类型来管理线程和与并发相关的错误，但建议我使用DTO（结构）使事情尽可能可预测。我编写了一个测试，该测试利用Entwine来确保将Realm FrozenCollection转换为DTO的行为符合预期，但是TestableSubscriber实际上应该接收三个输入时，它在时间索引0处接收到一个空数组（t =时的初始空数组） 0，在t = 100时包含3个元素的测试集，在t = 200时，包含3个元素的第二个测试集）。
我已恢复使用Expectation进行测试，并使用print（）调试Publisher，并获得了预期的输出（总共发出了6个元素，转换为DTO正常工作），所以我假设我在做发生了什么错误，虽然我猜可能是外面的错误，但是还是有错误？
当前使用的是Xcode12，iOS14。代码如下：
中间件（SUT）
import Foundation
import Combine
import RealmSwift
final class PersistenceMiddleware {
private var cancellables = Set<AnyCancellable>()
private var subject = CurrentValueSubject<[Todo.DTO],Never>([])
func allTodos(in realm: Realm = try! Realm()) -> AnyPublisher<[Todo.DTO],Never> {
realm.objects(Todo.self)
.collectionPublisher
// .print()
.assertNoFailure()
.freeze()
.map { item in
item.map { $0.convertToDTO() }
}
// .print()
.receive(on: dispatchQueue.main)
.subscribe(subject)
.store(in: &cancellables)
return subject.erasetoAnyPublisher()
}
deinit {
print("Deinit")
cancellables = []
}
}
测试类
import XCTest
import Combine
import RealmSwift
import EntwineTest
@testable import SwiftRex_Todo_Persisted
class SwiftRex_Todo_PersistedTests: XCTestCase {
private var realm: Realm?
private var testSet1: [Todo] {
[
Todo(name: "Mow lawn"),Todo(name: "Wash car"),Todo(name: "Clean windows")
]
}
private var testSet2: [Todo] {
[
Todo(name: "Walk dog"),Todo(name: "Cook dinner"),Todo(name: "Pay bills")
]
}
override func setUpWithError() throws {
// Put setup code here. This method is called before the invocation of each test method in the class.
realm = try! Realm(configuration: Realm.Configuration(inMemoryIdentifier: UUID().uuidString))
}
override func tearDownWithError() throws {
// Put teardown code here. This method is called after the invocation of each test method in the class.
realm = nil
}
func testCorrectNumberOfObjectsstoredInRealm() {
realm!.addForTesting(objects: testSet1)
XCTAssertEqual(realm!.objects(Todo.self).count,3)
realm!.addForTesting(objects: testSet2)
XCTAssertEqual(realm!.objects(Todo.self).count,6)
}
func testMiddlewarePublisherUsingEntwine() {
let middleware = PersistenceMiddleware()
let scheduler = TestScheduler()
let subscriber = scheduler.createTestableSubscriber([Todo.DTO].self,Never.self)
middleware.allTodos(in: self.realm!)
.subscribe(subscriber)
scheduler.schedule(after: 100) { self.realm!.addForTesting(objects: self.testSet1) }
scheduler.schedule(after: 200) { self.realm!.addForTesting(objects: self.testSet2) }
scheduler.resume()
print("\(subscriber.recordedOutput)")
}
func testMiddlewarePublisherUsingExpectation() {
let middleware = PersistenceMiddleware()
var cancellables = Set<AnyCancellable>()
let receivedValues = expectation(description: "received expected number of published objects")
middleware.allTodos(in: realm!)
.sink { result in
if result.count == 6 {
NSLog(result.debugDescription)
receivedValues.fulfill()
}
}
.store(in: &cancellables)
realm!.addForTesting(objects: testSet1)
realm!.addForTesting(objects: testSet2)
waitForExpectations(timeout: 1,handler: nil)
}
}
控制台输出
测试套件``所有测试''始于2020-10-03 15：49：39.166
测试套件'SwiftRex-Todo-PersistedTests.xctest'开始于2020-10-03 15：49：39.167
测试套件'SwiftRex_Todo_PersistedTests'开始于2020-10-03 15：49：39.167
测试案例'-[SwiftRex_Todo_PersistedTests.SwiftRex_Todo_PersistedTests testCorrectNumberOfObjectsstoredInRealm]已启动。
2020-10-03 15：49：39.182753 + 0100 SwiftRex-Todo-Persisted [14502：643475] Realm版本5.4.7现已发布：https://github.com/realm/realm-cocoa/blob/v5.4.7/CHANGELOG.md
2020-10-03 15：49：39.231129 + 0100 SwiftRex-Todo-Persisted [14502：643297] 设置
2020-10-03 15：49：39.232989 + 0100 SwiftRex-Todo-Persisted [14502：643297]拆除 / n
测试用例'-[SwiftRex_Todo_PersistedTests.SwiftRex_Todo_PersistedTests testCorrectNumberOfObjectsstoredInRealm]已通过（0.067秒）。
测试用例'-[SwiftRex_Todo_PersistedTests.SwiftRex_Todo_PersistedTests testMiddlewarePublisherUsingEntwine]已启动。
2020-10-03 15：49：39.262702 + 0100 SwiftRex-Todo-Persisted [14502：643297] 设置
2020-10-03 15：49：39.264956 + 0100 SwiftRex-Todo-Persisted [14502：643474] [] nw_protocol_get_quic_image_block_invoke dlopen libquic失败
TestSequence
解决方法
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