public void ReversableFirstOrDefault_SetToExistingItem_Correct()
{
INotifyCollection <string> collection = new NotifyCollection <string>()
{
"a", "b", "c"
};
SetValue(() => collection.FirstOrDefault(), "b");
Assert.AreEqual(3, collection.Count);
Assert.IsTrue(collection.Contains("a"));
Assert.IsTrue(collection.Contains("b"));
Assert.IsTrue(collection.Contains("c"));
}
public void ReversableFirstOrDefault_WithPredicate_SetToExistingItem_Correct()
{
var collection = new NotifyCollection <string>()
{
"a", "b", "c"
};
SetValue(() => collection.FirstOrDefault(s => string.Compare(s, "a") > 0), "b");
Assert.AreEqual(3, collection.Count);
Assert.IsTrue(collection.Contains("a"));
Assert.IsTrue(collection.Contains("b"));
Assert.IsTrue(collection.Contains("c"));
}
public void Contains_ObservableSourceElementAdded_NoUpdateWhenDetached()
{
var update = false;
var coll = new NotifyCollection<int>() { 1, 2, 3 };
var test = Observable.Expression(() => coll.Contains(4));
test.ValueChanged += (o, e) => update = true;
Assert.IsFalse(test.Value);
Assert.IsFalse(update);
test.Detach();
update = false;
coll.Add(4);
Assert.IsFalse(update);
test.Attach();
Assert.IsTrue(update);
Assert.IsTrue(test.Value);
update = false;
coll.Remove(4);
Assert.IsTrue(update);
}
public void Contains_ObservableSourceElementAdded_NoUpdateWhenDetached()
{
var update = false;
var coll = new NotifyCollection <int>()
{
1, 2, 3
};
var test = Observable.Expression(() => coll.Contains(4));
test.ValueChanged += (o, e) => update = true;
Assert.IsFalse(test.Value);
Assert.IsFalse(update);
test.Detach();
update = false;
coll.Add(4);
Assert.IsFalse(update);
test.Attach();
Assert.IsTrue(update);
Assert.IsTrue(test.Value);
update = false;
coll.Remove(4);
Assert.IsTrue(update);
}