public void DisposeElements_disposes_elements()
{
var lbs = new ListBehaviorSubject <MyDisposable>();
var d1 = new MyDisposable();
var d2 = new MyDisposable();
var d3 = new MyDisposable();
var d4 = new MyDisposable();
lbs.OnAdd(d1);
lbs.OnAdd(d2);
lbs.OnAdd(d3);
var list = new List <MyDisposable>();
var sub = lbs.DisposeElements().Subscribe(change => change.Apply(list));
CollectionAssert.AreEqual(new[] { d1, d2, d3 }, list);
Assert.AreEqual(0, d1.DisposeCount);
Assert.AreEqual(0, d2.DisposeCount);
Assert.AreEqual(0, d3.DisposeCount);
Assert.AreEqual(0, d4.DisposeCount);
lbs.OnRemove(1);
CollectionAssert.AreEqual(new [] { d1, d3 }, list);
Assert.AreEqual(0, d1.DisposeCount);
Assert.AreEqual(1, d2.DisposeCount);
Assert.AreEqual(0, d3.DisposeCount);
Assert.AreEqual(0, d4.DisposeCount);
lbs.OnReplace(1, d4);
CollectionAssert.AreEqual(new [] { d1, d4 }, list);
Assert.AreEqual(0, d1.DisposeCount);
Assert.AreEqual(1, d2.DisposeCount);
Assert.AreEqual(1, d3.DisposeCount);
Assert.AreEqual(0, d4.DisposeCount);
lbs.OnClear();
CollectionAssert.AreEqual(new MyDisposable[] { }, list);
Assert.AreEqual(1, d1.DisposeCount);
Assert.AreEqual(1, d2.DisposeCount);
Assert.AreEqual(1, d3.DisposeCount);
Assert.AreEqual(1, d4.DisposeCount);
sub.Dispose();
}