我最近开始在 Xcode 12.4 版中对基于 SwiftUI 的应用程序运行单元测试。
当我运行测试时，我无法理解输出中实际显示了哪些打印命令，哪些没有。
例如，我有一个用于测试的 MockRepository 类，而不是调用 Firebase 的普通存储库，并且我在 loadData 方法中有两个打印命令。有一段时间，它们都没有出现在输出中。现在我可以使用第一个命令来显示输出（非常一致），但第二个命令没有显示任何内容。
我已尝试在该行添加断点，但仍然没有看到输出。我还从正在测试的实际类中的几个方法中打印出打印命令，但没有从其他辅助方法中打印出来。
是否有一种好方法可以一致地判断哪些打印命令会出现在输出中，哪些不会（用于帮助调试）？
这是我的带有 loadData 函数的模拟存储库：
//
// MockActionRepository.swift
// GoalTogetherTests
//
// Created by Charlie Page on 3/11/21.
//
import Foundation
@testable import GoalTogether
class MockActionRepository: ObservableObject, ActionStoreType {
var db = TestDatabase()
@Published var actions: [Action] = [Action]()
var actionsPublished: Published<[Action]> { _actions }
var actionsPublisher: Published<[Action]>.Publisher { $actions }
init() {
loadData()
}
func loadData() {
let actionsList = db.actionsCollection
self.actions = actionsList
print("Here's a new printout I'm going to print")
print("The actions list third action of: \(self.actions[2].title) has a startDate of \(self.actions[2].startDate)")
}
func addAction(_ action: Action) {
self.actions.append(action)
}
func updateAction(_ action: Action) {
var actionList = self.actions
let index = actionList.firstIndex(where: {$0.id == action.id})
guard index != nil else {
print("Could not find action to update")
return
}
actionList[index!] = action
self.actions = actionList
}
func deleteAction(_ action: Action) {
var actionList = self.actions
if let index = actionList.firstIndex(where: {$0.id == action.id}) {
actionList.remove(at: index)
}
self.actions = actionList
}
}
这里是调用它的测试方法：
//
// ActionListViewModelTests.swift
// GoalTogetherTests
//
// Created by Charlie Page on 3/11/21.
//
import XCTest
@testable import GoalTogether
class ActionListViewModelTests: XCTestCase {
var sut: ActionListViewModel!
override func setUp() {
super.setUp()
sut = ActionListViewModel(actionRepository: MockActionRepository())
}
override func tearDown() {
sut = nil
super.tearDown()
}
func testActionListVM_loadData() {
// given
let count = sut.actionRepository.actions.count
// when
// assert
XCTAssertEqual(count, 3)
}
func testActionListVM_addAction_canAdd() {
// given
let testAction = Action(title: "Test Action specific to the canAdd test.")
// when
sut.addAction(testAction)
// assert
XCTAssertTrue(sut.actionRepository.actions.contains(where: { $0.title == testAction.title}))
}
func testActionListVM_updateAction_canUpdate() {
// given
var updatedAction = sut.actionRepository.actions[0]
// when
updatedAction.title = "New updated action title"
sut.updateAction(updatedAction)
// assert
XCTAssertTrue(sut.actionRepository.actions[0].title == "New updated action title")
}
func testActionListVM_removeAction_canRemove() {
// given
let removalAction = sut.actionRepository.actions[1]
// when
sut.deleteAction(removalAction)
let count = sut.actionRepository.actions.count
XCTAssertEqual(count, 2)
}
func testActionListVM_loadPastActions_hasPastAction() {
// given
let pastCount = sut.previousActionCellViewModels.count
// when
// assert
XCTAssertEqual(pastCount, 1)
}
func testActionListVM_loadBaseDateActions_hasBaseDateAction() {
// given
let currentCount = sut.baseDateActionCellViewModels.count
// when
// assert
XCTAssertEqual(currentCount, 2)
}
}
这是我的输出的第一部分（我选择了“所有输出”），它提取了一些输出，但不是全部：
User ID is: Optional("EHOohLd6jMPuLp7CpxtajvYjj2t2")
The current date of 2021-03-30 22:52:12 +0000 is not the end of the week (2021-04-03 22:52:12 +0000)
Start date is 2021-03-31 05:00:00 +0000 and the end of that week is 2021-04-03 05:00:00 +0000
Test Suite 'All tests' started at 2021-03-30 17:52:12.662
Test Suite 'GoalTogetherTests.xctest' started at 2021-03-30 17:52:12.663
Test Suite 'ActionListViewModelTests' started at 2021-03-30 17:52:12.663
Test Case '-[GoalTogetherTests.ActionListViewModelTests testActionListVM_addAction_canAdd]' started.
Here's a new printout I'm going to print
The current date of 2021-03-30 22:52:25 +0000 is not the end of the week (2021-04-03 22:52:25 +0000)
Start date is 2021-03-31 05:00:00 +0000 and the end of that week is 2021-04-03 05:00:00 +0000
Test Case '-[GoalTogetherTests.ActionListViewModelTests testActionListVM_addAction_canAdd]' passed (12.570 seconds).
Test Case '-[GoalTogetherTests.ActionListViewModelTests testActionListVM_loadBaseDateActions_hasBaseDateAction]' started.
Here's a new printout I'm going to print
The current date of 2021-03-30 22:52:25 +0000 is not the end of the week (2021-04-03 22:52:25 +0000)
Start date is 2021-03-31 05:00:00 +0000 and the end of that week is 2021-04-03 05:00:00 +0000
Test Case '-[GoalTogetherTests.ActionListViewModelTests testActionListVM_loadBaseDateActions_hasBaseDateAction]' passed (0.172 seconds).