我如何模拟iOS中测试的pectractedFetchedResults？

Question

我正在努力工作如何使用协议来表示核心数据类型，sectionFetchedResults使我能够为我的ios swiftui应用添加快照测试。

以下是代码，我尝试使用协议来表示player squeadview 表示代表。

您认为我可以做什么？

import SwiftUI

struct SquadContainerView: View {
    @Environment(\.managedObjectContext) var viewContext
    @SectionedFetchRequest var players: SectionedFetchResults<Int16, Player>
    private let team: Teamable
    
    init(team: Teamable) {
        let predicate =  NSPredicate(format: "%K == %@", #keyPath(Player.team.id), team.id as CVarArg)
        _players = SectionedFetchRequest<Int16, Player>(sectionIdentifier: \.position, sortDescriptors: [SortDescriptor(\.shirtNumber)], predicate: predicate)
        self.team = team
    }
    
    var body: some View {
        SquadView(viewModel: .init(team: team,
                                   playerService: PlayerService(viewContext),
                                   teamService: TeamService(viewContext)),
                  players: players)
    }
}