public void ReloadableWithEditDiff()
{
var reloader = new Subject <Unit>();
int loadCount = 0;
IChangeSet <int> lastChangeSet = null;
Task <IEnumerable <int> > Loader()
{
loadCount++;
return(Task.FromResult(loadCount == 1
? Enumerable.Range(1, 10)
: Enumerable.Range(1, 12)));
}
using (var sut = ChangeSetCreation.ReloadableWithEditDiff(reloader, Loader)
.Do(changes => lastChangeSet = changes)
.AsObservableList())
{
sut.Items.Should().BeEquivalentTo(Enumerable.Range(1, 10));
loadCount.Should().Be(1);
lastChangeSet.Adds.Should().Be(10);
reloader.OnNext(Unit.Default);
sut.Items.Should().BeEquivalentTo(Enumerable.Range(1, 12));
lastChangeSet.Adds.Should().Be(2);
}
}
public void ListFromTask()
{
using (var sut = ChangeSetCreation.FromTask().AsObservableList())
{
sut.Items.Should().BeEquivalentTo(Enumerable.Range(1, 10));
}
}
public void WithRetry()
{
int loadCount = 0;
int failedCount = 0;
Task <IEnumerable <int> > Loader()
{
loadCount++;
if (loadCount < 3)
{
failedCount++;
throw new Exception("Failed");
}
return(Task.FromResult(Enumerable.Range(1, 10)));
}
using (var sut = ChangeSetCreation.FromTask(Loader)
.Retry(3) //in an enterprise app, would probably use a backoff retry strategy
.AsObservableList())
{
sut.Items.Should().BeEquivalentTo(Enumerable.Range(1, 10));
loadCount.Should().Be(3);
failedCount.Should().Be(2);
}
}
public void ListFromObservable()
{
var initial = new BehaviorSubject <IEnumerable <int> >(Enumerable.Range(1, 10));
var subscriptions = new Subject <int>();
using (var sut = ChangeSetCreation.FromObservable(initial, subscriptions).AsObservableList())
{
sut.Items.Should().BeEquivalentTo(Enumerable.Range(1, 10));
subscriptions.OnNext(11);
sut.Items.Should().BeEquivalentTo(Enumerable.Range(1, 11));
}
}
public void Reloadable()
{
var loader = new Subject <Unit>();
int loadCount = 0;
using (var sut = ChangeSetCreation.Reloadable(loader)
.Do(changes => loadCount++)
.AsObservableList())
{
sut.Items.Should().BeEquivalentTo(Enumerable.Range(1, 10));
loadCount.Should().Be(1);
loader.OnNext(Unit.Default);
sut.Items.Should().BeEquivalentTo(Enumerable.Range(1, 10));
//the count will be 3 rather than 2 because a .Clear() is first called when an observable change set is switched
loadCount.Should().Be(3);
}
}
public void LoadOnceWithRefcount()
{
int loadCount = 0;
Task <IEnumerable <int> > Loader()
{
loadCount++;
return(Task.FromResult(Enumerable.Range(1, 10)));
}
//Ref
var refcountSource = ChangeSetCreation.FromTaskWithRefCount(Loader);
using (var sut1 = refcountSource.AsObservableList())
using (var sut2 = refcountSource.AsObservableList())
{
sut1.Count.Should().Be(10);
sut2.Count.Should().Be(10);
}
loadCount.Should().Be(1);
using (var sut1 = refcountSource.AsObservableList())
using (var sut2 = refcountSource.AsObservableList())
using (var sut3 = refcountSource.AsObservableList())
using (var sut4 = refcountSource.AsObservableList())
using (var sut5 = refcountSource.AsObservableList())
{
sut1.Count.Should().Be(10);
sut2.Count.Should().Be(10);
sut3.Count.Should().Be(10);
sut4.Count.Should().Be(10);
sut5.Count.Should().Be(10);
}
loadCount.Should().Be(2);
}