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我正在尝试在我的signInAnonyymous() 函数中测试我的捕获。然而，我不断收到标题中指出的错误。

这是我的模拟 Auth 类（为简洁起见进行了编辑）：

class MockFirebaseAuth extends Mock implements FirebaseAuth {
  final bool signedIn;
  final bool isEmployee;

  MockFirebaseAuth({this.isEmployee = false, this.signedIn = false});

  @override
  Future<UserCredential> signInAnonymously() async {
  return MockUserCredential(isAnonymous: true);
  }
}

而且，这是我的测试：

group('Sign-In-Anonymously', () {
setUp(() {
  mockFunctions = MockFirebaseFunctions();
  mockAuth = MockFirebaseAuth();
  mockCrashltyics = MockCrashlytics();
  mockFirestore = MockFirebaseFirestore();
  authRemoteService = AuthServiceFirebase(
    crashlytics: mockCrashltyics,
    firestoreService: mockFirestore,
    functions: mockFunctions,
    service: mockAuth,
  );
  authProvider = AuthProvider(authRemoteService);
});

test(
    'Should return a null AuthUser and non-null errorMessage on exception thrown', …