public async Task Once_InvalidToken_ShouldThrowCouldNotParseAuthTokenException() { // Arrange FirebaseDatabase UnauthenticatedDatabase = new FirebaseDatabase(DatabaseUrl, () => Task.FromResult("2K7qdbC2X9nQNRzlqQC14XmsGPR6Y5phUfxC2B5Z")); await FirebaseHelper.UpdateRules("DenyEverything.json"); // Act & Assert Assert.That(async() => await UnauthenticatedDatabase.Ref("People").Once <PeopleMap>(), Throws.Exception.InstanceOf <CouldNotParseAuthTokenException>()); }