public async Task Refresh_SourceIsEmpty_ShouldReturnCorrectValue(
[Frozen] ThrowingTestScheduler scheduler,
[Frozen] IViewModel parent,
ObservableViewModel <object> sut)
{
//arrange
var observer = scheduler.CreateObserver <ObservableViewModelNotification>();
sut.Subscribe(observer);
//act
await sut.RefreshAsync();
//assert
var actual = observer.Values().ToArray();
var expected = new[]
{
new ObservableViewModelNotification()
{
Status = ObservableViewModelStatus.Initialized, Value = null
},
new ObservableViewModelNotification()
{
Status = ObservableViewModelStatus.Updating, Value = null
},
new ObservableViewModelNotification()
{
Status = ObservableViewModelStatus.Empty, Value = null
}
};
actual.ShouldAllBeEquivalentTo(expected);
}
public async Task CurrentValue_SourceYieldErrorThenValue_ShouldReturnCorrectValue(
[Frozen] ThrowingTestScheduler scheduler,
[Frozen] Exception error,
[Frozen] IViewModel parent,
[Frozen] object expected,
ObservableViewModel <object> sut)
{
//arrange
var observer = scheduler.CreateObserver <ObservableViewModelNotification>();
sut.Subscribe(observer);
//act
//first refresh yield an error
await sut.RefreshAsync();
//second refresh yield a value
await sut.RefreshAsync();
//assert
var actual = sut.CurrentValue;
actual.Should().Be(expected);
}
public async Task ChainEmptyPredicate_WhenPredicateReturnsFalse_OvmStateShouldBeValue(
[Frozen] TestSchedulers schedulers,
ObservableViewModel <object> sut)
{
//arrange
Func <object, bool> predicate = o => false;
var observer = schedulers.CreateObserver <ObservableViewModelNotification>();
sut.ChainEmptyPredicate(predicate);
sut.Subscribe(observer);
//act
await sut.RefreshAsync();
//assert
observer.Values().Last().Should().Match <ObservableViewModelNotification>(n => n.Status == ObservableViewModelStatus.Value);
}