다음 뷰모델의 load()를 테스트한다면 어떤 케이스를 검증하겠습니까?

@MainActor @Observable
final class FeedViewModel {
    enum State { case idle, loading, loaded([Post]), failed(String) }
    private(set) var state: State = .idle
    private let repo: PostRepository
    init(repo: PostRepository) { self.repo = repo }
    func load() async {
        state = .loading
        do { state = .loaded(try await repo.fetch()) }
        catch { state = .failed(error.localizedDescription) }
    }
}