public void GivenHotSource_AndHotExpansions_ExpandDistinctBehaves()
{
var testScheduler = new PredictableTestScheduler();
var observer = testScheduler.Start(
() => testScheduler.CreateHotObservable(CreateOnNext(10).At(10), CreateOnNext(16).At(20), CreateOnCompleted <int>().At(22))
.ExpandDistinct(x => x > 0
? testScheduler.CreateHotObservable(CreateOnNext(x / 2).At(testScheduler.Clock + 2), CreateOnNext(x / 3).At(testScheduler.Clock + 3), CreateOnCompleted <int>().At(testScheduler.Clock + 4))
: Observable.Empty <int>(), testScheduler),
0,
5,
100);
var expected = new[]
{
CreateOnNext(10).At(10),
CreateOnNext(16).At(20),
CreateOnNext(5).At(12),
CreateOnNext(3).At(13),
CreateOnNext(8).At(22),
CreateOnNext(2).At(14),
CreateOnNext(1).At(15),
CreateOnNext(0).At(17),
CreateOnNext(4).At(24),
CreateOnCompleted <int>().At(28)
};
Assert.That(observer.Messages, Is.EquivalentTo(expected));
}
public void GivenImmediateSourceAndSelector_ExpandDistinctProducesAllReturnsImmediatelyAndCompletes()
{
var testScheduler = new PredictableTestScheduler();
var observer = testScheduler.Start(
() => new[] { 10, 15 }.ToObservable().ExpandDistinct(x => x > 0 ? Observable.Return(x / 2) : Observable.Empty <int>(), testScheduler),
10,
20,
30);
var expected = new[]
{
CreateOnNext(10).At(20),
CreateOnNext(5).At(20),
CreateOnNext(2).At(20),
CreateOnNext(1).At(20),
CreateOnNext(0).At(20),
CreateOnNext(15).At(20),
CreateOnNext(7).At(20),
CreateOnNext(3).At(20),
CreateOnCompleted <int>().At(20)
};
Assert.That(observer.Messages, Is.EquivalentTo(expected));
}
public void GivenEmptySource_ThenExpandDistinctCompletesImmediately()
{
var testScheduler = new PredictableTestScheduler();
var observer = testScheduler.Start(
() => Observable.Empty <int>().ExpandDistinct(_ => Observable.Empty <int>(), testScheduler),
10,
20,
30);
var expected = new[]
{
CreateOnCompleted <int>().At(20)
};
Assert.That(observer.Messages, Is.EqualTo(expected));
}
public void GivenSimpleSourceAndEmptySelector_ThenExpandDistinctMatchesSource()
{
var testScheduler = new PredictableTestScheduler();
var observer = testScheduler.Start(
() => new[] { 3, 2, 1 }.ToObservable().ExpandDistinct(_ => Observable.Empty <int>(), testScheduler),
10,
20,
30);
var expected = new[]
{
CreateOnNext(3).At(20),
CreateOnNext(2).At(20),
CreateOnNext(1).At(20),
CreateOnCompleted <int>().At(20)
};
Assert.That(observer.Messages, Is.EqualTo(expected));
}