如何解决使用Entwine测试基于领域的发布商时出现意外行为
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
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