public void RegisterPropertyProxyTest()
{
PropertyProxy proxy = new PropertyProxy(() => card.CardId.ToString(),
(value) => card.CardId = long.Parse(value), nameof(Card.CardId), card);
TestChangeValidator changeValidator = new TestChangeValidator();
TestViewModel viewModel = new TestViewModel(navigationManagerMock, apiConnectorMock, changeValidator);
viewModel.CallRegisterPropertyProxy(proxy);
string result = proxy.Validator.Invoke("12", card);
Assert.AreEqual("test", result);
Assert.AreEqual(nameof(CardField.CardId), changeValidator.PropertyName);
Assert.AreEqual("12", changeValidator.NewValue);
Assert.AreSame(card, changeValidator.Entity);
}