public async Task SetsTheEmailFieldWhenInvalidCredentialsAreProvided()
{
arrangeCallToPasswordManagerWithInvalidCredentials();
var observer = TestScheduler.CreateObserver <string>();
ViewModel.Email.Subscribe(observer);
await ViewModel.StartPasswordManager();
TestScheduler.Start();
observer.Messages.AssertEqual(
ReactiveTest.OnNext(1, Email.Empty.ToString()),
ReactiveTest.OnNext(2, InvalidEmail.ToString())
);
}