Testing
Unit testing around a singleton
An app calls AuthManager.shared directly all over the code. How would you unit test the code that depends on this singleton?
final class AuthManager {
static let shared = AuthManager()
private(set) var token: String?
func login(_ id: String) async throws { token = try await API.login(id) }
}How would an interviewer hear this answer? You'll see whether they'd move on, dig in, or say no, and which sentences would trip you up. Your score doesn't change.