public async Task ViewModel_ShouldReturnCorrectValue(
IFixture fixture,
TestSchedulers scheduler)
{
//arrange
const int insertionIndex = 5;
var initialList = fixture.CreateMany<int>(10).ToArray();
var addedList = fixture.CreateMany<int>(10).ToArray();
var expected = initialList.Take(insertionIndex)
.Concat(addedList.Reverse())
.Concat(initialList.Skip(insertionIndex))
.ToArray();
var notifications = scheduler.CreateColdObservable(addedList.Select((i, ii) => OnNext(Subscribed + 1 + ii, i)).ToArray());
var sut = new UpdatableObservableViewModelBuilderOptions<int, int[], int>(
_ => { },
ct => Task.FromResult(initialList),
() => notifications,
scheduler,
scheduler,
scheduler)
.UpdateAction((i, o) => () => o.Insert(insertionIndex, i))
.ToViewModel();
//act
scheduler.Start();
await sut.RefreshAsync();
scheduler.AdvanceBy(Disposed);
var actual = ((IObservableViewModel<ObservableCollection<int>>)sut).CurrentValue;
//assert
actual.ShouldAllBeEquivalentTo(expected);
}
public async Task ViewModel_WhenRefreshed_ShouldDisposePreviousNotificationsSubscriptions(
IFixture fixture,
TestSchedulers scheduler,
int[] values)
{
//arrange
var notifications = scheduler.CreateColdObservable<int>();
var sut = new UpdatableObservableViewModelBuilderOptions<int, int[], int>(
_ => { },
ct => Task.FromResult(values),
() => notifications,
scheduler,
scheduler,
scheduler)
.UpdateAction((i, o) => () => { })
.ToViewModel();
const long disposeTime = 805;
//act
scheduler.Start();
await sut.RefreshAsync();
//we advance to an arbitrary time
scheduler.AdvanceBy(disposeTime);
//the subscription to the new observable should happen here
//the first subscription should be dispose at the current scheduler time
await sut.RefreshAsync();
//assert
notifications.Subscriptions[0].Unsubscribe.Should().Be(disposeTime);
}
public void ViewModel_WhenInitialized_WithRefreshOnCollectionUpdateNotification_ShouldRefresh(
IFixture fixture,
TestSchedulers scheduler,
int[] expectedValue)
{
//arrange
var notifications = scheduler.CreateColdObservable(OnNext(200, 1));
var observer = scheduler.CreateObserver<ObservableViewModelNotification>();
var sut = new UpdatableObservableViewModelBuilderOptions<int, int[], int>(
_ => { },
ct => Task.FromResult(expectedValue),
() => notifications,
scheduler,
scheduler,
scheduler)
.UpdateAction((i, o) => () => { })
.RefreshOnCollectionUpdateNotification()
.ToViewModel();
sut.Subscribe(observer);
//act
scheduler.Start();
//assert
var expected = new ObservableViewModelNotification()
{
Status = ObservableViewModelStatus.Value,
Value = expectedValue
};
observer.Values().Last().Value.As<ObservableCollection<int>>().ShouldAllBeEquivalentTo(expectedValue);
}
public async Task ViewModel_WhenError_WithRefreshOnCollectionUpdateNotification_ShouldRefresh(
IFixture fixture,
TestSchedulers scheduler,
int[] expectedValue)
{
//arrange
var notifications = scheduler.CreateColdObservable(OnNext(200, 1));
var observer = scheduler.CreateObserver<ObservableViewModelNotification>();
var count = 0;
var sut = new UpdatableObservableViewModelBuilderOptions<int, int[], int>(
_ => { },
async ct =>
{
if (++count == 1)
throw new Exception();
else
return expectedValue;
},
() => notifications,
scheduler,
scheduler,
scheduler)
.UpdateAction((i, o) => () => { })
.RefreshOnCollectionUpdateNotification()
.ToViewModel();
sut.Subscribe(observer);
//act
await sut.RefreshAsync();
scheduler.AdvanceBy(300);
//assert
observer.Values().Last().Value.As<ObservableCollection<int>>().ShouldAllBeEquivalentTo(expectedValue);
}